A-5
Cisco VISM Installation and Configuration Guide
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
AppendixA VISM and VISM-PR Card Clocking Options
Revertive and Nonrevertive Clocking
Revertive and nonrevertive clocking depends upon the processor module back card used and the clocking
source specified. See Table A- 1 to determine if your clocking is revertive or nonrevertive in your
network configuration.
To make a nonrevertive clock source usable after it has failed, you must use the cnfclksrc command to
change that particular clock source, and then use the cnfclksrc command again to configure it back.
Refer to Chapter 5, “CLI Commands,” for more information on CLI commands.
TableA-1 Revertive/Nonrevertive Clocking and PXM Back Card Support
Processor Module
Back Card Using External Clock Using Inband/Service Module Clock
PXM-UI For loss of service: revertive
For bad frequency/drift: nonrevertive
For loss of service: revertive
For bad frequency/drift: nonrevertive
PXM-UI-S3 For loss of service: revertive
For bad frequency/drift: nonrevertive
For loss of service: revertive
For bad frequency/drift: nonrevertive