Trace: ISDN Protocol Decode
Trace
Trace Details
D Channel Decodes help to verify that a call is successfully established, or determine why a call was not completed by
examining the protocol messages. The user can monitor layer 2 (Q.921) and layer 3 (Q.931) messages on the D Channel in
both terminate and monitor modes. Layer 2 results give technicians the ability to check link and D Channel status, verify LAPD
frames and check utilization rates. Following link establishment, layer 3 decodes allow technicians to verify such factors as call
state, who made or dropped the call, why the call was dropped, where the call is being carried (Interface ID/B channel) and call
types.
24.1.4 Call - Data Setup
Press Call to bring up the Call Setup menu. Fill out the call setup parameters as mentioned in
, but select
Data as the Call Type. Select a
Bearer Rate
in the call setup options. Press the
Pattern
tab and select a test pattern to be
transmitted on the B channel during data calls.
Note
: Test pattern is only applied when call button is pressed.
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