Dlp-B69 Set Up External Or Line Timing - Cisco ONS 15327 Procedure Manual

Chapter 3 Turn Up Node
Complete
Step 2
is available. This is the most common SONET timing setup procedure.
Complete
Step 3
external BITS source is not available). This task can only provide Stratum 3 timing.
Note
Stop. You have completed this procedure.

DLP-B69 Set Up External or Line Timing

Purpose
Tools/Equipment
Prerequisite Procedures
Required/As Needed
Onsite/Remote
Security Level
In the node view, click the Provisioning > Timing tabs.
Step 1
Under General Timing, complete the following information:
Step 2
•
Note
•
•
•
•
Under BITS Facilities, complete the following information:
Step 3
March 2003
the"DLP-B69 Set Up External or Line Timing" task on page 3-17
the"DLP-B70 Set Up Internal Timing" task on page 3-19
For information about SONET timing, refer to the Cisco ONS 15327 Reference Manual or to
Telcordia GR-253-CORE.
This task defines the external or line SONET timing source for the ONS
15327.
None
DLP-B60 Log into CTC, page 2-23
Required
Onsite or remote
Provisioning or higher
Timing Mode—Choose External if the ONS 15327 derives its timing from a BITS source wired to
the port on the MIC; choose Line if timing is derived from an OC-N card that is optically connected
to the timing node. A third option, Mixed, allows you to set external and line timing references.
Because Mixed timing may cause timing loops, Cisco does not recommend its use. Use this
mode with care.
SSM Message Set—Choose the message set level supported by your network. If a Generation 1 node
receives a Generation 2 message, the message will be mapped down to the next available
Generation 1. For example, an ST3E message becomes an ST3.
Quality of RES—If your timing source supports the reserved S1 byte, set the timing quality here.
(Most timing sources do not use RES.) Qualities are displayed in descending quality order as ranges.
For example, ST3<RES<ST2 means the timing reference is higher than a Stratum 3 and lower than
a Stratum 2. Refer to the Cisco ONS 15327 Reference Manual for more information about SSM,
including definitions of the SONET timing levels.
Revertive—Check this check box if you want the ONS 15327 to revert to a primary reference source
after the conditions that caused it to switch to a secondary timing reference are corrected.
Reversion Time—If Revertive is checked, choose the amount of time the ONS 15327 will wait
before reverting to its primary timing source. Five minutes is the default.
NTP-B28 Set Up Timing
if an external BITS source
if you cannot complete
Cisco ONS 15327 Procedure Guide, R4.0
Step 2 (an
3-17