Oki OKIOFFICE 84 Service Manual page 374

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Service Guide OKIOFFICE 84

Chapter A Board Descriptions

300 bps Send Mode

Figure A2.4 shows the 300bps send protocol signal route.

In G3 communication, this is the route of the procedural control signals (pre-message, post-message phases etc.) at

The protocol send data is read into DRAM in the sequence the contents of various data stored in the FLASH

memory area in advance under the control of IOGA4 (CPU). The contents of the frame has been edited on the

DRAM by IOGA4 (CPU) and sent to MODEM via IOGA4 (CPU). HDLC (high level data link control) frame of the data

is structured by the modem and converted to serial data in synchrony with the modem's DCLK (data clock). After

modulation, the protocol signal is output from "S" of the modem and sent to the telephone line L1 and L2 via the

trans-former T1 of NCU.

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