Timing features
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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
Features
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365-312-801R7.2
Issue 3, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
2-21
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