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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

724.0. "CNX500 config help needed" by VAXRIO::ROLF (Vaporware Design Specialist) Fri Sep 25 1992 15:56

    We need to configure an IBM Token Ring connected to an FDDI Dual Ring.
    The NBG is  at some point suggesting that a DECconc500 is required to
    connect a CNX500 to an FDDI ring.
    
    Could someone confirm that? It doesn't make much sense and I have seen
    mention of connections where the CNX500 is connected directly to the
    FDDI ring.
    
    Also, How do we configure the CNX500? Do we need the DETCE-AA PLUS
    the DETCE-FA? Or is the -AA by itself sufficient?
    
    Also, is there any way to connect the CNX500 to SMF? (Customers wish!)
    
    Thanks for any help!
    
    Rolf
    DEC Brazil
T.RTitleUserPersonal
Name		DateLines
724.1KONING::KONINGPaul Koning, A-13683Fri Sep 25 1992 16:0214
What sort of FDDI station is the CNX?  If a SAS, you can hook it to another
SAS (for a two-node non-expandable network).  You can in principle hook
a SAS to the A or B port of a DAS, but that's not recommended; it acts
like a wrap in the ring and you lose the single-fault recovery that you
normally get with DAS in a dual ring.

If the CNX is a DAS, you can hook it up in all the DAS ways -- in the dual
ring (reasonable for small networks) or to one or two concentrators.  Umm...
if you want to use dual homing, make sure it supports that.  The ability
to do dual-homing is implemented at the A/B port end of a dual-homed setup,
so that's the side where you need to verify that the ability exists, since
it's optional in the standard.

	paul
724.2maybe it's my english...VAXRIO::ROLFVaporware Design SpecialistMon Sep 28 1992 09:1615
    Paul, we are talking about the DETCE-xx, see page 5-50 of the NBG.
    
    After reading thru the description more carefully, it becomes clear that
    one of the -Cx options will include the -AA option, so that part of my
    question is answered.
    
    What is not very clear is the statement on page 5-52:
    
    "Dual attach or single attach (via DECconcentrator500)".
    Can it be the "(via DECconcentrator500)" part of the statement only
    applies to SINGLE ATTACH?
    
    Thanks for the help!
    
    Rolf
724.3KONING::KONINGPaul Koning, A-13683Mon Sep 28 1992 11:557
You're right, that is poorly worded.  The intent is (or should be) for the
concentrator comment to apply only to SAS.  If you read it that way, it
is a valid statement for the common configurations.  Still, note that there
ARE legal configurations for SAS that do not have a concentrator in them.
This SAS is no different from any other SAS.

	paul