Canon FAX-L350 Service Manual

Also see for FAX-L350: Simplified guide Service manual

Contents

Canon FAX-L350 Service Manual Manual pdf 81 page image

2-24FAX-L350 Chapter 2: Technical Reference7. NEW FUNCTION7.1 High-speed TransmissionThe image transmission time is reduced drastically compared with the previous models by the V.34 modem(maximum transmission speed 33600 bps) recommended by ITU-T.7.1.1 V.8/V.34 protocola) Outline• The V.8 protocol is used as the startup protocol to move to V.34. The V.8 protocol enables connectionwith fax machines, data modem and equipment using existing V-series modems. The V.34 modemcontains a modem circuit based on the previous recommendation to connect with the previous modemsand has upper compatibility.• The actual data transmission speed is improved entirely on average by speeding the modulation methodand utilizing new techniques, such as the pre-emphasis technique *1 for increasing the S/N (signal-to-noise) ratio and the probing technique *2 for measuring line characteristics and optimizing the modemoperation according to the line condition.• The V.8 protocol, V.34 pre-protocol and post-protocol use full-duplex transmission to speed the process-ing.• Fourteen image transmission speeds*3 are available:33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, 14400, 12000, 9600, 7200, 4800, and 2400bps• The modulation speed (baud rate) *4 can be selected from among 2400, 3000, and 3200 symbols/sec(required) or 2743, 2800, and 3429 symbols/sec (option). The data transmission speed can be set morefinely than the previous modems.*1 The output level of a high-frequency zone with comparatively high noise is raised, andthen the transmission signal is sent.*2 A tone signal known as a probing signal (L1 and L2) is output, and the receiving sidemeasures the characteristics of the line.*3 The data signaling rate is recorded in the ITU-T standards manual. Image transmissionspeed means the same as data signaling rate.*4 The symbol rate is recorded in the ITU-T standards manual. Symbol rate means thesame as moderation speed and baud rate.2743 symbol/sec cannot be used with this fax.NOTE