Specifications

CHAPTER 2 OPERATION AND TIMING
2-62
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©
1999 CANON INC. CANON SUPER G3 FAX BOARD-F1 REV.0 MAY 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
e. Control Channel
A T.30 procedure, as used in existing methods, is executed at a transmission speed of 1200 bps.
Transmitting Device
Signal
Flag
Non-standard
function settings
Communication
terminal
identification
Digital command
signal
Notation
flags
NSS
TSI
DCS
1
Description
Maintains synchronized state.
In response to NSF coming from
the receiving device, selects a
possible mode for reception.
Communicates the telephone
number of the transmitting device.
Specifies possible modes for
communication.
Makes a declaration for switching
to a high-speed.
Remarks
7E (H)
Sends 1s continuously.
Receiving Device
Signal
Non-standard
function
Callee terminal
identification
Digital
identification
signal
Flag
Reception ready
Notation
NSF
CSI
DIS
flags
CFR
Description
T functions, user abbreviation,
manufacturer code, and others.
Communicates the telephone
number of the receiving device.
Communicates ITU-Tstandard
functions.
Maintains synchronized state.
Communicates that the modem
has been trained and is ready to
receive image data.
Remarks
7E (H)
Memo:
In control channel exchanges, the transmitting and receiving devices generate signals of
different frequencies. As any signals echoed back would be a different frequency, the
exchanges would be echo-free.