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Cisco Catalyst 4500 Series Switches

Field Notice: PWR-C45-1400DC-P Power Supply Does Not Operate Properly in Dual Power Supply Systems in Catalyst WS-C4503 and WS-C4506 Chassis


Revised May 25, 2005
May 13, 2004



Products Affected

Product Top Assembly Printed Circuit Assembly Comments HW Rev.
Part Number Rev. Part Number Rev.
PWR-C45-1400DC-P   341-0044-01   A0   N/A   N/A   This problem affects power supply PWR-C45-1400DC-P only when these conditions are met:

?HW revision is 1.0, and not a part of Deviations D073417 and D073539 builds

?When this power supply is used in WS-C4503 and WS-C4506 chassis with dual-power supplies.

This problem does NOT affect dual power systems in WS-C4507R or WS-C4510 chassis, regardless of HW revisions of this power supply.  
1.0, built outside of Deviations D073417 and D073539  

Problem Description

PWR-C45-1400DC-P power supply may not work properly when used in dual-power systems in WS-C4503 or WS-C4506 chassis, and may cause the supervisors in these systems to reset if one of the power supplies is powered up or shut down.

Background

PWR-C45-1400DC-P power supply is used in four different Catalyst 4500 chassis, namely, WS-C4503, WS-4506, WS-C4507R, and WS-C4510.

Cisco has discovered this power supply with HW revision 1.0 that were not built under Deviations D073417 and D073539 may not work properly in dual-power systems in WS-C4503 or WS-C4506 chassis. The potential for this failure exists when either the primary or redundant power supply is powered up or shut down, thereby creating a supervisor reset. This is due to the current-sharing circuitry design of the power supplies. There are no known issues when both power supplies are on and at steady state.

To determine if a power supply belongs to a deviation builds specified, please refer to section How to Identify Hardware Levels below.

This problem does NOT affect chassis WS-C4507R or WS-C4510 with dual power supplies regardless of the HW version of the power supplies being deployed.

The figure below helps identify the power supplies that are affected by this problem.


 

Problem Symptoms

This problem may cause the supervisors in WS-C4503 and WS-C4506 chassis with dual-power supplies to reset when the primary or redundant power supply is powered up or shut down.  

Workaround/Solution

There is no workaround. In the event that this type of failure is encountered, affected power supplies in the system should be returned to Cisco. To determine which power supply in the dual-power system is the source of this problem, please refer to the Background section above. If both units are affected, as evident from HW revision and deviation information detailed above, then both power supplies should be returned to Cisco.

Affected units can be returned to Cisco via the normal RMA process.

Since there are no known issues when both power supplies are on and at steady state, the requests for replacements should be done when it is convenient to schedule down time.

The fix is incorporated in HW 1.0 that was built under Deviations D073417 and D073539, and in HW version 2.0 onward. This power supply with HW version 1.0 built under these Deviations, and HW version 2.0 and above, is not affected by this problem.

 

How To Identify Hardware Levels

For IOS Systems

To identify Product Number, Part Number, Hardware Revision, and Deviation Number of this power supply, check the command output of the command show idprom power-supply 1 as shown in the examples below. For information on redundant power supply unit, use show idprom power-supply 2.

Example 1: Power Supply with HW Revision 1.0, built under Deviation D073417

Note: if HW revision = 1.0, and there is no Deviation number explicitly stated on "Manufacturing Deviation String" line, then the unit was built outside of the two Deviations mentioned above, and could be affected by this problem. In this example, this unit is not affected since HW revision is 1.0, and was a part of the two "good" deviation builds.

4506#sh idprom power-supply 1
Power Supply 2 Idprom :
Common Block Signature = 0xABAB
Common Block Version = 1
Common Block Length = 144
Common Block Checksum = 4686
Idprom Size = 256
Block Count = 2
FRU Major Type = 0x4501
FRU Minor Type = 3
OEM String = Cisco Systems, Inc.
Product Number = PWR-C45-1400DC-P
Serial Number = ART0724907X
Part Number = 341-0044-01
Part Revision = A0
Manufacturing Deviation String = D073417
Hardware Revision = 1.0
Manufacturing Bits = 0x0000
Engineering Bits = 0x0000
Snmp OID = 0.0.0.0.0.0.0.0
Power Consumption = 1400
RMA Failure Code = 0 0 0 0
Power Supply Block Signature = 0x4501
Power Supply Block Version = 1
Power Supply Block Length = 20
Power Supply Block Checksum = 91
Feature Bits = 0x0000000000000000
Current @ 110V = 0
Current @ 220V = 0
StackMIB OID = 0

Similarly, output of this show command and Deviation-label information are applicable to Deviation D073539.

Deviation information is also posted on a label in a location adjacent to the factory ID label (TOP side of the power supply). The two Deviations numbers, as seen in the red boxes in the example pictures below, indicate the power supply is not affected by this problem.

Information on HW revision of power supply for IOS system can also be taken directly from the label on the power supply. As indicated in the green highlighed area in the Figure 1, the label will read 341-0044-01 if HW revision is 1, and 341-0044-02 if HW revision is 2.





Example 2: Power Supply with HW Revision 2.0

Note: the unit in this example is not affected by this problem since HW revision is 2.0.

4506#sh idprom power-supply 1
Power Supply 2 Idprom:
Common Block Signature = 0xABAB
Common Block Version = 1
Common Block Length = 144
Common Block Checksum = 4686
Idprom Size = 256
Block Count = 2
FRU Major Type = 0x4501
FRU Minor Type = 3
OEM String = Cisco Systems, Inc.
Product Number = PWR-C45-1400DC-P
Serial Number = ART08XXXXXX
Part Number = 341-0044-02
Part Revision = A0
Manufacturing Deviation String =
Hardware Revision = 2.0
Manufacturing Bits = 0x0000
Engineering Bits = 0x0000
Snmp OID = 0.0.0.0.0.0.0.0
Power Consumption = 1400
RMA Failure Code = 0 0 0 0
Power Supply Block Signature = 0x4501
Power Supply Block Version = 1
Power Supply Block Length = 20
Power Supply Block Checksum = 91
Feature Bits = 0x0000000000000000
Current @ 110V = 0
Current @ 220V = 0
StackMIB OID = 0

For CatOS Systems
Information on HW revision of power supply for CatOS system is available directly from the label on the power supply. As indicated in the green highlighed area in the pictures above, the label will read 341-0044-01 if HW revision is 1, and 341-0044-02 if HW revision is 2.

S/N information is located right underneath HW revision on the power supply label. Refer to the figures above.

Similarly, information on Deviation can also be obtained from the label on the power supply. Figure 1 above shows the deviation tag highlighted in red. This power supply built under these two deviations shown in Figure 1 are not affected by this problem.

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