Xerox WorkCentre M20

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December 2006

6-46

WorkCentre M20, 4118, FaxCentre 2218 Family

GP 13

General Procedures and Information

M20 FAX Transceiver

General

This circuit processes transmission signals of modem and between LIU and modem.

Modem (U44)

FM336 is a single ship fax modem. It has functions of DTMF detection and DTMF signal pro-

duction as well as functions of a modem. TX A1, 2 is a transmission output port and RX IN is a

received data input port. / POR signal controlled by MFP controller (U3:ARM946ES) can initial-

ize modem (/M_RST) without turning off the system. D0-D7 are 8-bit data buses. RS0-RS4 sig-

nals to select the register in modem chips. /RS and /WR signals control READ and WRITE

respectively. /IRQ is a signal for modem interrupt.

Transmission speed of FM336 is supported up to 33.6k.

The modem is connected to LINE through transformer directly, refer to Figure 4.

Figure 4 Fax transceiver

4118/2218 SmartDAA FAX Technology

General

SmartDAA System Side Device (CX86710) and Line Side (CX20493) enables the 4118 to

communicate with other FAX machines. Communication speeds are able to reach 33.6kbps.

The SmartDAA technology only requires a RJ-11 jack connected to a telephone line. Commu-

nication with other FAX machines are then managed via software. The LIU hardware configu-

rations are no longer country dependant therefore there is no need for different LIU PBA’s.