Service manual

Chapter 14
14-30
T-14-64
T-14-65
T-14-66
##759 [TX] In ECM transmission, the allowed number of procedure signal
retransmissions was exceeded after transmission of PPS-MPS
Cause: The line condition is poor; as such, although PPR was received 4 times after
transmission of PPS-MPS and then CTC was transmitted, the other party
could not receive it correctly.
Remedy: Increase the transmission level so that the other party may receive CTC
correctly.
Cause: The line condition is poor; as such, although PPR was received 4 times after
transmission of PPS-MPS and then CTC was transmitted, no significant
signal was received correctly thereafter.
Remedy: Ask the operator of the other party to increase the transmission level so that
the signal may be received correctly.
##760 [TX] In ECM transmission, no significant signal can be received after
transmission of PPS-EOM, and the allowed number of procedure signal
re-transmissions was exceeded
Cause: The line condition is poor, and the other party cannot receive PPS-EOM
correctly.
Remedy: (1) Increase the transmission level so that the other party may receive
PPSEOM correctly.
(2) Adjust the NL equalizer so that the other party may receive PPS-EOM
correctly.
(3) Add an echo protect tone to the V.29 modem signal for transmission.
Cause: The line condition is poor, and the significant signal cannot be received
correctly.
Remedy: Ask the operator of the other party to increase the transmission level so that
the signal may be received correctly.
##762 [TX] In ECM transmission, DCN was received after transmission of PPS-
EOM
Cause: The line condition is poor, and the other party cannot receive PPS-EOM
correctly.
Remedy: (1) Increase the transmission level so that the other party may receive
PPSEOM correctly.