user manual

3 Using Cisco Transport Controller 78-11719-02 July 2001
Cisco ONS 15327 User Documentation3-38
Procedure: Set Up ONS 15327 Timing
Step 1 Display the CTC node view.
Step 2 Click the Provisioning > Timing tabs (Figure 3-22).
Step 3 Enter the following information:
• Timing Mode—Set to External if timing is derived from an external BITS source wired
to the MIC; set to Line if timing is derived from an Optical Carrier card.
• 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, a ST3E message becomes a
ST3.
• Quality of RES—If your timing source supports the reserve S1 byte, you 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. See Table 3-13 and
Table 3-14 for more information.
• Revertive—If checked, the ONS 15327 reverts back to a primary reference source after
the conditions that caused it to switch to a secondary timing reference are corrected.
• Revertive Time—If Revertive is checked, enter the amount of time the ONS 15327 will
wait before reverting back to its primary timing source.
The BITS Facilities section sets the parameters used by your BITS1 and BITS2 timing
references. Many of these settings are determined by the timing-source manufacturer. The
BITS 1 port is on MIC-A and the BITS 2 port is on MIC-B.
• State—Set the BITS reference to IS (In Service) or OOS (Out of Service). For nodes
set to Line timing, set State to OOS; for nodes using external timing, or nodes using
the external BITS out, set State to IS.
RES Reserved; quality level set by user
Table 3-14 SSM Generation 2 Message Set
Message Quality Description
PRS 1 Primary reference source - Stratum 1
STU 2 Sync traceability unknown
ST2 3 Stratum 2
TNC 4 Transit node clock
ST3E 5 Stratum 3E
ST3 6 Stratum 3
SMC 7 SONET minimum clock
ST4 8 Stratum 4
DUS 9 Do not use for timing synchronization
RES Reserved; quality level set by user
Table 3-13 SSM Generation 1 Message Set (continued)
Message Quality Description