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GENERAL INFORMATION
Technical Specifications
System Protocol ............................................. EIA RS-232
System Data Rate .......................................... DC to 100 Kb/s, Asynchronous
Optical Loss Budget ...................................... 62.5u MM Fiber, 0-15 dB
8/10u SM Fiber, 0-17 dB
Transmitter Launch Power (Typical) ............ 850 nm MM, 40 uw (-14 dBm)
1300 nm MM, 40 uw (-14 dBm)
1300 nm SM, 60 uw (-12 dBm)
Receiver Sensitivity (Typical) ....................... 850/1300 nm, 1uw (-30 dBm)
Operating Opitcal Wavelength ...................... 850 nm or 1300 nm
Optical Connectors ........................................ Multimode, ST
Single mode, ST or FCPC
Anti-Streaming Timeout Range .................... 4,8,16,32 or 64 seconds
Operating Temperature Range ...................... -37 to +74 degrees, Celcius
Battery Backup Operating Interval................ 12 hours
Introduction
The FIBERLINK XRD-8050 is a fiber optic transceiver designed to implement a
digital master/local data bus for traffic signal controller networks using
CALTRANS 170 or 179 series, or NEMA style controllers. The transceiver is
normally connected in a “daisy-chained” linear multidrop configuration mounted
external to the controller. A rack mountable version, the XRD-8050/RK is also
available for use in an MCR-2000 universal card cage enclosure.
The XRD-8050 is fully compatible with EIA standard RS-232 and will accommo-
date any duty cycle or code format. In addition, a user adjustable anti-streaming
time-out feature is included as well as an internal back-up battery (in the stand-
alone version) for continuous operation during a loss of prime operating power.
The XRD-8050 contains signal indicator LEDs for continuous monitoring of all
data transmitting and receiving functions.
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B. Check Optical Connectors
1. Is the correct connector being used for the type of fiber optic cable
employed? Some multimode connectors look the same as their single-
mode counterparts at first glance.
2. Are the ends of the connectors free from all dust or dirt? If not, gently
clean the ends with a clean cloth moistened with alcohol.
3. Is the fiber broken in the connector? A quick inspection with an
inexpensive 10X jeweler’s loop can determine this.
4. Is the fiber protruding from the tip of the optical connector? If so,
refinishing will be necessary.
C. Check Fiber Optic Cable
1. Is the correct fiber size being used with the correct
transmitter/receiver combination?
2. Does the fiber optic cable have too much attenuation (loss) for the
system?
3. Does the fiber optic cable pass light at all? A small penlight type
flashlight can usually be used for this test.
4. Is the fiber optic cable pulled too tightly around a sharp corner?
D. Check Receiver (or receiving section of a transceiver)
1. Is the operating power (DC, AC, Voltages) correct?
2. Are the pins being used on the connector or terminal block correct?
3. Is light coming out of the fiber optic cable? This may be difficult to
see in many cases, but sometimes a very dim glow is present. Note
that you can only see 850nm light. Light at 1300nm is invisible.
4. Is the optical connector on the receiver clear of any obstruction or
minute dirt particles?
5. Does the fact that signal ground, power ground and the housing are
common cause a short-circuit anywhere in the system?
