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Conference 7.286::fddi

Title:FDDI - The Next Generation
Moderator:NETCAD::STEFANI
Created:Thu Apr 27 1989
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2259
Total number of notes:8590

1094.0. "Alpha OSF1 detects a DAT failure on Timplex Concentrator32" by TKTVFS::IDO (Naoki Ido, CSC/TOKYO, EWB, DTN 680-2456) Mon Sep 20 1993 21:37

The problem is that the Duplicate Address Test failure is detected on Alpha 
OSF1 V1.2a (with DEFZA 1.2) if it is pluged into Timplex's Concentrator32. 
This failure makes OSF1 can't set fza0 to RUNNING.

I don't know exactly how OSF1 execute DAT when new protocol is initiated but
I believe that it is done by SMT NIF request and responce protocol.
In trace data below, DEFZA broadcasted a NIF_request with Transaction ID=1 
when the DEFZA was trying to join the ring. However, a NIF_responce from Timplex
said that the DEFZA's address was duplicated to his UNA. Again, I don't know
how OSF1 detects DAT failure but Does such NIF_responce causes a DAT failure?

I have another question. On the SMT protocol, Timplex seems to me response for
the NIF_Request from defza with an information based on NIF_request previously 
received. Does this Timplex violate on Neighbor Nortification protocol in 
SMT atandard?

Regards,
Naoki 



-------------------------------- in case of DAT failure ---------------------
IFG=102 15:15:13 823 774 640 E=0 A=1 C=1 FCS=83D606EF Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          FFFFFFFFFFFF
   Source Address            Unknown          1000D46CF370
MAC   4F FF FF FF FF FF FF 10 00 D4 6C F3 70 
    NIF                      Request          Ver=1
     Transaction ID          00000001
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 02 00 01 00 00 00 01 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 00 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=104 15:15:13 826 176 960 E=0 A=1 C=1 FCS=E6A16D23 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 00 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=109 15:15:13 828 723 680 E=0 A=1 C=1 FCS=0E64B494 Len=79
41 SMT           Info                Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          00009B2060F0
MAC   41 10 00 D4 6C F3 70 00 00 9B 20 60 F0 
    NIF                      Response         Ver=1
     Transaction ID          00000001
     Station ID              544C00009B2060F0
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D46CF370
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                   32
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My UNA Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 1 
         val: 0 (FSC-Type0)
SMT   01 03 00 01 00 00 00 01 54 4C 00 00 9B 20 60 F0 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 6C F3 70 00 02 00 04 01 01 02 20 
      00 03 00 04 00 00 30 02 20 0B 00 08 00 00 00 01 00 00 00 01 
------------------------------------------------------------



T.RTitleUserPersonal
Name
DateLines
1094.1more analysis...TKTVFS::IDONaoki Ido, CSC/TOKYO, EWB, DTN 680-2456Tue Sep 21 1993 06:351153
I checked another trace on DAT failure, and found one thing seems to be
the cause of DAT failure. The trace was taken at downstream of TimeLAN100. 
Looking at a NIF response(transactionID=1) frame from TimeplexConcentrator32, 
it set the address match bit to 1. If Alpha received NIF resonse with A=1 
then it recongnizes that a Duplicated address exsists on the ring.
In addition, TimeplexConcentrator32 seems to be wrong because it always set
A=1 when it repeates frames even if DA of the frames doesn't match his 
individual address.
There is only one frame with A=0 in the trace. It is also a NIF response but
it is from TimeLAN100. This means TimeLAN100 works properly. So 
Concentrator32 looks like bad.

One question, Does Alpha(or DEFZA itself) check at A bit on NIF response when 
it execute DAT?  

Naoki


				+----------+
				| ChamLAN  |
	00009B2060B8		+----+-----+		1000D468B1CB
	+----------+		     |			+----------+
	| TimeLAN  |-----------------+----------------- |   DEC    |
	|   100    |					|  DEFCN   |
	+----------+	-----------> frame flow		+----------+
	     |                                               |
             |                                               |
             |                                               |
	+----------+					+----------+
	| Timeplex |            <---------- frame flow  |   DEC    |
	|Concent32 |-----------------------------------	|  Alpha   |
	+----------+					+----------+
	00009B2060F0					1000D46CF370


IFG=103 15:56:40 683 783 760 E=0 A=1 C=1 FCS=83D606EF Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          FFFFFFFFFFFF
   Source Address            Unknown          1000D46CF370
MAC   4F FF FF FF FF FF FF 10 00 D4 6C F3 70 
    NIF                      Request          Ver=1
     Transaction ID          00000001
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 02 00 01 00 00 00 01 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 00 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:40 686 183 120 E=0 A=1 C=1 FCS=E6A16D23 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 00 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=109 15:56:40 690 417 520 E=0 A=1 C=1 FCS=0E64B494 Len=79
41 SMT           Info                Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          00009B2060F0
MAC   41 10 00 D4 6C F3 70 00 00 9B 20 60 F0 
    NIF                      Response         Ver=1
     Transaction ID          00000001
     Station ID              544C00009B2060F0
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D46CF370
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                   32
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My UNA Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 1 
         val: 0 (FSC-Type0)
SMT   01 03 00 01 00 00 00 01 54 4C 00 00 9B 20 60 F0 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 6C F3 70 00 02 00 04 01 01 02 20 
      00 03 00 04 00 00 30 02 20 0B 00 08 00 00 00 01 00 00 00 01 
------------------------------------------------------------
IFG=108 15:56:40 857 232 960 E=0 A=1 C=1 FCS=EEB566B3 Len=95
41 SMT           Info                Asynchronous
   Destination Address       Unknown          800143008008
   Source Address            Unknown          00009B2060F0
MAC   41 80 01 43 00 80 08 00 00 9B 20 60 F0 
    SRF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0067C52F
     Station ID              544C00009B2060F0
     SMT Information Field Length=56
      Parameter Type: Time Stamp  Length=8
        MsgTimeStamp:           680068.71 microsec
      1034 id: fddiSMTTransitionTimeStamp (FddiTimeStamp) (INTEGER) len: 8 
         Time Stamp: 680052.00
      208F id: (fddiMACNeighborChange) (SEQUENCE) len: 28 Index: 35 
        id: Condition (BIT_STRING) val: 1 (DNAChange)
        id: Old-UNA (fddiMACUpstreamNbr) (OCTET_STRING) Address: 08002B168DD3
        id: New-UNA (fddiMACOldUpstreamNbr) (OCTET_STRING) 
         Address: 08002B36CF0E
        id: Old-DNA (fddiMACDownstreamNbr) (OCTET_STRING) 
         Address: 000000000000
        id: New-DNA (fddiMACOldDownstreamNbr) (OCTET_STRING) 
         Address: 000000000000
SMT   07 01 00 01 00 67 C5 2F 54 4C 00 00 9B 20 60 F0 00 00 00 38 
      00 04 00 08 00 00 00 01 FA B0 CF 7E 10 34 00 08 00 00 00 01 
      FA AD A0 10 20 8F 00 1C 00 01 00 23 08 00 2B 16 8D D3 08 00 
      2B 36 CF 0E 00 00 00 00 00 00 00 00 00 00 00 00 
------------------------------------------------------------
IFG=103 15:56:41 503 872 400 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:42 686 303 520 E=0 A=1 C=1 FCS=0E053B26 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 01 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=104 15:56:43 504 761 440 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:44 687 203 840 E=0 A=1 C=1 FCS=0E053B26 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 01 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=104 15:56:45 505 642 400 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:46 688 097 920 E=0 A=1 C=1 FCS=0E053B26 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 01 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:47 506 525 120 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:48 688 988 480 E=0 A=1 C=1 FCS=0E053B26 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 01 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=104 15:56:49 507 411 600 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:49 649 185 920 E=0 A=1 C=1 FCS=765A8066 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          FFFFFFFFFFFF
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F FF FF FF FF FF FF 10 00 D4 68 B1 CB 
    NIF                      Request          Ver=1
     Transaction ID          0000000F
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 02 00 01 00 00 00 0F 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=104 15:56:49 788 332 800 E=0 A=1 C=1 FCS=8DD78914 Len=79
41 SMT           Info                Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            Unknown          1000D46CF370
MAC   41 10 00 D4 68 B1 CB 10 00 D4 6C F3 70 
    NIF                      Response         Ver=1
     Transaction ID          0000000F
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 03 00 01 00 00 00 0F 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=104 15:56:50 690 269 920 E=0 A=1 C=1 FCS=DE109BBB Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          FFFFFFFFFFFF
   Source Address            Unknown          1000D46CF370
MAC   4F FF FF FF FF FF FF 10 00 D4 6C F3 70 
    NIF                      Request          Ver=1
     Transaction ID          00000003
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 02 00 01 00 00 00 03 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=109 15:56:50 696 578 640 E=0 A=1 C=1 FCS=C71A41A2 Len=79
41 SMT           Info                Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          00009B2060F0
MAC   41 10 00 D4 6C F3 70 00 00 9B 20 60 F0 
    NIF                      Response         Ver=1
     Transaction ID          00000003
     Station ID              544C00009B2060F0
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D46CF370
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                   32
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My UNA Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 1 
         val: 0 (FSC-Type0)
SMT   01 03 00 01 00 00 00 03 54 4C 00 00 9B 20 60 F0 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 6C F3 70 00 02 00 04 01 01 02 20 
      00 03 00 04 00 00 30 02 20 0B 00 08 00 00 00 01 00 00 00 01 
------------------------------------------------------------
IFG=104 15:56:50 696 647 440 E=0 A=1 C=1 FCS=72190541 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:51 508 293 360 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=108 15:56:51 941 744 800 E=0 A=1 C=1 FCS=0165337E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          FFFFFFFFFFFF
   Source Address            Unknown          00009B2060F0
MAC   4F FF FF FF FF FF FF 00 00 9B 20 60 F0 
    NIF                      Request          Ver=1
     Transaction ID          0067F070
     Station ID              544C00009B2060F0
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D46CF370
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                   32
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My UNA Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 1 
         val: 0 (FSC-Type0)
SMT   01 02 00 01 00 67 F0 70 54 4C 00 00 9B 20 60 F0 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 6C F3 70 00 02 00 04 01 01 02 20 
      00 03 00 04 00 00 30 02 20 0B 00 08 00 00 00 01 00 00 00 01 
------------------------------------------------------------
IFG=108 15:56:51 942 520 240 E=0 A=0 C=0 FCS=30395E77 Len=79
41 SMT           Info                Asynchronous
   Destination Address       Unknown          00009B2060F0
   Source Address            Unknown          00009B2060B8
MAC   41 00 00 9B 20 60 F0 00 00 9B 20 60 B8 
    NIF                      Response         Ver=1
     Transaction ID          0067F070
     Station ID              4C5400009B2060B8
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060F0
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                2
       Master Count                    0
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 1 
         val: 0 (FSC-Type0)
SMT   01 03 00 01 00 67 F0 70 4C 54 00 00 9B 20 60 B8 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 F0 00 02 00 04 00 01 02 00 
      00 03 00 04 00 00 30 00 20 0B 00 08 00 00 00 01 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:52 690 781 440 E=0 A=1 C=1 FCS=72190541 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:53 509 181 040 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=104 15:56:54 691 682 560 E=0 A=1 C=1 FCS=72190541 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:55 510 062 880 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:56 692 568 000 E=0 A=1 C=1 FCS=72190541 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=104 15:56:57 510 950 800 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:58 693 467 600 E=0 A=1 C=1 FCS=72190541 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=104 15:56:59 511 832 960 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=103 15:56:59 971 961 440 E=0 A=1 C=1 FCS=765A8066 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          FFFFFFFFFFFF
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F FF FF FF FF FF FF 10 00 D4 68 B1 CB 
    NIF                      Request          Ver=1
     Transaction ID          0000000F
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 02 00 01 00 00 00 0F 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=104 15:57:00 073 142 160 E=0 A=1 C=1 FCS=8DD78914 Len=79
41 SMT           Info                Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            Unknown          1000D46CF370
MAC   41 10 00 D4 68 B1 CB 10 00 D4 6C F3 70 
    NIF                      Response         Ver=1
     Transaction ID          0000000F
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 03 00 01 00 00 00 0F 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=104 15:57:00 695 104 800 E=0 A=1 C=1 FCS=E5EDE3CD Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          FFFFFFFFFFFF
   Source Address            Unknown          1000D46CF370
MAC   4F FF FF FF FF FF FF 10 00 D4 6C F3 70 
    NIF                      Request          Ver=1
     Transaction ID          00000004
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 02 00 01 00 00 00 04 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=109 15:57:00 701 898 560 E=0 A=1 C=1 FCS=FCE739D4 Len=79
41 SMT           Info                Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          00009B2060F0
MAC   41 10 00 D4 6C F3 70 00 00 9B 20 60 F0 
    NIF                      Response         Ver=1
     Transaction ID          00000004
     Station ID              544C00009B2060F0
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D46CF370
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                   32
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My UNA Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 1 
         val: 0 (FSC-Type0)
SMT   01 03 00 01 00 00 00 04 54 4C 00 00 9B 20 60 F0 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 6C F3 70 00 02 00 04 01 01 02 20 
      00 03 00 04 00 00 30 02 20 0B 00 08 00 00 00 01 00 00 00 01 
------------------------------------------------------------
IFG=103 15:57:00 702 847 120 E=0 A=1 C=1 FCS=72190541 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=104 15:57:01 512 714 560 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=103 15:57:02 695 255 760 E=0 A=1 C=1 FCS=72190541 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=104 15:57:03 513 602 320 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=104 15:57:04 696 152 560 E=0 A=1 C=1 FCS=72190541 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=103 15:57:05 514 487 600 E=0 A=1 C=1 FCS=2516F62E Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       SUPERNOVA        1000D468B1CB
   Source Address            SUPERNOVA        1000D468B1CB
MAC   4F 10 00 D4 68 B1 CB 10 00 D4 68 B1 CB 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          0000014C
     Station ID              00001000D468B1CB
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060B8
      Parameter Type: Station Descriptor  Length=4
       Node Class           Concentrator
       MAC Count                       1
       Non-Master Count                2
       Master Count                    4
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       My Duplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 7 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 01 4C 00 00 10 00 D4 68 B1 CB 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 B8 00 02 00 04 01 01 02 04 
      00 03 00 04 00 00 30 01 20 0B 00 08 00 00 00 07 00 00 00 01 
------------------------------------------------------------
IFG=109 15:57:05 793 401 680 E=0 A=0 C=0 FCS=D9D11716 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          FFFFFFFFFFFF
   Source Address            Unknown          00009B2060B8
MAC   4F FF FF FF FF FF FF 00 00 9B 20 60 B8 
    NIF                      Request          Ver=1
     Transaction ID          00A3E373
     Station ID              4C5400009B2060B8
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     00009B2060F0
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                2
       Master Count                    0
      Parameter Type: Station State  Length=4
       Rooted Station
       Status Report Frame Support
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 1 
         val: 0 (FSC-Type0)
SMT   01 02 00 01 00 A3 E3 73 4C 54 00 00 9B 20 60 B8 00 00 00 28 
      00 01 00 08 00 00 00 00 9B 20 60 F0 00 02 00 04 00 01 02 00 
      00 03 00 04 00 00 30 00 20 0B 00 08 00 00 00 01 00 00 00 01 
------------------------------------------------------------
IFG=104 15:57:06 697 042 400 E=0 A=1 C=1 FCS=72190541 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D468B1CB
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 68 B1 CB 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 01 03 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------


1094.2KONING::KONINGPaul Koning, A-13683Tue Sep 21 1993 13:1921
What is a TimeLAN100?  Is that a bridge?

Yes, the DEC nodes look at the A indicator when they do duplicate address
test.  That is the essence of the test.  If either the response (sent by
the downstream neighbor in response to the request) or the announcement
(sent by the node doing the test) is received by the node with A=1, that
indicates duplicate address and the test fails.

You should repeat the test while moving the ChameLan to each of the four
possible spots in the ring.  That will tell you which node is setting the 
A indicator.  It could be the concentrator, but it could also be the TimeLAN100.
If the TimeLAN100 is a bridge, I would suspect that one first, since bridges
use promiscuous mode.  Of course that is no excuse for setting the A indicator,
but it may be that an incompetent designer got it wrong.

Once you find the node that is setting the A indicator on the response and
announcement frames, throw it in the nearest trash can!  Seriously, that
node is in severe violation of the FDDI standard and would break ANY node
that correctly executes the duplicate address test, not just DEC nodes.

	paul
1094.3comfirmed itTKTVFS::IDONaoki Ido, CSC/TOKYO, EWB, DTN 680-2456Wed Sep 22 1993 05:46188
Paul,

Yes, TimeLAN100 is a brouter. I had not captured the trace at downstrem 
of the concentrator in the above configuration , but I have had one trace data
on the point to point link between TimeLAN100 and Alpha.

Here is the trace. I put a Chamelan at just behind the TimeLAN100. The A 
indicator is perfectly correct in this case. Of course Alpha had no problem 
then. I told the customer to throw it in the nearest trash can! I love it :-)
          
Naoki

				+-------+
				|ChamLAN|
	00009B2060B8		+---+---+	1000D46CF370
	+-----------+		    |		+-----------+
	|TimeLAN100 |---------------+---------->| Alpha     |
	|           |<------------------------- |           |
	+-----------+                           +-----------+

IFG=8 16:22:17 533 065 120 E=0 A=0 C=0 FCS=08C632BB Len=23
C3 MAC           Claim               Synchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
   Upstream Station TTRT     7.99 ms
MAC   C3 10 00 D4 6C F3 70 10 00 D4 6C F3 70 FF FE 7A 00 
------------------------------------------------------------
IFG=31 16:22:18 050 745 520 E=0 A=0 C=0 FCS=EFAE9C23 Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          FFFFFFFFFFFF
   Source Address            Unknown          1000D46CF370
MAC   4F FF FF FF FF FF FF 10 00 D4 6C F3 70 
    NIF                      Request          Ver=1
     Transaction ID          00000001
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       Rooted Station
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 02 00 01 00 00 00 01 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 11 00 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=37 16:22:18 052 239 920 E=0 A=1 C=1 FCS=35BD83E1 Len=79
41 SMT           Info                Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          00009B2060B8
MAC   41 10 00 D4 6C F3 70 00 00 9B 20 60 B8 
    NIF                      Response         Ver=1
     Transaction ID          00000001
     Station ID              4C5400009B2060B8
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     1000D46CF370
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                2
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       Rooted Station
       Status Report Frame Support
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 1 
         val: 0 (FSC-Type0)
SMT   01 03 00 01 00 00 00 01 4C 54 00 00 9B 20 60 B8 00 00 00 28 
      00 01 00 08 00 00 10 00 D4 6C F3 70 00 02 00 04 00 01 02 00 
      00 03 00 04 00 00 31 00 20 0B 00 08 00 00 00 01 00 00 00 01 
------------------------------------------------------------
IFG=32 16:22:18 055 444 000 E=0 A=0 C=0 FCS=8AD9F7EF Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       Rooted Station
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 11 00 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=36 16:22:18 323 983 360 E=0 A=0 C=0 FCS=F9A1EA20 Len=127
41 SMT           Info                Asynchronous
   Destination Address       Unknown          800143008008
   Source Address            Unknown          00009B2060B8
MAC   41 80 01 43 00 80 08 00 00 9B 20 60 B8 
    SRF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00BAF759
     Station ID              000000009B2060B8
     SMT Information Field Length=88
      Parameter Type: Time Stamp  Length=8
        MsgTimeStamp:           1225301.69 microsec
      1034 id: fddiSMTTransitionTimeStamp (FddiTimeStamp) (INTEGER) len: 8 
         Time Stamp: 1225222.39
      1046 id: (fddiSMTConfigurationChgEvent) (SEQUENCE) len: 0 
SMT   07 01 00 01 00 BA F7 59 00 00 00 00 9B 20 60 B8 00 00 00 58 
      00 04 00 08 00 00 00 03 90 EB C0 92 10 34 00 08 00 00 00 03 
      90 DC A0 80 10 46 00 00 
MAC   2A 10 00 04 00 00 00 05 32 12 00 10 00 00 00 01 00 04 00 03 
      00 04 00 01 00 02 00 02 10 46 00 00 2A 10 00 04 00 00 00 02 
      32 12 00 10 00 00 00 01 00 04 00 03 00 04 00 02 00 02 00 01 
------------------------------------------------------------
IFG=32 16:22:20 047 992 960 E=0 A=0 C=0 FCS=8AD9F7EF Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       Rooted Station
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 11 00 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
IFG=32 16:22:22 048 882 240 E=0 A=0 C=0 FCS=8AD9F7EF Len=79
4F SMT           NSA                 Asynchronous
   Destination Address       Unknown          1000D46CF370
   Source Address            Unknown          1000D46CF370
MAC   4F 10 00 D4 6C F3 70 10 00 D4 6C F3 70 
    NIF                      Announcement     Ver=1
    Invalid Address Type
     Transaction ID          00000002
     Station ID              00001000D46CF370
     SMT Information Field Length=40
      Parameter Type: UNA  Length=8
       UNA     000000000000
      Parameter Type: Station Descriptor  Length=4
       Node Class               Station
       MAC Count                       1
       Non-Master Count                1
       Master Count                    0
      Parameter Type: Station State  Length=4
       Station Wrapped
       Rooted Station
       NoDuplicate
      200B id: fddiMACFrameStatusCapabilities 
       (FddiMACFrameStatusCapabilityType) (BIT_STRING) len: 8 Index: 2 
         val: 0 (FSC-Type0)
SMT   01 01 00 01 00 00 00 02 00 00 10 00 D4 6C F3 70 00 00 00 28 
      00 01 00 08 00 00 00 00 00 00 00 00 00 02 00 04 00 01 01 00 
      00 03 00 04 00 00 11 00 20 0B 00 08 00 00 00 02 00 00 00 01 
------------------------------------------------------------
1094.4KONING::KONINGPaul Koning, A-13683Wed Sep 22 1993 14:2018
Be careful.  That doesn't quite confirm what I said, because now the 
TimeLAN100 is the sender of the NIF Response frame.  In the earlier picture
the concentrator is the sender of the response, and the TimeLAN100 repeats
it.

Apart from that, your latest trace is even more peculiar: you've shown the
response frame (third frame in the trace) with A=1, C=1.  Did you show a
complete trace, or only pieces?  If this is complete, it seems to say that
the response is being transmitted with A=1 and C=1.  That's hard to imagine.
Another possibility is that it's the second arrival of the response -- after
it has gone one complete time around the ring.  In that case, the A/C flags
are set right (since the Alpha has already seen and copied the response), but
that raises the question why the frame hasn't been stripped.

This sure is strange, and it would be valuable to have it studied in some
more detail...

	paul
1094.5Chamlan was located at downstrem AlphaTKTVFS::IDONaoki Ido, CSC/TOKYO, EWB, DTN 680-2456Fri Sep 24 1993 01:3518
I had a mistake. Chamlan was located at downstream Alpha. So the figure should 
be this...
			                  
				         
	00009B2060B8	                 	1000D46CF370
	+-----------+		     		+-----------+
	|TimeLAN100 |-------------------------->| Alpha     |
	|           |<--------------+---------- |           |
	+-----------+               |           +-----------+
				+---+---+
				|ChamLAN|
                    		+---+---+                    

Sorry for that,

PS: Timplex will investigate Concentrator32 on next monday.

naoki
1094.6fixed !?TKTVFS::IDONaoki Ido, CSC/TOKYO, EWB, DTN 680-2456Thu Sep 30 1993 06:018
Well, The distributor of Timplex visited to the customer in monday, and they
confirmed the problem. The problem disappered when they replaced the FDDI 
board in TimeLAN100( yes, not in concentrator.). They brought back the board 
to their office to investigate. I have not yet heard anything from them whether
they could reproduce the problem, but they promised to report the result to 
us.

Naoki