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Cisco WAN Switching Modules

Field Notice: MGX 8800 Jitter Problems on PXM1-4-155 OC-3 Ports


October 11, 1999

Products Affected
Product Description Revision
PXM1-4-155=
800-05086-05  		 ASY,TOP,PXM1B-4-155   -B0  
PXM1-4-155=
PXM1-4-155  		 PXM1, 4 155 Mbps broadband ports (upgrade of PXM1)   -A0  
PXM1-4-155=
PXM1-4-155  		 PXM1, 4 155 Mbps broadband ports (upgrade of PXM1)   -B0  
PXM1-4-155=
PXM1-4-155  		 PXM1, 4 155 Mbps broadband ports (upgrade of PXM1)   -C0  
PXM1-4-155=
PXM1-4-155  		 PXM1, 4 155 Mbps broadband ports (upgrade of PXM1)   -D0  
PXM1-4-155=
800-05086-05  		 ASY,TOP,PXM1B-4-155   -A0  
PXM1-4-155
800-05086-02  		 ASSY TOP PXM1B-4-155-32   -B0  
PXM1-4-155
800-05086-02  		 ASSY TOP PXM1B-4-155-32   -C0  
PXM1-4-155
800-05086-02  		 ASSY TOP PXM1B-4-155-32   -D0  
PXM1-4-155
800-05086-03  		 ASY,TOP,PXM1B-4-155-32   -A0  
PXM1-4-155
800-05086-04  		 ASSY TOP PXM1B-4-155-32   -A0  
PXM1-4-155
800-05086-05  		 ASY,TOP,PXM1B-4-155   -A0  
PXM1-4-155
800-05086-05  		 ASY,TOP,PXM1B-4-155   -B0  
PXM1-4-155=
800-05086-02  		 ASSY TOP PXM1B-4-155-32   -B0  
PXM1-4-155=
800-05086-02  		 ASSY TOP PXM1B-4-155-32   -C0  
PXM1-4-155=
800-05086-02  		 ASSY TOP PXM1B-4-155-32   -D0  
PXM1-4-155=
800-05086-03  		 ASY,TOP,PXM1B-4-155-32   -A0  
PXM1-4-155=
800-05086-04  		 ASSY TOP PXM1B-4-155-32   -A0  

Problem Description



 Cisco has discovered two problems with jitter on the OC-3 Ports of the PXM1-4-155.
  1. Excessive jitter caused by a Programmable Logic Device (PLD) mismatch on the OC-3 daughtercard attached to the PXM1. This affects some units that have part numbers beginning with 800-05086, but there is no way to identify which units are affected. Part numbers beginning with 800-05762 are not affected.
  2. Excessive jitter caused by a software bug when it configures the transmit clock.
 

Background


 This problem was discovered in conformance testing to the GR-253 specification.  

Problem Symptoms


 Cisco has not seen any problems with user traffic.  

Workaround/Solution


 If excessive jitter is a problem in your network, implement both of the solutions below:
  1. Verify that all PXM1-4-155s have a part number beginning with 800-05762.
  2. Install PXM software version 1.1.12.
 

RCN
RCN Description
R99-6424   MSSBU:PXM1B Design Change for 1.1.10 Software Release  

DDTS

This defect has Cisco bug ID CSCdp11982. If you are a registered CCO user and you have logged in, you can view the bug details.

DDTS Description
CSCdp11982

 

 OC3 jitter higher than the normal standards specifications

Upgrade Program


 Field Notice 7931: PXM1-4-155 Upgrade for Excessive Jitter

Complete the form belove to receive the PXM1-4-155 Upgrade for Excessive Jitter. If you have any questions concerning the upgrade program, send e-mail to upgrades-info@cisco.com.

Note: Fields marked with an asterisk (*) in the form below are required fields.

Company Information
*Organization
*Address
Address_line2
*City
*State/Province
*ZIP/Postal Code
Country
Product
Product *Quantity
PXM1-4-155=
Contact Information
*First Name
*Last Name
*Phone 1 Ext.
Fax 1 Ext.
*Internet E-Mail
Please use the following format: user@domain.com
*Upgrade Order Reference Number
Please provide a number that you can use when inquiring about order status
*Serial Numbers of Affected Units 2
1 For phone and fax, include 011 and the country code outside North America.

2 When entering more than one serial number in the serial number text entry field, be sure to type a comma between each serial number to separate them.
 

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) at (800) 553-24HR, (408) 526-7209, or send e-mail to tac@cisco.com.