Version 6.6 525 October 2014
Installation & Operation Manual 38. Configuring the PSTN Subsystem
38.8.3.2.1 Configuring the DS3 Interface
For T3 configurations, the Timing Module on the SA-1/RTM rear card controls clock
settings of the individual DS1 trunks only. Timing of the DS3 Interface (high-level
communication protocol on the PSTN Interface) should be configured similar to the
Standalone Board Sync mode.
To configure timing of the DS3 interface:
1. Click
to access the Media Gateway status screen.
2. Select the desired Media Gateway board.
3. In the Navigation pane, select PSTN
DS3; the DS3 Interfaces List is displayed.
4. Select a specific row and then in the configuration pane, click DS3 Settings; the
DS3 Setting screen is displayed.
5. Configure the DS3 Clock Source parameter as follows:
• master – the clock is taken from the internal board's clock reference.
• slave – the clock is taken from the DS3 protocol layer of the PSTN interface.
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