Toshiba DP120F Service Manual page 583

b-5) 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 to
receive
NOTE: In the control channel, the frequency of a signal to be sent is different be-
tween transmission and reception. The signal echoed back has never been
misidentified as a signal sent from the other unit. Therefore, this channel is
not influenced by a signal echoed back.
March 2000 © TOSHIBA TEC
Abbreviation
flags It maintains synchronization.
NSS It receives an NSF sent from the
receiver. It selects the available
mode according to the received
NSF, then specifies the mode for
reception.
TSI It indicates the telephone number
of the transmitter.
DCS It specifies the mode that can be
communicated.
1 It declares to switch to the high-
speed procedure.
Abbreviation
NSF It indicates the facilities which are
not recommended by ITU-T, abbre-
viated user's name, and manufac-
turer code.
CSI It indicates the telephone number
of the receiver.
DIS It indicates the standard facilities
recommended by ITU-T.
flags It maintains synchronization.
CFR It indicates that the training of the
modem is complete, and the re-
ceiver is ready to receive the im-
age signal.
Meaning
Meaning
9-19 DP120F/DP125F Dialing and Communication Procedure
Remark
7E (H)
"1" is sent continuously.
Remark
7E (H)