Specifications

Installation and Operation Manual Appendix D IR-G.703/CO Interface Module
ASMi-31 Ver. 3.0 Selecting the IR-G.703/CO Timing D-3
INT/RCV Timing
The INT/RCV clock is used in applications where the G.703 codirectional 64 kbps
equipment connected to the modem recovers the clock signal from the modem
link. This mode is used mainly when the attached equipment has a G.703
codirectional interface, but is not able to produce clock signals. The module has
an 8-bit FIFO buffer to compensate for the phase delay introduced by the G.703
device.
Figure D-4 illustrates the buffer connection and the required application
setup.
You must configure the IR-G.703/CO module to the INT/RCV clock if the ASMi-31
modem is set to the internal or receive timing.
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 D-4. IR-G.703/CO INT/RCV Timing