Carrier Access Access Navigator Set Clock, Syntax set clock1clock2 setting, Setting Description

CLI Language Reference

CLI Command List

Set Clock

Purpose: Selects the system master transmit clock source. The Access Navigator can obtain its timing from a DS1 line receiver, external Building Integrated Timing Supply (BITS), or its internal Stratum clock oscillator. Clock1 is the primary system clock source.

Clock2 is the secondary system clock source, which will be used if the primary clock source (Clock1) fails.

NOTE: DS1s will use the master clock when the DS1 clock source is set to normal using the set ds1 clock command.

The user can assign primary and secondary clock sources. If the primary source fails, the Access Navigator will automatically switch over to the secondary clock source. If both clock sources are external sources (DS1 or BITS) and both sources are lost, the Access Navigator will use a “hold over” mode to maintain the last clock frequency.

If the Access Navigator provides GR-303 call support, the primary and secondary clock sources are usually set to “switch” DS1s in the GR-303 interface group.

CAUTION! IF YOU REMOVE A QUAD T1 FRAMER CARD PROVIDING A DS1 CLOCK SOURCE, THE HOLD-OVER MODE WILL NOT MAINTAIN SYSTEM CLOCKING WITHIN SPECIFICATIONS. BEFORE REMOVING THE CARD, YOU SHOULD ALWAYS MOVE THE CLOCK SOURCE TO A DS1 ON A DIFFERENT CARD.

Security: Level 2 (operator)

Syntax: set <clock1clock2> <setting>

Field	Description
clock1	Primary system clock source
clock2	Secondary system clock source, which will be used if the
	primary clock source (Clock1) fails

Setting	Description
bits	Select Building Integrated Timing Source.
ds1 <n>	Select DS1 line receiver, n = 1 to 32.
internal	Select internal oscillator.

Example: set clock1 ds1 12

Example: set clock2 bits

Example: set clock2 internal

18-96 August 2003 Access Navigator - Release 1.8