7
8
Switch S1-8: V.54 Enable / Disable
The setting for switch S1-8 determines whether the Model 1094
will respond when it receives the V.54 sequence. If you suspect the
Model 1094 may be getting tricked into the loopback test by false
detection of user data, you can try setting this to “Disable.”
S1-8
Setting
On
Disabled
Off
Enabled
3.1.2 Switch Set S2
The settings for DIP switches S2-1 through S2-4 determine the
synchronous data rate of the Model 1094. All possible settings (includ-
ing the default) are shown below:
S2-1
S2-2
S2-3
S2-4
Setting
Off
On
On
On
384 kbps
On
Off
Off
Off
768 kbps (default)
4.0 INSTALLATION
Once the Model 1094 is properly configured, it is ready to connect
to the twisted pair interface, to the serial port, and to the power source.
This section tells you how to make these connections.
4.1 CONNECTION TO THE TWISTED PAIR INTERFACE
The Model 1094 supports communication between two terminal
devices at distances to 4.9 miles (7.9 km) and data rates to 768 kbps.
There are two essential requirements for installing the Model 1094:
1.
These units work in pairs. Therefore, you must have one
Model 1094 (or a compatible model) at each end of a two
twisted pair interface.
2.
To function properly, the Model 1094 needs two twisted pairs
of metallic wire. These twisted pairs must be
unconditioned, dry, metallic wire, between 19 and 26 AWG
(.4 mm and .9 mm, inversely) (the higher AWG gauges may
limit distance somewhat). Standard dial-equalization
equipment, or standard, flat modular telephone type cable, are
not acceptable.
4.1.1 TWISTED PAIR CONNECTION USING RJ-45
The Model 1094 uses a modular RJ-45 jack for twisted pair line
connection. The signal/pin relationships are shown below:
RJ-45
SIGNAL
1 ..........................XMT+
2 ..........................XMT-
3 ..........................N/C
4 ..........................GND*
5 ..........................GND*
6 ..........................N/C
7 ..........................RCV+
8 ..........................RCV-
*Connection to ground is optional
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5
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