17-61
Cisco ONS 15454 SDH Procedure Guide, R7.0
78-17194-01
Chapter 17 DLPs D1 to D99
DLP- D70 Set Up Internal Timing
DLP-D70 Set Up Internal Timing
Caution Internal timing is SETS timing, and is not intended for permanent use. All ONS 15454 SDH nodes
should be timed to a SETS 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 the Provisioning > Timing > General 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 Reference Lists section, enter the following information:
• NE Reference
–
Ref1—Set to Internal Clock.
–
Ref2—Set to Internal Clock.
–
Ref3—Set to Internal Clock.
• BITS-1 Out/BITS-2 Out—Set to None.
Step 4 Click Apply.
Step 5 Click the Provisioning > Timing > BITS Facilities tabs.
Step 6 In the BITS Facilities area, enter the following information:
• E1, 2 MHz—Choose E1 or 2 MHz depending on the signal supported in your market. E1 or 2 MHz
are physical signal modes used to transmit the external clock (from a GPS, for example) to BITS.
• BITS In State—Set BITS-1 and BITS-2 to locked.
• BITS Out State—Set BITS-1 and BITS-2 to locked.
• Coding—Not relevant for internal timing; the default (HDB3) is sufficient.
• Framing—Not relevant for internal timing; the default (FAS + CAS + CRC) is sufficient.
• Sync Messaging—The box is checked automatically. SSM is used to deliver clock quality. The
SSMs supported in SDH are G811, STU, G812T, G812L, SETS, DUS (ordered from high quality to
low quality). If you selected 2 MHz, the SSM option is disabled.
Purpose This task sets up internal timing (SETS) for an ONS 15454 SDH.
Tools/Equipment None
Prerequisite Procedures DLP-D60 Log into CTC, page 17-49
Required/As Needed As needed (use only if a BITS source is not available)
Onsite/Remote Onsite or remote
Security Level Provisioning or higher
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