Specifications

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.
TX
RX
RX Data
TX Data
TX
RX
INT or RCV
Clock Mode
EXT, INT or RCV
Clock Mode
(Depending on the
attached network)
Modem
A
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