Specifications

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Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Chapter 2 Configuring General Switch Features
Configuring Clock Sources
Note When using an external clock source and redundant PXM45 cards, use a Y-cable to connect that clock
source to the same clock port on both PXM45 cards. Otherwise, the clock source is available to only one
of the PXM45 cards.
Release 3 of the MGX switches supports two forms of network clock source configuration:
• manual
• NCDP
Both types of network clock configuration are described in the sections that follow.
Note When NCDP is enabled, your manual configuration is disabled, and vice versa. When you disable NCDP,
your node reverts back to any manual clock configuration that was previously done on the node. If you
re-enable NCDP after disabling it, your switch will remember your last NCDP configuration and use that
unless you change it.
Figure 2-2 BITS Clock Source Ports on PXM45-UI-S3 Back Card
PXM
UI-S3
C
P
M
P
A
L
1
N
L
2
N
A
L
A
A
R
M
46143
c
L
K
1
c
L
K
2
port 35
port 36