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Chapter 1
Overview
Backplane (Fabric)
40
The backplane has two slots for power supply modules. The power supply connector for each slot has a 1-bit
slot address to identify the slot. The address bit for power supply slot 0 is grounded. The address bit for slot 1
is floating on the backplane. The power supply module provides a pull-up resistor on the address line on slot
1. The power supply module uses the slot address bit as bit A0 for generating a unique I2C address for the
FRU ID prom. Figures 1-7 and 1-8 identify and show the location of the backplane power supply modules.
Figure 1-6 Backplane Power Supply Module
Each power supply slot has a power supply modle detect bit used to determine if the power supply module is
inserted into the backplane slot. This bit is routed to an input on the RPM's. The RPM provides a pull-up
resistor for logic 1 when the power supply module is missing. When the power supply module is inserted into
the slot, the bit is grounded by the power supply and logic 0 is detected by the RPM, indicating that the power
supply module is present in the backplane slot.
Figure 1-7 Backplane (Rear View)
Power Supply 0
XBC
Power Supply 1