Service manual

System Overview 1-83

Figure 1–37 shows the layout of the PCI backplane. All the PCI slots and riser

slots are labeled.

Note that the slot at the far right of the drawing is labeled 0-0/1. In a master

PCI box the slot is occupied by the standard I/O module and PCI slot 0-0 is not

available. In an expansion PCI box, which does not have a standard I/O

module, PCI slot 0-1 is available.

The PCI backplane manager (PBM), resides on the PCI backplane and is

description of the PBM.

The PCI backplane has two jumpers, neither of which is normally installed:

J60

If the flash ROM is corrupt, installing this jumper will force the PBM

into fail-safe loader mode. The jumper station is three pronged and the

installed position is indicated by a silkscreen connection.

J62 For future use.