Oki OKIOFFICE 84 Service Manual page 376

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Table of Contents

Service Guide OKIOFFICE 84

Chapter A Board Descriptions

300 bps Receive Mode

Figure A2.5 shows 300bps receive protocol signal route.

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

The 300bps modulated signals received via the telephone line L1 and L2 of the NCU are sent from pin R to Pin

RXA1 of the modem. After demodulation by the modem, the demodulated digital signals are sent to the IOGA4

(CPU) via the data bus from the modem. The data is read and decoded by the IOGA4 (CPU) and written into the

DRAM. The written data is interpreted according to bit assignment of the binary procedural signals in the ITU

recommendations. The successive modes of communication (for example, line density, encoding scheme, etc.) are

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