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Frame Slip Alarms and Noises Occur When the U1910 Connects to a Device Through the T1 Trunk

Publication Date:  2015-07-14 Views:  557 Downloads:  0

Issue Description

When the eSpace U1910 connects to a device through the T1 trunk, a lot of frame slip alarms and noises occur.

Handling Process

Step 1 Check the E1 jumper caps on the CVP board and remove all jumper caps. For details about the jumper locations, see the product installation manual.

Step 2 Run the show mrsparas command to check whether TdmCodec is set to U_LAW. If no, run the config modify mrsparas tdmcodec ulaw command to set this parameter to U_LAW. By default, this parameter is set to A_LAW, but it should be set to U_LAW in T1 mode.

Step 3 Run the show system clocksource information command to check the clock source configuration. If the configuration is incorrect, run the config system clocksource command to configure the clock source.

Step 4 If the fault persists, contact the service provider.


Root Cause

The possible causes are as follows:
  • E1 jumper caps are not removed on the CVP board, affecting the E1 working mode.
  • The MRS parameter TdmCodec is not set to U_LAW.
  • The clock source is not configured.