RAD Data comm ASMi-31 operation manual INT/RCV Mode, Modem a

ASMi-31Installation and Operation Manual	Appendix B. IR-G.703 Codirectional Interface (64 kbps)
	Modem A	Modem B

	IR-G.703 Module
	TX Data	Data		TX	RX
	Clock
		CLK
G.703	Recovery
	Clock
Codirectional		FIFO
	Out
64 kbps network		Data			Clock
					Recovery
	RX Data		Clock	RX	TX
Timing Source			Recovery
		Clock In
	FIFO
	EXT Clock Mode				RCV Clock Mode

Figure B-3 IR-G.703 EXT Mode Timing Block

B.4 INT/RCV Mode

This mode is used in applications where the G.703 Codirectional 64 kbps equipment connected to the modem recovers the clock signal from the modem link. This mode is used mainly when the attached equipment has a G.703 Codirectional interface, but is not able to produce clock signals. The module has a 8-bit FIFO buffer to compensate for the phase delay introduced by the G.703 device. Figure B-4illustrates the buffer connection and the required application setup.

This mode corresponds to the modem clock working in the INT or RCV mode.

Modem A Modem B

DTE		LINK				G.703
side		side				side
					IR-G.703 Module	RX Data
		TX	RX	Clock	Data
					CLK
INT or RCV	EXT, INT or RCV			Recovery
				Clock
Clock Mode	Clock Mode
				Out	FIFO
	(Depending on the					TX Data
	attached network)	RX	TX		Data
					Clock
					Recovery
				FIFO	Clock In
				INT/RCV Clock Mode

Equipment with G.703 interface

Figure B-4 IR-G.703 INT/RCV Mode Timing Block

INT/RCV Mode B-3

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