
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Confidential Presentation_ID Kirkpatrick 092509
20
Chassis Power Supply Architecture
The following diagram shows the general power supply architecture for a
single Prisma II XD Platform chassis.
Each AC-to-DC bulk power supply module feeds a separate, dedicated
DC-to-DC converter assembly. The chassis ships with two DC-to-DC
converters installed, but without either AC-to-DC bulk power supply
module installed.
Each DC-to-DC converter can power a full chassis on its own. The use of
dual independent converters, together with dual AC-to-DC bulk power
supplies, allows for full power supply redundancy.
DC-to-DC
Converter
Module B
-48 VDC
RETURN
DC-to-DC
Converter
Module A
AC-to-DC
Bulk Supply
Module A
AC-to-DC
Bulk Supply
Module B
+24 VDC
+5 VDC
-5 VDC
-48 VDC
RETURN
DC
IN/OUT
B
Application Module Power Bus
0 VDC
AC
IN B
DC
IN/OUT
A
AC
IN A
TP552
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