RAD Data comm ASM-20 EXT Mode, Figure B-2 Location of JP1 on the IR-G.703 Interface Module

Appendix B. IR-G.703 Codirectional Interface (64 kbps) ASM-20Installation and Operation Manual

Note

Note

Figure B-1 IR-G.703 Connector Options

In Figure B-1, RCV refers to the input signals to the IR 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 on page B-2and illustrated by Figure B-3. The INT/RCV mode is described in INT/RCV Mode on page B-3and 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.

TE R M IN A L B LO C K

O R R J-45

(S TA N D A LO N E V ER S IO N )

IN T /R C V

J P1

E XT

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.

B-2 EXT Mode