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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

1159.0. "incompatibility Reps 900TM-90T" by MEOC02::DWYERMICHAEL () Sun Jun 26 1994 23:20

    Hello, 
    
    I have a customer who has just purchased 150 new PC-NIC cards (not
    ours) to implement his new NWork - Hub 900s + Rep900TMs and standalone
    Rep90Ts (DETMR-AZ) with new 90TSs when they become available.
    
    We have found that his NICs do NOT work with the 90T modules, but DO
    with the 900TM modules : the PCs will just not talk (TCP/IP) unless
    they are connected to the 900TMs. Even using simple 3m patch cords to
    the repeater on a desk in front of two PCs, with both the 90T standalone
    or in a hub90.
    
    Are there any differences between the 90Ts and 900TMs ?
    What wil the 90TS be similar to - the 90T or the 900TM ?
    Any suggestions as to what the problem could be ? There doesn't seem to
    be any configurations on the modules that are relevant.
    
    Anyone seen this before?
    
    Thanks
    Michael

T.R	Title	User	Personal Name	Date	Lines
1159.1		NACAD2::HERTZBERG	History: Love it or Leave it!	`Mon Jun 27 1994 10:22`	4
	Not sure why there might be a problem with the 90Ts. I can tell you that the 90Ts and the 900TMs use completely different hardware designs, and that the 90TS will be the same as the 900TM... using the newer design.
1159.2		NACAD::SLAWRENCE		`Tue Jun 28 1994 10:58`	8
	There is a lot of discussion in the ETHERNET conference on problems with various NICs. The DECrepeater90C and 90T seem to be less tolerant of poor clocks on adapters (the repeaters are strict about the spec, not all NICs are). The 900TM is more forgiving. If you're having this problem, you should see short packets working and longer ones failing (the crossover varies).