[Search for users] [Overall Top Noters] [List of all Conferences] [Download this site]

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

3366.0. "slot dependency for DECswitch900EF?" by SNOFS1::63496::CHIUANDREW () Fri Mar 15 1996 00:18

    HI,
    
    Is there any limitation in putting DECswitch900EF in DEChub900 (I meant
    should we ONLY put DECswitch900EF in slot 8/7/6, but on slot 1)?
    
    
    What about other modules, if there is a limitation for DECswitch900EF?
    
    Customer have a problem where if they put DECswitch900EF (A) in slot 1, the
    DECswitch900EF is not detect from MAM, but another DECswitch900EF (B) in
    slot 8 is detected. In the same HUB, if they put A in slot2/3/4/5, it
    ok (can be detected), but not on slot 1 (they have 4 power supplies in
    that HUB). They also try to put the same DECswitch900EF (A) into
    another DEChub900, they go the same result. 
    
    
    That's why we would like to confirm is there any slot dependency for
    DS900EF?
    
    thanks in advance for help!
    Andrew Chiu 
    Network services sydney
T.RTitleUserPersonal
Name		DateLines
3366.1NETCAD::DRAGONFri Mar 15 1996 08:228
    
    Andrew,
    
    	There is no slot dependency. You might want to try putting 
        DECswitch900EF (B) into slot 1. Maybe there is a problem 
        with DECswitch900EF (A)'s pins (just a guess).
    
    Bob
3366.2NETCAD::DOODYMichael DoodyFri Mar 15 1996 09:263
    Or maybe the Hub needs stiffeners or other hardware ECOs.
    
    md
3366.3My Q's & comments....NETCAD::BATTERSBYFri Mar 15 1996 09:4510
    Andrew, insofar as your customer has told you, is it presumed
    by you that the DECswitch 900EF (A) always powers up ok, passes
    diags, and starts up firmware ok? Has it also been verified by
    customer that slot 1 works flawlessly with other 900 series modules?
    One thing to note (and it's not obvious that this is the cause), but
    I'd thought I'd mention it. That is, that slot 1 will be the first
    slot that loses power when the number of modules inserted in the
    backplane exceed the available power.
    
    Bob
3366.4power to the hub?PTOJJD::DANZAKPittsburgher �Sun Mar 17 1996 20:2614
    It sounds like it could be a hub power issue...
    
    If you don't have enough power supplies in the hub, the hub starts
    powering down full-height modules from left to right.  If the hub
    doesn't have enough power, any modules in the left don't get powerd up.
    
    The advantage to this is that it's a 'known failure mode' so that if
    your hub goes under power, the modules in the right are last to leave.
    So you can design around that to assure that 'critical' modules are
    powered to the last.
    
    If you have another power supply, pop it in and see if ti all pwoers
    up.
    j
3366.5ALBANY::BARTLEYTue Mar 19 1996 08:574
    You might want to check that the micro switch that turns the power
    on for the module is being pushed down far enough by that slot.
    
    Dave
3366.6Will try later!SNOFS1::63496::CHIUANDREWWed Mar 20 1996 17:5010
    Re ALL,
    
    thanks for your input/comment/ideas, It seems to me that there is no
    slot dependency for modules then solve my questions.
    
    Will go to customer today to further test it.
    
    
    Will post result later.
    Andrew
3366.7here are out results?SNOFS1::63496::CHIUANDREWThu Mar 21 1996 17:3223
    Here are our tests!
    
    We swap the EF(8) to Slot 1, it works (we also take that EF in/out mant
    times, it still works), so the DEChub900 BP is ok on slot1. But if put
    the EF1 back to slot 1, it NEVER comes up, but it comes up in
    slot2/3/8. Also we replace a new EF (named as EFx) to EF1 and put in slot1,
    it works in the first time we put in slot1, but if we remove EFx out
    from the BP, then put it back, EFx is not detected. So we put EF8 in
    slot1 and EFx in slot8, everything work, but customer question is WHY
    EFx works in first time, after they pull EFx out from slot1, it NEVER
    works again. 
    
    Anyway, it is working by putting EFx in slot8 and EF8 in slot1. EF1 (I
    think) is NOT faulty, since the result showed us it works as EFx.
    
    May be the contact of micro-switch on EF1 is not good as EF8.
    
    BTW, customer have 4 power supply, 4 PE900TXs and 2 DS900EFs running
    DEchub900 V4.1.1 hw rev F.
    
    welcome for any idea!
    Andrew Chiu 
    Network services Sydney
3366.8ALBANY::BARTLEYFri Mar 22 1996 09:089
    Check the microswitch while it is in the hub to see if is pushed down
    far enough to turn the power on.
    I once had installed a 900EF in a DEChub One and it wouldn't power on.
    I used a small pocket screwdriver to push the switch arm down some more
    and the 900EF came to life. An FCO to the angle of the switch arm cured it.
    
    Good luck,
    
    Dave
3366.9Please clarify what is meant by "never comes up"NETCAD::BATTERSBYDon't use time or words carelessly.Fri Mar 22 1996 09:3718
    Andrew, can you clarify more specifically what you mean by ...
    "it NEVER comes up" ?
    Does it mean.
    
    a. It never powers up (IE: no leds come on).
    
    b. It powers on but doesn't complete self-test (with the result being
       that the mod_ok led is lit).
    
    c. It powers on, passes self test, but is not recognized by the MAM 
       (as indicated by the LCD display).
    
    
    We hear so many variants of phrases like "never comes up" and we
    usually get an improved answer once we ask for clarification or
    ask a few questions.
    
    Bob