March 2000 © TOSHIBA TEC
9-19
DP120F/DP125F Dialing and Communication Procedure
b-5)
Control channel
The conventional T.30 procedure is performed. The transmission rate is 1200 bps.
•
Transmitter
•
Receiver
Signal name
Flag
Non-standard
facilities setting
Transmitting
Subscriber ID
Digital Command
Signal
——
Abbreviation
flags
NSS
TSI
DCS
1
Meaning
It maintains synchronization.
It receives an NSF sent from the
receiver. It selects the available
mode according to the received
NSF, then specifies the mode for
reception.
It indicates the telephone number
of the transmitter.
It specifies the mode that can be
communicated.
It declares to switch to the high-
speed procedure.
Remark
7E (H)
“1” is sent continuously.
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.
Signal name
Non-Standard
Facilities
Called Subscriber
ID
Digital Identification
Signal
Flag
Confirmation to
receive
Abbreviation
NSF
CSI
DIS
flags
CFR
Meaning
It indicates the facilities which are
not recommended by ITU-T, abbre-
viated user’s name, and manufac-
turer code.
It indicates the telephone number
of the receiver.
It indicates the standard facilities
recommended by ITU-T.
It maintains synchronization.
It indicates that the training of the
modem is complete, and the re-
ceiver is ready to receive the im-
age signal.
Remark
7E (H)
Summary of Contents for DP120F
Page 1: ...PLAINPAPERFACSIMILE File No 31200001 R0112216901 TTEC ...
Page 401: ...DP120F DP125F Circuit Description 7 92 March 2000 TOSHIBA TEC 07 05 00 Fig 7 5 1 ...
Page 656: ...DP120F DP125F Troubleshooting 11 44 March 2000 TOSHIBA TEC ...
Page 700: ...DP120F DP125F Appendix 12 2 March 2000 TOSHIBA TEC 1 2 Error Count List ...
Page 701: ...March 2000 TOSHIBA TEC 12 3 DP120F DP125F Appendix 1 3 Function List for Maintenance ...
Page 702: ...DP120F DP125F Appendix 12 4 March 2000 TOSHIBA TEC 1 4 Drum Unit ...
Page 703: ...March 2000 TOSHIBA TEC 12 5 DP120F DP125F Appendix 1 5 Memory Dump List ...
Page 706: ...SHUWA SHIBA PARK BLDG A 2 4 1 SHIBA KOEN MINATO KU TOKYO 105 8524 JAPAN ...