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Cisco ONS 15454 SDH Procedure Guide, R4.6
January 2004
Chapter4 Turn Up Node DLP-D70 Set Up Internal Timing
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Timing Mode set to Line—Your options are the node’s working OC-N cards (non-DWDM
nodes),or OSC cards (DWDM nodes) and Internal Clock. Select the cards/ports that are directly
or indirectly connected to the node wired to the BITS source, that is, select the node’s trunk
cards. Set Reference 1 to the trunk card that is closest to the BITS source. For example,if Slot 5
is connected to the node wired to the BITS source, select Slot 5 as Reference 1.
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Timing Mode set to Mixed—Both BITS and optical cards are available, allowing you to set a
mixture of external BITS and optical trunk (span) cards as timing references.
•BITS-1 Out/BITS-2 Out—Define the timing references for equipment connected to the Timing A
Out or TimingB Out FMEC connector. Normally, Timing Out is used with line nodes, so the options
displayed are the working optical cards. Timing A Out and Timing B Out are enabled as soon as
BITS-1 and BITS-2 facilities are placed in service.
Step 6 Click Apply.
Note Refer to the Cisco ONS 15454 SDH Troubleshooting Guide for timing-related alarms.
Step 7 Return to your originating procedure (NTP).
DLP-D70 Set Up Internal Timing
Caution Internal timing is Stratum 3 and not intended for permanent use. All ONS 15454 SDH nodes should be
timed to a Stratum 2 or better primary reference source.
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 node view, click theProvisioning > Timing tabs.
Step 2 In the General Timing area, enter the following:
•Timing Mode—Choose External.
•Revertive—Not applicable for internal timing; the default setting (checked) is sufficient.
•Reversion Time—Not applicable; leave unchanged. For internal timing, the default setting
(5 minutes) is sufficient.
Step 3 In the BITS Facilities area, enter the following information:
Purpose This task sets up internal timing (Stratum 3) for an ONS 15454 SDH.
Tools/Equipment None
Prerequisite Procedures DLP-D60 Log into CTC, page 3-24
Required/As Needed As needed (use only if a BITS source is not available)
Onsite/Remote Onsite or remote
Security Level Provisioning or higher