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Appendix E IR-G.703 Interface Module Installation and Operation Manual

E-2 Selecting the IR-G.703 Timing ASM-40 Ver. 1.0

Table E-1. RJ-45 Connector Pinouts

Pin Function

3 RCV (+)

6 RCV (-)

4 XMT (+)

5 XMT (-)

2 GND

E.2 Selecting the IR-G.703 Timing

The IR-G.703 interface module can operate with EXT or INT/RCV timing to match

the clock reference of the ASM-40 modem. The clock selection is made via the JP1

jumper located on the module board (see

Figure E-2

JP1

INT/RCV

EXT

Figure E-2. JP1 Location on the IR-G.703 Board

EXT Timing

The EXT clock 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 E-3

You must configure the IR-G.703 module to the EXT clock if the ASM-40 modem

is also set to the external timing.

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RAD Data comm ASM-20 Spécifications Page 108