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S1-8: V.54 Enable / Disable
The setting for switch S1-8 determines whether the Model 1090 will
respond when it receives the V.54 sequence. If you suspect the Model
1090 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
SWITCH SET S2
The settings for DIP switches S2-1 through S2-4 determine the
synchronous data rate of the Model 1090. All possible settings
(including the default) are shown below:
S2-1 S2-2 S2-3 S2-4 Setting
Off Off Off On 48 kbps
Off Off On Off 56 kbps
Off Off On On *64 kbps
Off On Off Off 72 kbps
Off On Off On 80 kbps
Off On On Off 112 kbps
Off On On On 128 kbps
On Off Off Off 144 kbps
On Off Off On 160 kbps
* Default Setting
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4.0 INSTALLATION
Once the Model 1090 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 1090 supports communication between two terminal
devices at distances to 11 miles and data rates to 160 kbps. There are
two essential requirements for installing the Model 1090:
1. These units work in pairs. Therefore, you must have one
Model 1090 (or a compatible model) at each end of a two
twisted pair interface.
2. To function properly, the Model 1090 needs two twisted pairs
of metallic wire. These twisted pairs must be
unconditioned, dry, metallic wire, between 19 and 26 AWG
(the higher number 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 1090 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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