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Cisco Unified IP Phone 7900 Series

Field Notice: FN - 24054 - Interoperability Issue between Mixed Version IP Phones, Aironet Access Points, and Line Power Switches


Revised November 1, 2005

April 7, 2003


NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.


Products Affected

Product Top Assembly Comments
Part Number
CP-7960G   68-1679-05    
CP-7940G   68-1735-05    
WS-X4148-RJ45V   68-0965-07    
WS-X6348-RJ-45   68-1376-03   Only affected when using the WS-F6K-VPWR daughter card.  
WS-X6348-RJ45V   68-1750-01    
WS-X6148-RJ-45   68-1922-01   Only affected when using the WS-F6K-VPWR daughter card.  
WS-X6148-RJ45V   68-1869-02    
AIR-AP351E2C   800-13705-06    
AIR-AP351E2R   800-13707-06    
AIR-AP352E2C   800-13706-11    
AIR-AP352E2R   800-13708-09    
AIR-AP352E2R-A-K9   800-19330-06    
AIR-AP352E2R-E-K9   800-19330-06    
AIR-AP352E2R-J-K9   800-19330-06    
AIR-AP352E2R-S-K9   800-19330-02    
AIR-AP1200   800-20361-03    

Problem Description

IP Phones and Aironet Access Points may not be provided inline power. Customers deploying hardware version -05 CP-7940G and CP-7960G Cisco IP Phones within the same network as Cisco IP Phones with previous hardware versions (-04 or prior) and/or Aironet Access Points may experience the failure of an IP Phone or the Aironet Access Point to initialize and receive Ethernet in-line power.

This specific combination does not always result in the failure of the IP Phone to initialize and receive in-line power. Once the IP Phones have been installed and are operational in those ports, this problem will not occur, even if the IP Phones are re-initialized at a later time.

This issue can only occur if the differing hardware versions are connected to vertically adjacent ports* of a line card running in a Catalyst 4000 or 6000 Series Switch. Only Line Cards mentioned in the "Products Affected' section of this document are exposed to this issue.

There is no impact to phones connected to horizontally adjacent ports or to phones or devices in a homogeneouse environment (ie. all -05 version phones or all version -03/-04 Phones combined with Aironet).

*Vertically adjacent ports refers to an odd and even port pair. On the line cards affected, the odd ports are on the top row of the port blade and the even ports are on the bottom row.  

Background

The failure of an IP Phone or Aironet Access Point to initialize and receive Ethernet inline power when connected to the vertically adjacent ports on the same inline power card is caused by an over-current situation in the -05 version Cisco IP Phone. In the scenario in which two affected endpoints are plugged in to a vertically adjacent ports, it is possible that one will not power; or that the second endpoint added will cause the first endpoint to lose power. There is no damage to the switch, phone, or Aironet Access Point, or any impact to Ethernet functionality of the switch. This will not occur with any other combination of IP Phone hardware version other than the -05 hardware version.  

Problem Symptoms

The Cisco IP Phone or Aironet Access Point may fail to power up when connected to a line card mentioned in the Products Affected section above. This will occur when the line card is providing inline power to the phone and the -05 version phone is plugged in to a vertically adjacent port to the prior version phone or the Cisco Aironet Access Point.  

Workaround/Solution

For customers experiencing this issue on a Catalyst 4000 or 6000 Series switch, the workaround for this issue is to avoid combining the CP-7960G (68-1735-05) or CP-7940G (68-1679-05) versions in vertically adjacent switch ports which contain prior manufacturing versions of the CP-7960/CP-7960G or CP-7940/CP-7940G or the Cisco Aironet AP350 and AP1200 Series Access Points.

In some cases, the line card may shut down the inline power to the port after approximately five minutes. If this occurs, you will see from the show inlinepower command that the admin state has been changed by software to off.

In the following example where port 3/8 inlinepower is shutdown by the software, you will see:

sjcf-11a-sw1> (enable) show port inlinepower 3 
Configured Default Inline Power allocation per port: 7.00 Watts (0.16 Amps @42V) Total inline power drawn by module 3: 63.00 Watts ( 1.50 Amps @42V) 
Port InlinePowered PowerAllocated 
Admin Oper Detected mWatt mA @42V 
----- ----- ------ -------- ----- -------- 
3/1 auto on yes 6300 150 
3/2 auto on yes 6300 150 
3/3 auto off no 0 0 
3/4 auto on yes 6300 150 
3/5 auto off no 0 0 
3/6 auto on yes 6300 150 
3/7 auto on yes 6300 150 
3/8 off off no 0 0 
3/9 auto off no 0 0 
3/10 auto off no 0 0 
3/11 auto off no 0 0 
3/12 auto off no 0 0 
3/13 auto on yes 6300 150 
3/14 auto off no 0 0 
3/15 auto on yes 6300 150 
3/16 auto off no 0 0 
3/17 auto off no 0 0 
3/18 auto on yes 6300 150

To re-enable the power, you will need to set the inlinepower Admin state on the line card back to auto using the set port inlinepower 3/8 auto command.

In rare cases, this issue may also result in the port existing in a non-responsive state with the link LED on. In this case, disable and re-enable the port using the following commands:

set port disable [mod/port]

set port enable [mod/port]

Customers may also choose to upgrade their -05 version phones to an -06 version or later using the RMA process.

DDTS

To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.

DDTS Description
CSCea51956( registered customers only)
7940 powering down base on Rev Level

How To Identify Hardware Levels

Hardware version levels are located on the underside of the phone. A bar code label can be found on the left side of the base of the IP Phone. The last two digits of the part number signify the version level of the phone. Affected models are 68-1735-05 Rev.xx (CP-7960G) and 68-1679-05 Rev.xx (CP-7940G) IP Phones. Version levels of -04 or lower are prior phone versions.  

68-1735-06 (CP-7960G) and 68-1679-06 (CP-7940G) and later versions of IP Phones are free of this anomaly.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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