Cisco ONS 15327, Пользовательская документация

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3-15
Cisco ONS 15327 User Documentation, R3.3
June 2002
Chapter 3 Node Setup
Setting Up ONS 15327 Timing
Figure 3-5 Setting Up ONS 15327 timing
Step 5
Click Apply .
Note Refer to Chapter 10, “Alarm Monitoring and Management,” for timing-related alarms.
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 15327s 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.