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5.2.3 USING THE V.52 BER TEST INDEPENDENTLY
The V.52 BER test can be used independently of the V.54 loop-
back tests. This requires two operators: one to initiate and monitor the
test at the local Model 1140A, and one at the remote Model 1140A. To
use the V.52 BER test by itself, both operators should simultaneously
follow these steps:
1. Locate the "511/511E" toggle switch on the front panel of the
1140A and move it DOWN. This activates the V.52 BER test mode and
transmits a "511" test pattern to the other unit. If any errors are pres-
ent, the receiving modem's red "Error" LED will blink sporadically.
Note: For this test to function, the "511" switch on both Model 1140As
must be on.
2. If the test indicates no errors are present, move the V.52 toggle
switch UP, activating the "511/E" test with errors present. If the test is
working properly, the receiving modem's red "Error" LED will glow. A
successful "511/E" test will confirm that the link is in place, and that the
Model 1140A's built-in "511" generator and detector are working prop-
erly.
5.3 POWER UP
Once the Model 1140A is properly installed, it should operate
transparently—as if it were a standard cable connection. Since operat-
ing power is derived from the RS-232 data and control signals; there is
no "ON/OFF" switch. All data signals from the RS-232 interface are
passed straight through.
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APPENDIX A
PATTON ELECTRONICS MODEL 1140A
SPECIFICATIONS
Transmission Line:
Dual optical cable
Transmission Mode:
Async. or sync., half or full duplex
Interfaces:
EIA RS-232, CCITT V.24
Data Rates:
0 - 57.6Kbps
Distance:
3.5 miles over continuous fiber
RTS/CTS Delay:
Switch-selectable: No delay, 9.0 mS,
79.5 mS
Receiver Sensitivity:
-38 dBm
Coupled Power Output: > -25dBm
Optic Wavelength:
850 nm
LED Indicators:
Carrier Detect and Fiber Optic Output
Connectors:
DB-25 male or female on RS-232 side; ST
or SMA connectors on fiber side
Power Supply:
No external power required; uses power
from RS-232 data and control signals
Temperature Range:
0-60°C (32-140°F)
Altitude:
0-15,000 feet
Humidity:
Up to 95% non-condensing
Weight:
2 oz.
Dimensions:
23.42" x 2.10" x 0.73"
12
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