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Appendix A
VISM and VISM-PR Card Clocking Options
VISM Card as Primary Clocking Source
Figure A-2
at the VISM side of the VISM/PXM interface.
Figure A-2
Clocking on T1/E1
line 1 to
PBX or CO
VISM line #1 configured
for loop clocking, all other
VISM lines (including all
lines on other VISM cards)
configured for local clocking
The VISM card option originates clocking from one of the T1 or E1 lines on one of the VISM cards.
To configure the VISM card as the primary clocking source, complete the following steps:
Use the cnfln command to configure line number 1—the line that is receiving the clocking source—for
Step 1
loop clocking.
Use the cnfln command to configure all remaining T1 or E1 lines on all VISM cards in the chassis for
Step 2
local clocking.
Use the cnfclksrc command to configure the PXM card as a service module clocking source and specify
Step 3
VISM and its clocking line (line number 1) as the clocking source.
Note
The VISM card allows you to configure the clock source on line 1 only. The VISM-PR card does not
have this requirement.
VISM-PR Card as Primary Clocking Source
The VISM-PR card allows you to configure primary clocking from the following sources:
•
•
•
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
shows the VISM card primary clocking source option in which the clock source originates
VISM Configured for Loop Clocking
Bus
VISM
Network clock—the local clock for the PXM1, PXM1E, or PXM45 module
Any VISM-PR T1 or E1 line
On-board oscillator
MGX 8850
Internal crystal
MGX clock source configured for:
Service Module
Cisco VISM Installation and Configuration Guide
VISM Card as Primary Clocking Source
External BITS (T1/E1)
Network (OC3)
A-3
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