-Network interaction (Phase 1)
The V.8 procedure is performed as the startup procedure for the V.34
In the V.8 procedure, mainly the optimum modulation method (V series modem mode) that can be operated between the transmitter and receiver is determined.
Transmitter
Signal name | Abbreviation | Function | Remarks |
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Calling tone | CNG | 1100 Hz tone signal specified | - |
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| by T.30 indicating the sender |
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| is a FAX machine in the auto- |
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| matic calling mode. |
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Call Menu signal | CM | Mainly indicates an available | Modulated by V.21 (L) *1. |
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| modulation method such as | Transmission rate: 300 bps |
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| V.21, V.27ter, V.29, V.17, |
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| V.34, etc. |
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CM terminator | CJ | Indicates the detection of the | Modulated by V.21 (L) *1. |
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| JM signal or the termination of | Transmission rate: 300 bps |
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| CM signal. |
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Call Indicator signal | CI | Indicates the general commu- | For the late start only. |
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| nication functions. It is sent | |
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| when the V.8 procedure is | Modulated by V.21 (L) *1. |
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| restarted. | Transmission rate: 300 bps |
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Receiver
Signal name | Abbreviation | Function | Remarks |
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Answer amplitude tone | ANSam | 2100 Hz tone signal ampli- | Tone equivalent to CED of the |
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| conventional machine. | |
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Joint Menu signal | JM | Indicates the terminal type | Modulated by V.21 (H) *1. |
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| such as a FAX machine. | Transmission rate: 300 bps |
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| Response to a CM sent from |
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| the transmitter and informs |
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| available modulation method. |
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*1 V.21 (L) ..........Low frequency channel defined by the V.21 recommendation 1,080±100 Hz
(980 Hz: 1, 1,180 Hz: 0)
V.21 (H) ..........High frequency channel defined by the V.21 recommendation 1,750±100 Hz
(1,650 Hz: 1, 1,850 Hz: 0)
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