Lucent Technologies Cajun M770 manual Viewing ATM Clock Synchronization Configuration

Chapter 3 Device Configuration

Viewing ATM Clock Synchronization Configuration

Some multimedia applications, such as voice, require that a single clock is propagated throughout the network. The clock source is usually a Public Telco switch connected to a local PBX through a telephony network. Using the Cajun M770 ATM Device, up to four external references can be configured, two from ATM ports and two from external E1/T1 sources. These are all directed to the M-SPS module which selects one of them to be the source input timing device. It uses the selected source to generate a 19.44MHz clock which is distributed to all modules. This is used by all ATM ports to synchronize Sonet frames.

The ATM Clock Synchronization dialog box provides information about the method currently configured for synchronizing the clocks in the Cajun M770 Device.

To view and edit clock synchronization parameters from Chassis View:

1Click .

OR

Open the Configuration menu and select ATM Clock Sync. The ATM Clock Synchronization dialog box appears.

Figure 3.6 Clock Synchronization Dialog Box

The ATM Clock Synchronization dialog box shows the module type, status, and current source of clock synchronization. It also provides a table of clock synchronization parameters for all the clock sources, and allows you to edit their configurations.

To edit the configuration of a clock synchronization source:

1Select one of the sources from the table.

2Modify the parameters in the Row Configuration area of the dialog box.

3Click OK. The configuration of the clock source is modified.

16 Cajun M770 Manager User’s Guide