RAD Data comm ASMi-31 EXT Mode, Terminal Block RJ-45 DB-25 Standalone Rack Version

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

LINE FUSE	G.703
	230 V/0.1A T 250V GND XMT RCV

LINE

GND

2 4 5

RCV (3, 6)

GND (2) XMT (4, 5)

1 8

(9,11) RCV	2
(2,16) XMT
(7) GND	7
	9
16	11

Terminal Block	RJ-45	DB-25
(Standalone)	(Standalone)	(Rack Version)

Note

Note

Figure B-1 IR-G.703 Connector Options

In Figure B-1, RCV refers to the input signals to the interface module; XMT refers to the output signals from the module.

The IR-G.703 interface module is shown in Figure B-2. It has two operation modes which are selectable on the PCB board. The selection is made by means of the JP1 jumper located within the module as shown in Figure B-2. The EXT mode is described in EXT Mode below and illustrated by Figure B-3. The INT/RCV mode is described in INT/RCV Mode below and illustrated by Figure B-4.

The IR-G.703 interface should be in accordance with the modem clock mode. For example, if the modem is in the EXT mode, then JP1 should be set to the EXT position.

Terminal Block

or RJ-45

(Standalone Version)

INT/RCV

JP1

EXT

Figure B-2 Location of JP1 on the IR-G.703 Interface Module

B.3 EXT Mode

This mode is used in applications, where the system timing is provided by the G.703 network. The IR-G.703 module has an internal buffer to compensate for the phase delay introduced to the system by the line delay between the two modems. The buffer is an 8-bit FIFO connected as shown in Figure B-3.

This mode corresponds to the modem clock working in the EXT mode.

B-2 EXT Mode

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