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VISM and VISM-PR Card Clocking Options
An MGX 8000 Series platform, consisting of PXM and VISM cards, should have one primary clocking
source. To avoid conflicts and to ensure proper operation, it is important that the settings for clocking
options in both card types are considered together. You must use one of the following primary clocking
source options, which are supported by the VISM/PXM interface:
•
•
•
PXM1 Card as Primary Clocking Source
Figure A-1
the PXM side of the VISM/PXM interface.
Figure A-1
VISM lines configured
for local clocking
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
PXM1, PXM1E, and PXM45 cards—Provides clocking for all VISM cards in the chassis.
A VISM card—Provides clocking for the PXM1, which then provides clocking to the entire chassis.
A VISM-PR card—Provides clocking for the PXM1E or PXM45 card, which then provides clocking
to the entire chassis.
shows the PXM card primary clocking source option in which the clock source originates at
VISM Configured for Local Clocking
Clocking on
T1/E1 lines to
PBX or CO
Bus
VISM
A P P E N D I X
MGX 8850
External BITS (T1/E1)
Network (OC3)
Internal crystal
Cisco VISM Installation and Configuration Guide
A
A-1
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