Theory of Operation Ver. 1.0 Aug. 2005
4.2
Communication Mode
4.2.1
Priority
• This system has two communication modes: ECM and G3. Communication will be estab-
lished with an appropriate mode determined by the capability of the remote terminal. The
priority of the communication modes is as follows:
Communication
Priority
mode
1st
ECM
2nd
G3
4.2.2
Communication modes of ECM/G3
• An optimal mode will be selected according to the capabilities of both terminals.
V.34/ECM
V.17/ECM
TX (Sender)
V.17/G3
V.29/ECM
V.29/G3
V.34: 2400 ~ 33600 bps starting mode
V.17: 14000 bps starting mode
V.29: 9600 bps starting mode
Followed ITU-T (Previously CCITT) recommendation
(Can communicate with other company's system).
Error correction by procedure signals.
Followed ITU-T (Previously CCITT) recommendation
(Can communicate with other company's system).
V.34/ECM
V.17/ECM
V.34/ECM
V.17/ECM
V.17/ECM
V.17/ECM
V.17/G3
V.17/G3
V.29/ECM
V.29/ECM
V.29/G3
V.29/G3
4. Communication Control
Remark
RX (Receiver)
V.17/G3
V.29/ECM
V.17/G3
V.29/ECM
V.17/G3
V.29/ECM
V.17/G3
V.29/G3
V.29/G3
V.29/ECM
V.29/G3
V.29/G3
V.29/G3
V.29/G3
V.29/G3
V.29/G3
V.29/G3
V.29/G3
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