Cisco Systems Cisco ONS 15454 SDH manual DLP-D69 Set Up External or Line Timing

Chapter 4 Turn Up Node

DLP-D69 Set Up External or Line Timing

Step 1	Complete the “DLP-D60 Log into CTC” task on page 3-24the ONS 15454 SDH node where you want
	to set up timing. If you are already logged in, continue with Step 2.
Step 2	Complete the“DLP-D69 Set Up External or Line Timing” task on page 4-23if an external building
	integrated timing supply (BITS) source is available. This is the common SDH timing setup procedure.
Step 3	Complete the“DLP-D70 Set Up Internal Timing” task on page 4-25if you cannot complete Step 2 (an
	external BITS source is not available). This task can only provide Stratum 3 timing.
	Note For information about SDH timing, refer to the Cisco ONS 15454 SDH Reference Manual or to
		ITU-T G.784.
	Stop. You have completed this procedure.

DLP-D69 Set Up External or Line Timing

Purpose	This task defines the SDH timing source (external or line) for the
	ONS 15454 SDH.
Tools/Equipment	None
Prerequisite Procedures	DLP-D60 Log into CTC, page 3-24
Required/As Needed	Required
Onsite/Remote	Onsite or remote
Security Level	Provisioning or higher

Note CTC refers to Timing A and Timing B as BITS-1 and BITS-2. The MIC-C/T/P FMEC connector is labeled as Timing A and Timing B.

Step 1 In CTC node view, click the Provisioning > Timing tabs.

Step 2 In the General Timing area, complete the following information:

•Timing Mode—Choose External if the ONS 15454 SDH derives its timing from a MIC-C/T/P FMEC; choose Line if timing is derived from an STM-N card (non-DWDM node) or OSC card (DWDM node) that is optically connected to the timing node. A third option, Mixed, allows you to set external and line timing references. (Because mixed timing can cause timing loops, Cisco does not recommend its use. Use this mode with care.)

•Revertive—If this check box is selected, the ONS 15454 SDH reverts 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, indicate the amount of time the ONS 15454 SDH will wait before reverting to its primary timing source.

Step 3 In the BITS Facilities area, complete the following information:

Note The BITS Facilities section sets the parameters for your BITS-1 and BITS-2 timing references. Many of these settings are determined by the timing source manufacturer. If equipment is timed through BITS Out, you can set timing parameters to meet the requirements of the equipment.

	Cisco ONS 15454 SDH Procedure Guide, R4.6
January 2004		4-23