中继告警指示的含义

LA(link active) The line is active and physically connected

　

RA (red alarm) The line is not connected, improperly configured, experiencing a very high error rate, or is not supplying adequate synchronization.

　

YA(yellow alarm) The MAX TNT is receiving a yellow alarm pattern. The yellow alarm pattern is sent to the MAX TNT to indicate that the other end of the line can not recognize the signals the MAX TNT is ransmitting.

　

DF(d-channel fail) The D channel for a PRI line is not currently communicating.