18-48
Cisco ONS 15454 SDH Procedure Guide, R7.0
78-17194-01
Chapter 18 DLPs D100 to D199
DLP- D157 Change the Node Timing Source
DLP-D157 Change the Node Timing Source
Caution The following procedure might be service affecting and should be performed during a scheduled
maintenance window.
Note See the “DLP-D69 Set Up External or Line Timing” task on page 17-58 for descriptions of the fields
mentioned in this task.
Step 1 In node view, click the Provisioning > Timing > General tabs.
Step 2 In the General Timing section, change any of the following information:
• Timing Mode
Note Because mixed timing can cause timing loops, Cisco does not recommend using the Mixed
Timing option. Use this mode with care.
• Revertive
• Reversion Time
Step 3 In the Reference Lists area, you can change the following information:
Note Reference lists define up to three timing references for the node and up to six BITS Out
references. BITS Out references define the timing references used by equipment that can be
attached to the node’s BITS pins on the MIC-C/T/P. If you attach equipment to BITS Out pins,
you normally attach it to a node with Line mode because equipment near the external timing
reference can be directly wired to the reference.
• NE Reference
• BITS-1 Out
• BITS-2 Out
Step 4 Click the BITS Facilities tab.
Step 5 In the BITS In and BITS Out areas, you can change the following information:
Note The BITS Facilities section sets the parameters for your BITS-1 and BITS-2 timing references.
Many of these settings are determined by the timing source manufacturer. If equipment is timed
through BITS Out, you can set timing parameters to meet the requirements of the equipment.
Purpose This task changes the SDH timing source for the ONS 15454 SDH.
Tools/Equipment None
Prerequisite Procedures DLP-D60 Log into CTC, page 17-49
Required/As Needed As needed
Onsite/Remote Onsite or remote
Security Level Provisioning or higher
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