Cisco Systems manual Procedure Set Up ONS 15327 Timing

3 Using Cisco Transport Controller				78-11719-02 July 2001
	Table 3-13	SSM Generation 1 Message Set (continued)
	Message	Quality	Description
	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

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 3-13and Table 3-14for 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.

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