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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter3 Node Setup
Setting Up ONS 15454 Timing
Procedure: Set Up Internal Timing
If no BITS source is available, you can set up internal timing by timing all nodes in the ring from the
internal clock of one node.
Caution Internal timing is Stratum 3 and not intended for permanent use. All ONS 15454s should be timed to
a Stratum 2 or better primary reference source.
Step 1 Log into the node that will serve as the timing source.
Step 2 In the CTC node view, click the Provisioning > Timing tabs.
Step 3 In the General Timing section, enter the following:
•Timing Mode—Set to External.
•SSM Message Set—Set to Generation 1.
•Quality of RES—Set to DUS.
•Revertive—Is not relevant for internal timing; the default setting (checked) is sufficient.
•Revertive Time—The default setting (5 minutes) is sufficient.
Step 4 In the BITS Facilities section, enter the following information:
•State—Set BITS 1 and BITS 2 to OOS (Out of Service).
•Coding—Is not relevant for internal timing. The default (B8ZS) is sufficient.
•Framing—Is not relevant for internal timing. The default (ESF) is sufficient.
•Sync Messaging—Checked
•AIS Threshold—Is not available.
Step 5 In the Reference Lists section, enter the following information
•NE Reference
–
Ref1—Set to Internal Clock.
–
Ref2—Set to Internal Clock.
–
Ref3—Set to Internal Clock.
•BITS 1 Out/BITS 2 Out—Set to None
Step 6 Click Apply.
Step 7 Log into a node that will be timed from the node set up in Steps 1–4.
Step 8 In the CTC node view, click the Provisioning > Timing tabs.
Step 9 In the General Timing section, enter the same information as entered in Step 3, except for the following:
•Timing Mode—Set to Line.
Reference Lists
•NE Reference
–
Ref1—Set to the OC-N trunk card with the closest connection to the node in Step 3.
–
Ref2—Set to the OC-N trunk card with the next closest connection to the node in Step 3.
–
Ref3—Set to Internal Clock.
Step 10 Click Apply.