FlexGain PLEX - Definity; Megatrans

User’s manual FlexGain Plex, V2
Version 1.3
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Table 4. MMX signaling.
Status of
signaling bits in
the time slot
Direction Signal
а b
Description
FXS <--> FXO Idle state 0 1
FXS ---> FXO Busy 1 0
FXS ---> FXO Pulsed dialing 1/0 0
During pulsed dialing the status of the “a” bit
changes.
FXS ---> FXO Hang up 0 0 Signals are transmitted in both directions.
FXS <--> FXO Idle state 0 1 Signals are transmitted in both directions.
FXO ---> FXS Busy 1 0
FXO ---> FXS Ringing 1 1/0
The FXS side generates a ring signal, when the
value of the “a” bit changes.
FXS ---> FXO Hang on 1 0
FXO ---> FXS Hang on confirmation 1 0
The voice channel is connected. The combination
does not depend when the tube was hanged on.
FXS ---> FXO Hang up 0 0 Signals are transmitted in both directions.
FXS <--> FXO Idle state 0 1 Signals are transmitted in both directions.
1.9.3 Definity®.
The description of this type of signaling is presented in documents on the Definity
PBX.
1.9.4 MEGATRANS.
The advantage of this type of signaling is the fact that it does not use an additional
time slot to transmit signaling.
Voice data and signaling are transmitted in the same stream 64 kbit/s (one time
slot). The Encoding method used is G.711, α law.
To transmit signaling together with the voice data, 8-bit PV combination (free-
channel constant) is used, which in the voice data, this combination is replaced by RV
(replacement constant). The value of PV and RV constants for each voice port are
configured by the <SIGBYTE> command.