IBM 1 Series Manual page 60

Processor units
4955 without channel repower card
| A-slot
|
f t 3 . /°
ele
| ' | — Outboard
Powersupply \ POR f
\_unit POR
4955 with channel repower card
A-slot
|
1 ; |R
1 |p| ©
Outboard
POR
Powersupply BBU
Jumper
Unit POR
4952/4953
l ' A-slot
|
[ | Ric
t {iF
1» Outboard
; wo POR
Power supply \ | BBU
\— Unit POR
}
Key.
——
Cc I/O cable and connector showing power-on reset (POR)
~<———-__ Outboard POR(through cable to channel repower card)
5 Channel repowercard
POR = power-on reset
'~BBU =IBM 4999 Battery Backup Unit (optional)
Figure 2-20. Power-on resets as they affect the I/O channel
I/O expansion units
I/O expansion unit 1.
Power
Outboard
POR
Outboard POR Unit POR
I/O expansion unit 2
Outboard
POR
Power supply
Unit POR
po---n- _
I/O expansion unit N
C
|
|
|
|
|
| _ 4
= |
Power supply
:
'Unit POR
Processor I/O Channel 2-49