Specifications

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Page 9
Installation
3. INSTALLATION
Once the ME670A is properly configured, it is ready to connect to your system. This
section tells you how to connect the ME670A to the twisted pair and RS-232 inter
-
faces.
3.1 CONNECTION TO THE TWISTED PAIR INTERFACE
The ME670A supports data-only communication between two RS-232 devices at dis-
tances to 12 miles (19.2) and data rates to 38.4 Kbps. There are two essential require-
ments for installing the ME670A:
• These units work in pairs. Therefore, you must have one ME670A (or a compat-
ible model) at each end of a two twisted pair interface.
• To function properly, the ME670A needs two twisted pairs of metallic wire. These
pairs must be unconditioned, dry, metallic wire, between 19 and 26 AWG (the
higher number gauges may limit distance somewhat). Standard dial-up tele
-
phone circuits or leased circuits that run through signal equalization equipment
are not acceptable.
Twisted Pair Connection Using RJ-11 OR RJ-45
The RJ-11/RJ-45 combo jack connectors on the ME670A's twisted pair interface are
pre-wired for a standard TELCO wiring environment (see
Figure 3). The signal/pin
relationships are shown on the table on the following page.
Figure 3. RJ-11/RJ-45 Combo Jack
Note Both RJ-11 and RJ-45 plugs will insert into the jack, shown in Figure 3.
1- No Contact
2 - Blue
3 - Yellow
4 - Green
5- Red
6 - Black
7 - White
8 - No Contact