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Cisco VCO/4K Open Programmable Switches

Field Notice: VCO ý Deleting One ICC Span Causes Voice Path Problems


July 26, 2000



Products Affected

Product

Top Assembly

Printed Circuit Assembly

Comments

HW Rev

Part Number

Rev

Part Number

Rev

VCO-ICC=

800-07150-01

-A0

73-4986-01

-A0

ASY, ELMECH, VCO4K, ICC

V5.0.0-V5.0.0.26

VCO-ICC=

800-07150-01

-A1

73-4986-01

-A0

ASY, ELMECH, VCO4K, ICC

V5.1.0-V5.1.0.24

Problem Description

After you delete an Interface Controller Card (ICC) span from a database, the deleted span will continue to transmit on the timeslots assigned to it. This problem also occurs when you add another ICC span to the database. The Generic Call Control (GCC) software assigns the recently configured span the same timeslots used by the deleted ICC I/O span. This causes both ICC spans to transmit on the same timeslots.

Background

The VCO GCC software dynamically assigns timeslots as physical cards are added to the database. Normally, these timeslots are removed when the physical cards are removed from the database. When the error condition is encountered, the timeslots associated with the ICC are not being reassigned by the GCC software.

Problem Symptoms

No voice path, anomalous noise, or tones are present on calls serviced by timeslots impacted by the transmission of both ICC spans.

Workaround/Solution

Taking the entire ICC out of service after the span has been deleted from the database will prevent this problem from occurring. You can accomplish this by using the System Administration's Card Maintenance menu.

  1. Change the status of the entire ICC (Rack-Level-Slot) to Out Of Service.

    This changes the status of all spans associated with the ICC to Out Of Service.

  2. Change the ICC card status (Rack-Level-Slot) to Active.

    This reboots the ICC and reassigns time slots to the spans.

As an alternate workaround, you could remove the ICC from the VCO backplane and then insert it again. This again boots up the ICC and reassigns timeslots to all spans. Refer to the VCO/4K Card Technical Descriptions for removal and replacement procedures.

A software resolution to this problem will be integrated in version 5.1.1.

DDTS

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DDTS

Description

CSCdm90533 (registered customers only)

Deleting one span from ICC causes voice path problems.

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: