40
LDM-144LR
M
ODE
A: TX-FIFO
This mode is used in tail-end applications of G.703 co-directional networks.
In this application, 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 occurring between the two
modems. The buffer is a 2-bit FIFO buffer and is connected as shown in
Figure A-3
.
Figure A-3. TX-FIFO Block Diagram.
Timing Source
TX Data
TX
TX
RX
RX
RX Data
G.703
Co-directional
64 kbps network
Buffer
EXT Clock Mode
RCV Clock Mode
Clock In
Clock
Out
Modem A
Modem B
Clock
Recovery
Data
Clock
Recovery
IR-G.703 Module
Clock
Recovery
