Cisco ONS 15454 SDH Specifications download pdf (Page 160)

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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 3-14 Setting up external, line, or mixed ONS 15454 SDH timing

Step 2 In the General Timing section, 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 that is optically connected to the

timing node. A third option, Mixed, allows you to set external and line timing references. (Because

Mixed timing may cause timing loops, Cisco does not recommend its use. Use this mode with care.)

• Revertive—If this checkbox 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.

• Revertive 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 section, complete the following information:

Note The BITS Facilities section sets the parameters for your BITS1 and BITS2 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.

• 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 the BITS reference to IS (In Service) or OOS (Out of Service). For nodes set to Line

timing with no equipment timed through BITS Out, set State to OOS. For nodes using External

timing or Line timing with equipment timed through BITS Out, set State to IS.

• Coding—Choose the coding used by your BITS reference, either HDB3 or AMI. If you selected

2.048 MHz, or 64 KHz, the coding option is disabled.

Timing tab Provisioning tab

General timing

Node view Apply button

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