1. Locate the “511/511E” toggle switch on the front panel of the
1140 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 1140s
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 1140’s built-in “511” generator and detector are working proper-
ly.
5.3 POWER UP
Once the Model 1140 is properly installed, it should operate trans-
parently—as if it were a standard cable connection. Since operating
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.
APPENDIX A
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 - 38.4 Kbps
Distance: 2 miles over continuous fiber
RTS/CTS Delay: Switch-selectable: No delay, 9.0 mS, 79.5 mS
Receiver Sensitivity: -45 dBm
Coupled Power Output: -30 to -36 dBm
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 con-
nectors 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”
11
12