d-Color MF4003/MF3303
P THEORY OF OPERATION > 8. FK-517
P-94
bit Function Contents Default
123 Internet aware fax device operating in T.38 mode 0
124 T.89 (Application profiles for ITU-T T.88) Refer to *3. 0
125 0
126 0
127 sYCC-JPEG coding 0
• *3: T.89 (Application profile for ITU-T T.88)
124 125 126 Contents
0 0 0 Not used
0 0 1 Profile 1
0 1 0 Profile 2
0 1 1 Profile 3
1 0 0 Invalid
1 0 1 Reserved
1 1 0 Reserved
1 1 1 Reserved
8.1.2Modem fallback sequence
• Fallback sequences of TCF and CTC are shown as follows:
(1)V17, V29, and V27 ter
Ability of a remote station TCF fallback sequence
V27 ter/V29 96/V.29 -> 72/V.29 -> 48/V.27 ter -> 24/V27 ter
V27 ter/V29/V33 V17 144/V.17 -> 120/V.17 -> 96/V.17 -> 72/V.17 -> 48/V.27 ter -> 24/V27 ter
• On the transmission side: If PPR is received four times, a modem is set in the fallback state.
• On the reception side: In case of sending PPR, when the number of error frames exceeds the FP value, a modem is set in the fallback
state.
(2)V34 fallback
• Line quality is always water by modem. Optimum speed is automatically selected on-the-fly.
8.1.3V8/V34 sequence
(1)V34
(a)Outline
• The 33.6kbps data transmission method and protocol including the V8 protocol. As for each of full-duplex and half-duplex, startup
handshake until data transmission starts is divided into four phases, phase1 to 4, and signals used in each phase are regulated.
(b)Features
• Full-duplex (echo canceler method) / Half-duplex method are regulated (for data / FAX respectively)
• 2400, 3000 and 3200 symbols / sec (mandatory) and 2743, 2800 and 3429 symbols / sec (option) QAM synchronous transmission at
each symbol rate
• Communication at each signal rate of 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, 14400, 12000, 9600, 7200, 4800
and 2400 bps
• Four-dimensional-symbol trellis coding
• A 200bps sub channel which can be used as an asynchronous second channel (option)
• Negotiation in which characteristics of a line is measured before transmission starts and the maximum communication speed is
achieved by finely adjusting the transmission parameter, based on the result of measurement (carrier / frequency / equalizer / symbol
rate / level, etc.)
• Data transmission in the super frame with the hierarchical structure
(2)Sample of a signal procedure at sending two pages
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