RAD Data comm ASMi-31 - Manual (Page 50)

Appendix B. IR-G.703 Codirectional Interface (64 kbps) ASMi-31 Installation and Operation Manual
B-2 EXT Mode 16-03-00 17:21
LINE FUSE
G.703
XMT RCV GND
2 4 5
GND
LINE
1 8
Terminal Block
(Standalone)
RJ-45
(Standalone)
DB-25
(Rack Version)
XMT (4, 5)
RCV (3, 6)
GND (2)
(9,11) RCV
(2,16) XMT
(7) GND
2
7
16
9
11
230 V/0.1A T 250V
Figure B-1 IR-G.703 Connector Options
Note In Figure B-1, RCV refers to the input signals to the interface module;
XMT refers to the output signals from the module.
The IR-G.703 interface module is shown in Figure B-2. It has two operation
modes which are selectable on the PCB board. The selection is made by
means of the JP1 jumper located within the module as shown in Figure B-2.
The EXT mode is described in EXT Mode below and illustrated by Figure B-3.
The INT/RCV mode is described in INT/RCV Mode below and illustrated by
Figure B-4.
Note The IR-G.703 interface should be in accordance with the modem clock
mode. For example, if the modem is in the EXT mode, then JP1 should be set
to the EXT position.
INT/RCV
JP1
EXT
Terminal Block
or RJ-45
(Standalone Version)
Figure B-2 Location of JP1 on the IR-G.703 Interface Module
B.3 EXT Mode
This mode 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 B-3.
This mode corresponds to the modem clock working in the EXT mode.
Order from: Cutter Networks Ph:727-398-5252/Fax:727-397-9610 www.bestdatasource.com