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FOM-40 Installation and Operation Manual Appendix C IR-G.703/CO Interface Module

Selecting the IR-G.703/CO Timing C-3

INT/RCV Timing

The INT/RCV clock is used in applications that recover the clock signal from the

modem link. This mode is used when the attached equipment has a G.703

codirectional interface but cannot produce clock signals. The module has an 8-bit

FIFO buffer to compensate for the phase delay introduced by the G.703 device.

Figure C-4 illustrates the buffer connection and the required application setup.

If the FOM-40 modem is set to the internal or receive timing, configure the

IR-G.703/CO module to the INT/RCV clock.

RX Data

TX Data

INT or RCV

Clock Mode

EXT, INT or RCV

Clock Mode

(Depending on the

attached network)

Modem

Equipment

with G.703

Interface

LINK

Side

G.703

Side

DTE

Side

INT/RCV Clock Mode

Modem B

Clock In

Clock

Out

IR-G.703 Module

Data

Clock

Recovery

FIFO

Clock

Recovery

Data

CLK

FIFO

Figure C-4. IR-G.703/CO INT/RCV Timing

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 73 74

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