C. Two-Wire Connection Using Coax.
When using coax for two-
wire connection, the coax cable should be terminated with male
BNC connectors. Simply twist these onto the female connectors
on the Model 1003/1003S units and start computing!
D. Two-Wire Connection Terminal Blocks and Strain Relief.
Model 1003 and 1003S modems that are not equipped with coax
connectors or modular jacks allow for two-wire connection via
internal
terminal blocks. An
external
strain relief collar--integrated
into the plastic case--holds the cable securely in place so that it
won't pull loose from the terminal block connections. Follow these
step-by-step instructions to wire up the Model 1003/1003S using
the terminal block/strain-relief assembly:
1.
Open the plastic case by gently inserting a screw driver
between the DB-25 connector and the lip of the plastic case.
There is no need to worry about breaking the plastic--just be
careful not to bend the metal DB-25 connector.
6
A. Connecting to the RS-232 Interface.
The Model 1003 and 1003S
are designed to plug
directly
into the DB-25 (RS-232) interface of
a terminal or modem. Connection may also be made using a short
RS-232 cable. Note: The connecting cable must have at least
pins 2,3 and 7 wired STRAIGHT THROUGH. For best results, this
cable should be as short as possible.
B. Two-Wire Connection Using RJ-11 and RJ-45 Jacks.
When
using the RJ-11 or RJ-45 modular jacks for two-wire connection, it
is necessary to employ "straight through" cabling between the
modems. Pin-outs are shown below:
RJ-11 Wiring
Modem #1
Modem#2
SIGNAL
PIN# COLOR*
COLOR*
PIN#
SIGNAL
DATA
3
Green
Green
3
DATA
GND
4
Red
Red
4
GND
RJ-45 Wiring
Modem #1
Modem#2
SIGNAL
PIN# COLOR*
COLOR*
PIN#
SIGNAL
DATA
4
Red
Red
4
DATA
GND
5
Green
Green
5
GND
* Standard Color Codes - Yours may be different
AT&T Standard pins/colors
5
1 - Blue
2 - Yellow
3 - Green
4 - Red
5 - Black
6 - White
1 - Blue
2 - Orange
3 - Black
4 - Red
5 - Green
6 - Yellow
7 - Brown
8 - Slate
