Conference netcad::hub_mgnt

2853.0. "48V power pinouts" by PTOJJD::DANZAK (Pittsburgher �) Thu Oct 12 1995 08:45

    A customer needed 48V info for the hub.  After some research I sent
    'em this.  Hope it's useful....j
    

Amp Part # 748474-1 used to connect to the hub,  
           (mates with the AMP 1-748481-5 on the base hub)
           These are high density mini sub-D with 26 connectors.

Use AWG22 wire to connect!  This is imperative as any other guage will not 
support the current load over an extended period of time:

    Pins 7,8,9 and 16 to +48
    Pins 17,18,24,25,26 to -48

You should use one 48V source and tie all the +48V pins together and all
the -48V pins together.

Do not connect any other pins than the �48 volt pins!  They had other uses 
planned and are interconnected with hub management.  Connecting them could 
damage the hub manager and/or fail the hub!

The exact pinouts are (ignore any non 48V ones for your purposes):

Pin #       Signal Name
-----       -----------  
  1         PM_2 H
  2         PM_1 H
  3         PM_3 H
  4         PM_ALE H
  5         PM_RW H
  6         NO CONNECTION
  7         +48V
  8         +48V
  9         +48V
 10         BBU_REQ L
 11         PM_DS H
 12         PM_4 H
 13         +5V
 14         NO CONNECTION
 15         NO CONNECTION
 16         +48V
 17         48V_RTN (-48V)
 18         48V_RTN (-48V)
 19         BAT_EN H
 20         PM_0 H
 21         PM_5 H
 22         GND
 23         NO CONNECTION
 24         48V_RTN (-48V)
 25         48V_RTN (-48V)
 26         48V_RTN (-48V)