GD-1150/1151/1200/1201/1160/1260
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DIALING/COMMUNICATION CONTROL
3 - 18
- Control channel
The conventional T.30 procedure is performed. The transmission rate is 1200 bps.
Transmitter
Receiver
Reference:
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.\
Signal name
Abbreviation
Function
Remarks
Flag
flags
Maintains the synchroniza-
tion.
7E (H)
Non-standard facilities
setting
NSS
Receives an NSF sent from
the receiver. It selects the
available mode from the
received NSF, and specifies
the mode for the reception.
Transmitting Subscriber
ID
TSI
Informs the telephone number
of the transmitter.
Digital Command Signal
DCS
Specifies the mode that can
be used for the communica-
tion.
-
1
Declares to switch to the high-
speed procedure.
“1” is sent continuously.
Signal name
Abbreviation
Function
Remarks
Non-Standard Facilities
NSF
Informs the presence of the
facilities other than those rec-
ommended by ITU-T, abbrevi-
ated user names, and
manufacturer codes, etc.
Called Subscriber ID
CSI
Informs the telephone number
of the receiver.
Digital Identification Signal
DIS
Informs the standard facilities
recommended by ITU-T.
Flag
flags
Maintains the synchroniza-
tion.
7E (H)
Confirmation for Recep-
tion
CFR
Informs that the training of the
modem is completed, and the
receiver is ready to receive
the image signal.