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Control channel
The conventional T.30 procedure is performed. The transmission rate is 1200 bps.
Transmitter
Signal name
Flag
Non-standard facilities
setting
Transmitting Subscriber
ID
Digital Command Signal
-
Receiver
Signal name
Non-Standard Facilities
Called Subscriber ID
Digital Identification Signal
Flag
Confirmation for
Reception
Remarks:
In the control channel, the frequency of the signals to be sent is different between the
transmission and reception. The signal echoed back has never been misidentified as a signal
sent from the other side. Therefore, this channel is not influenced by signals echoed back.
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Abbreviation
flags
Maintains the
synchronization.
NSS
Receives an NSF sent from
the receiver. It selects the
available mode from the
received NSF, and specifies
the mode for the reception.
TSI
Informs the telephone number
of the transmitter.
DCS
Specifies the mode that can
be used for the
communication.
1
Declares to switch to the high-
speed procedure.
Abbreviation
NSF
Informs the presence of the
facilities other than those
recommended by ITU-T,
abbreviated user names, and
manufacturer codes, etc.
CSI
Informs the telephone number
of the receiver.
DIS
Informs the standard facilities
recommended by ITU-T.
flags
Maintains the
synchronization.
CFR
Informs that the training of the
modem is completed, and the
receiver is ready to receive
the image signal.
3 - 17
Function
7E (H)
"1" is sent continuously.
Function
7E (H)
DIALING/COMMUNICATION CONTROL
Remarks
Remarks
GD-1370
3
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