Specifications

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Cisco MGX 8800/8900 Series Software Configuration Guide
Release 5.1, Part Number OL-6482-01, Rev. A0, January 25, 2005
Chapter 2 Configuring General Switch Features
Configuring Clock Sources
Figure 2-4 BITS Clock Source Ports on PXM-UI-S3/B Back Card
Note When using an external clock source and redundant PXM cards, use a Y-cable to connect that clock
source to the same clock port on both PXM cards. Otherwise, the clock source is available to only one
of the PXM cards.
Manually Configuring BITS Clock Sources
The following procedure describes how to configure the switch to use clock sources on the BITS ports.
Note For instructions on configuring the switch to use a clock source on a PXM1E line, refer to Chapter 4,
“Preparing Service Modules for Communication.” For instructions on configuring the switch to use a
clock source on an AXSM line, refer to the Cisco ATM Services (AXSM) Configuration Guide and
Command Reference for MGX Switches, Release 5.
Step 1 Establish a configuration session using a user name with GROUP1 privileges or higher.
Step 2 To configure a primary or secondary BITS clock source, enter the cnfclksrc command:
mgx8850a.7.PXM.a > cnfclksrc <priority> [shelf.]slot.port -bits {e1|t1} [-revertive
{enable|disable}]
Table 2-6 describes the parameters for this command.
89881
port 35
port 36
PXM
UI-S3/B
E
X
T
C
L
K
2
A
L
A
R
M
E
X
T
C
L
K
1
L
A
N
2
L
A
N
1
S
P
P2 P1
C
P