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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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