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Cisco 6100 Series IP DSL Switches

Field Notice: FN - 7811 - Cisco 6100 Series DSLAM Can Experience Transient Errors on DS3

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Revised June 5, 2006
February 2, 2000

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 TAN TAN Rev
6100-SYS-IO-2=
6100-SYS-IO-2  		 6100 System I/O module   -A0  
6100-ST-2-DS3=
6100-ST-2-DS3  		 CISCO6100 DS3 Subtending Module   -A0  
6100-ST-2-IO-DS3=
6100-ST-2-IO-DS3  		 Dual Port DS3 Subtend I/O Module   -A0  
6100-ST-2-IO-DS3=
6100-ST-2-IO-DS3  		 Dual Port DS3 Subtend I/O Module   -B0  
6100-ST-2-IO-DS3=
6100-ST-2-IO-DS3  		 Dual Port DS3 Subtend I/O Module   -B1  

Problem Description

 

 A defect in the 6100-ST-2-IO-DS3= can cause transient DS3 errors to occur.

Background



 Cisco engineering discovered an impedance problem with the Cisco 6100 Subtend I/O card (6100-ST-2-IO-DS3=). This resulted in a small amount of DS3 line errors. Cisco engineering has corrected this issue. The resulting change to the impedance level on the Cisco 6100 Subtend I/O card needs to be matched to both the Cisco 6100 I/O card and the Cisco 6100 Subtend line card. Customers will need to use these cards as a matched set or more DS3 errors will be seen.  

Problem Symptoms

 Line errors may be observed on the DS3 line. This can cause higher layer protocols to retransmit packets. Most users will not observe any slow down in traffic since the DS3 error rate is very small.

Workaround/Solution

The problem has no workaround. Cisco engineering has developed a revised Subtending I/O board that corrects this defect. An upgrade program was made available to resolve this issue. The upgrade replacement program has expired.

Note: Due to an impedance mismatch between the new Subtending I/O card and both the existing System I/O and Subtending cards, all three cards must be upgraded as a set. Cisco has developed revised System I/O and Subtending cards to match the impedance of the new subtending I/O card.

Customers who are not using subtending need to replace the System I/O card only; otherwise, all three cards must be replaced with the new versions as shown in the table below.

This table shows the part numbers used to identify the affected and corrected parts:

Description Ordering# Face Plate# Board#
System I/O Card
Affected 6100-SYS-IO-2= 800-05902-01 73-3455-02
Corrected 6100-SYS-IO-3= 800-05891-02 73-3455-04
Subtend I/O
Affected 6100-ST-2-IO-DS3= None Assigned 73-3557-02
Corrected 6100-ST-IO-3-DS3= 800-05892-01 73-3557-03
Subtend module
Affected 6100-ST-2-DS3= 800-04172-02 73-3549-05
Corrected 6100-ST-3-DS3= 800-04172-03 73-3549-07

Upgrade orders were fulfilled with cards at the stated revision or later.

The following items should be noted when interconnecting systems that use these components:

  • The old Subtending I/O card (6100-ST-2-IO-DS3=) is not compatible with the new versions of the Subtending card (6100-ST-3-DS3=) and the System I/O card (6100-SYS-IO-3=).

  • The new Subtending I/O card (6100-ST-IO-3-DS3=) is not compatible with the old versions of the Subtending card (6100-ST-2-DS3=) and the System I/O card (6100-SYS-IO-2=).

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.