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FAX-L1000 Chapter 3: Technical Reference
b-5) Control channel
The conventional T.30 protocol is executed.
The transmission speed is 600bps.
• Transmitter
Abbre-
Signal viation Meaning Remarks
Flag flags Maintain synchronization. 7E (H)
Non-standard NSS Receive NSF from the
facilities set-up other party, select an
available mode from it,
and instruct reception.
Transmitting TSI Report the transmitter
subscriber telephone number.
identification
Digital command DCS Instruct the available
signal mode.
———
1 Declare to switch to high- Transmit 1's.
speed protocol.
• Receiver
Abbre-
Signal viation Meaning Remarks
Non-standard NSF Report functions not
facilities recommended by ITU-T,
user’s ID,
manufacturer code, etc.
Called subscriber CSI Report the receiver
identification telephone number.
Digital identification DIS Report standard ITU-T-
signal recommended functions.
Flag flags Maintain synchronization. 7E (H)
Confirmation to CFR Report that modem
receive training ends and image
signal reception is ready.
NOTE
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.