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Conference netcad::hub_mgnt

Title:DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:NETCAD::COLELLADT
Created:Wed Nov 13 1991
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:4455
Total number of notes:16761

3013.0. "100 or 200Mbps on a backplane dual-ring?" by ZPOVC::HWCHOY (On a foul day, you can complain forever.) Tue Nov 28 1995 02:16

    Hi,
    
    I have a DEChub 900MS with 2 x DECswitch 900EF and 1 x PEswitch 900TX
    forming a dual-ring in the backplane. Do I get 100Mbps or 200Mbps
    bandwidth on the FDDI?
       
    Thanx & Rgds,
    Choy Heng-Wah
T.RTitleUserPersonal
Name		DateLines
3013.1NETCAD::DOODYMichael DoodyTue Nov 28 1995 09:533
    100Mbps.  Not sure why you thought you'd get 200 ?
    
    md
3013.2FFDT on 900EF ???NETRIX::"[email protected]"Robert SchmoelzerTue Nov 28 1995 12:2810
Guys,

Let�s specify the question.
Is a DECswitch 900EF, or PEswitch 900TX or DECconcentrator 900MX
able to use FFDT? 
If yes, in which configuration(eg. 900EF dual attached to only one server?)

thx and rgds
robert
[Posted by WWW Notes gateway]
3013.3Already answered few months agoPRSSOS::PEYRACHEJean-Yves Peyrache Country Support Group FranceTue Nov 28 1995 13:1675


================================================================================
Note 1330.0                  DB900MX and Full Duplex                   4 replies
DPDMAI::DAVIES "Mark, SCA Area Network Consultant"   13 lines   3-MAY-1994 13:51
--------------------------------------------------------------------------------

    
    A simple question, I hope.
    
    1. Does the DECbridge 900MX support Digital Full Duplex mode on the
       FDDI ports.
    
    Thanks,
    
    Mark
    
    
    ** Cross-posted in the HUB_MGMT conference **
    

================================================================================
Note 1330.1                  DB900MX and Full Duplex                      1 of 4
CGOS01::DMARLOWE "Have you been HUBbed lately?"       5 lines   3-MAY-1994 16:56
--------------------------------------------------------------------------------
                                -< Yes and no. >-

    Yup but only if it is connected to 1 device and it supports FDX.
    However a GIGAswitch line card connected to 2 DB900MX's as a ring
    will not operate in FDX mode.
    
    dave

================================================================================
Note 1330.2                  DB900MX and Full Duplex                      2 of 4
KONING::KONING "Paul Koning, B-16504"                 5 lines   3-MAY-1994 18:07
--------------------------------------------------------------------------------

Also note that the max data rate out of the box is 60 Mb/s (6 Ethernet ports).
So full duplex may give you a very small latency benefit, but it cannot give
you a throughput benefit.

	paul

================================================================================
Note 1330.3                  DB900MX and Full Duplex                      3 of 4
DPDMAI::DAVIES "Mark, SCA Area Network Consultant"    8 lines   5-MAY-1994 08:38
--------------------------------------------------------------------------------
                                  -< Thanks. >-

    re: .1   Thanks.
    
    re: .2   Good point.
    
    Regards,
    
    Mark
    

================================================================================
Note 1330.4                  DB900MX and Full Duplex                      4 of 4
QUIVER::PARISEAU "Luc Pariseau"                       9 lines   5-MAY-1994 10:51
--------------------------------------------------------------------------------
                         -< no working in first ship >-


	FDX isn't working in the DB900MX.  This will be stated in the
	release notes.  This is a firmware bug and we hope to fix this
	in the 45 day update.

	But as Paul mentioned, this feature is of very little use in this
	product.

	Luc
3013.4Ok, so is the documentation getting updated?PTOJJD::DANZAKPittsburgher �Tue Nov 28 1995 17:206
    It may have been answered in HERE, but is it getting into the
    DOCUMENTATION so the CUSTOMER can understand it?  Better yet - is it
    also getting into the pre-sales info...?
    
    Yes/no/mebbe?
    j