Cisco ONS 15454 SDH Specifications download pdf (Page 163)

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Cisco ONS 15454 SDH Installation and Operations Guide, R3.3

May 2002

Chapter 3 Node Setup

Setting Up ONS 15454 SDH Timing

Figure 3-16 Setting up internal ONS 15454 SDH timing

Step 3 In the General Timing section, enter the following:

• Timing Mode—Choose External.

• Revertive—Not relevant for internal timing; the default setting (checked) is sufficient.

• Revertive Time—Not relevant for internal timing; the default setting (5 minutes) is sufficient.

Step 4 In the BITS Facilities section, enter the following information:

• E1, 2.048 MHz, 64 KHz—Choose E1, 2.048 MHz, or 64 KHz depending on the signal supported in

your market. For example, 64 KHz is used in Japan. E1, 2.048 MHz, and 64 KHz are physical signal

modes used to transmit the external clock (from a GPS for example) to BITS.

• State—Set BITS 1 and BITS 2 to OOS (Out of Service).

• 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. Synchronization status message (SSM) is used

to deliver clock quality. The SSM supported in SDH is G811, STU, G812T, G812L, SETS, DUS

(ordered from high quality to low quality). If you selected 2.048 MHz, or 64 KHz, the SSM option

is disabled.

• AIS Threshold—Not relevant for internal timing.

• LBO—Not relevant for internal timing; line build out (LBO) relates to the BITS cable length.

• Sa bit—Not relevant for internal timing; the Sa bit is used to transmit the SSM message.

Step 5 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.

Timing tab Provisioning tab

General timing

Node view Apply button

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