Conference netcad::hub_mgnt

3828.0. "DS900EF on DEChubONEMX with SMF cards dropping of the link" by GIDDAY::STANISLAUS () Sun Sep 01 1996 23:09

Configuration:    .                               
--------------

	      P2+----------+			+----------+P2 AUI/UTP MAU
	+-------|DS900EF & |			|DS900EF & |--------+
	|	|Standalone|			|Standalone|        |
	|	|Pwr Supply|			|Pwr Supply|        |
	v	|	   |			|	   |        v
      To a 	|	   |	 ~4 Km SMF	|	   |   To a DECHub 900
      DECHub 90	|	   |A------------------B|	   |   with a DR900TM
		|	 P1|	  FDDI Ring	|P1	   |   connecting via
		|	   |B------------------A|	   |   UTP to 4 Unix
		|	   |			|	   |   Systems.
		|	   |			|	   |
		|	   |			|          |AUI/Fibre FL MAU
	 +------|	   |			|	   |------+
	 |    P7|	   |			|	   |P7    |
	 |	+----------+                    +----------+      |
	 |	                                                  |
         |                                                        |
	 v                                                        |
      To a PLC (Programmable Logic                                v
      Controller) Star Coupler going to                        To a PLC
      various PLCs


	Intermittently connections to the Unix Systems from the PLCs are lost.
Obtained LED status from customer on the DS900EF. Fault isolated to the SMF 
link dropping-off. Fault happens several times a day. 

	Asked customer to have only one link between the two DS900EFs. Fault
still happened - doesn't matter which link is used. This says (most likely) the
fibre is not at fault.

	Currently both the DS900EFs are running version 1.5 Firmware. Suggested
customer to upgrade to 1.6.1 or atleast 1.5.2.

	Any other suggestions ?

Alphonse
	

	I did not make it clear in .0 that SMF PMDS are on the DEF1H power
supply. Customer is using SMF. He is not using the MMF PMDs that come mounted
in any DS900EF.

Alphonse

    This is foggy in my DECswitch project days, but if this customer
    is really using DECswitch firmware as old as 1.5.0 (older than
    1.5.2), then I'd say that this is likely the problem. I very vaguely
    recall that there were some bugs/problems associated with the
    use of the 900ef with firmware older than 1.5.2 with a DEF1H.
    So I'd say that there's a good chance that problems will go away
    with more current firmware loaded to the 900ef's.
    
    Bob