Canon MultiPASS C530 Service Manual page 121

MultiPASS C530/C560 Chapter 2: Technical Reference
b-5) Control channel
The conventional T.30 protocol is executed.
The transmission speed is 600bps.
• Transmitter
Signal
Flag
Non-standard facilities
set-up
Transmitting subscriber
identification
Digital command signal
———
• Receiver
Signal
Non-standard facilities
Called subscriber
identification
Digital identification
signal
Flag
Confirmation to receive
NOTE
Abbre-
viation
flags
NSS
TSI
DCS
1
Abbre-
viation
NSF
CSI
DIS
flags
CFR
In the control channel, signals which differ according to the frequencies of both TX and
RX are output. It follows that the effects of the echo are not received because the
frequencies of the signal returned by echo and the signal output by the other machine are
different.
Meaning
Maintain synchronization.
Receive NSF from the other party,
select an available mode from it,
and instruct reception.
Report the transmitter telephone
number.
Instruct the available mode.
Declare to switch to high-
speed protocol.
Meaning
Report functions not recommended
by ITU-T, user's ID,
manufacturer code, etc.
Report the receiver
telephone number.
Report standard ITU-T-
recommended functions.
Maintain synchronization.
Report that modem training ends
and image signal reception is ready.
2-42
Remarks
7E (H)
Transmit 1's.
Remarks
7E (H)