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
Manually Configuring BITS Clock Sources
The following procedure describes how to configure the switch to use clock sources on the BITS clock
ports.
Note For instructions on configuring the switch to use a clock source on an AXSM line, see the “Configuring
AXSM Line Clock Sources” section in Chapter 6, “Provisioning AXSM Communication Links.”
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 2-7 describes the parameters for this command.
Step 3 To configure an additional BITS clock source, repeat Step 2 using the correct parameters for the
additional source.
Step 4 To display the clock source configuration, enter the dspclksrcs command, which is described in the
“View the Configured Clock Sources” section in Chapter 7, “Switch Operating Procedures.”.
Table 2-7 Parameter Descriptions for cnfclksrc Command when Used for PMX 45
Parameter Values Descriptions
priority primary or secondary Replace <priority> with the type of clock source, which
is either primary or secondary. The default is primary.
shelf 1The <shelf> value is always 1 and is optional.
slot 7The <slot> number is 7 for the BITS clocks regardless of
whether the active PXM45 is in slot 7 or 8
port 35 to 36 The <port> number identifies the port on the
PXM45-UI-S3 to which the BITS clock is connected and
the type of line connected. Select the appropriate port
number from the following:
• Port 35 = T1 or E1 clock connected to upper clock
port
• Port 36 = T1 or E1 clock connected to lower clock
port
-bits e1 or t1 The -bits option specifies whether the clock source line
is an E1 or T1.
-revertive enable or disable The -revertive option enables or disables the revertive
feature for the BITS clock sources.