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40672201TX Rev.4
7 - 1
7. COMMUNICATION
7.1 Transmission Line
The machine will reliably communicate with distant stations over voice-level telephone line.
7.2 Telephone Line Connection
The machine will be connected to the telephone line via a Network Control Unit (NCU). One
RJ-11 connector will be provided to connect the line.
The machine will control the switching between the external telephone and the telephone line
to permit the user to use the optional handset or telephone for voice communication.
7.2.1 International NCU
The NCU will be designed and constructed to meet worldwide PTT requirements.
Modular connectors will be provided for connection to the telephone and telephone line,
depending upon each PTT requirement.
7.3 Communication Mode
The machine will operate as a half-duplex facsimile transceiver. Transmit and receive
operations cannot take place at the same time.
7.4 Modem Operation
The high-speed modem will conform to ITU-T standard V29 for 9600/7200 bps (bits per
second) operation and to ITU-T standard V27 ter. for 4800/2400 bps operation, and to ITU-T
standard V.17, V.33 for 14400/12000 bps operation.
The low-speed (300 bps) modem will conform to ITU-T standard V21 channel 2 or equivalent.