...................................................................................................................................................................................................................................

Synchronization modes

Several synchronization configurations can be used. 1643 Access Multiplexer AM /

1643 Access Multiplexer Small AMS can be provisioned for the following timing

modes:

• free-running operation

• holdover mode

• locked mode

In locked mode, the internal SDH Equipment Clock (SEC) is locked to:

• one of the STM-1 or STM-4 (1643 AM only) aggregate signals.

• one of the sixteen 2 Mbit/s tributary signals from the main board or the respective

option card

Note: The1643 AMS supports one of the sixteen 1.5 Mbit/s tributary signals from

the main board or option card in locked mode.

• one of the STM-1 signals (1643 AM only) from the respective option card

365-312-801R7.2

Issue 3, May 2007

Alcatel-Lucent - Proprietary

See notice on first page

2-21

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