Northern Telecom BCS35 Replacement Manual page 135

Table 13–1
Disk II crossover circuit pack (A15 and B15) options – part number: NT6M72AC, (72–Mbyte
and 140–Mbyte disk drives); NT6M72AD, (72–Mbyte and 140–Mbyte disk drives); NT6M72AE,
(required for 380–Mbyte disk drives w/o 56k polling, DPP systems w/o 56K polling,
compatible with 72–and 140–Mbyte disk drives)
Device type
(number)
Jumper Center pin to A pin
(J5) Center pin to B pin
Strap None used
DIP None used
Switch
Rotary None used
Switch
Switch None used
Notes:
Note 1: Make sure any circuit pack option settings are correct before replacement. Improper performance can be caused by
incorrect settings, and produce faultlike symptoms in the DPP.
Note 2: See Figure 13–1.
Note 3: For circuit packs at A15, make sure jumper J5 is set for selection of the disk drive in the A chassis.
Note 4: For circuit packs at B15, make sure jumper J5 is set for selection of the disk drive in the B chassis.
Position/setting
Disk Crossover and Controller circuit packs 119
Function
Processor A select
Processor B select
DPP Card Replacement Guide BCS35 and up
Setting
Factory On–site
A/B