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INSTALLATION INSTRUCTIONS FOR XRD-8050
Installation Procedure
The following procedure is intended to simplify the installation of the XRD-
8050 unit. Be sure to follow all steps carefully and to double check all connec-
tions. Specific details regarding the various functions follow this procedure.
1) Connect the traffic signal controller to be used to the DB-25S signal
connector on the XRD-8050. The mating plug is a standard DB-25P and the
pin connections are tabulated in the “SIGNAL CONNECTIONS” section
that follows.
2) Connect operating power to the 3 position terminal block on the XRD-8050
as per the information in the “POWER SUPPLY CONNECTIONS” section
that follows.
3) Remove the top cover on the unit and set the ANTI-STREAMING and
MASTER/LOCAL switches as required per the information in the appropri-
ate section that follows.
4) Connect the XRD-8050 units being used together with fiber optic cable. Be
certain that the proper “transmit” (T1 or T2) connector of one unit is
connected to the proper “receive” (R1 or R2) connector of the other units.
Note the information in the “OPTICAL FIBER” section that follows.
5) The system should now be operational.
All that is required for normal operation of the FIBERLINK XRD-8050 stand-
alone unit is to connect signal, power and the fiber optic cables between units
and to set the internal DIP switches for the correct mode of operation.
Note that the transmitting element in the “-7”
single-mode version of the XRD-8050 uses a solid
state Laser Diode located in the optical connector on
the unit. This device emits invisible infra-red radiation
which may be harmful to human eyes. As a result,
direct viewing of this radiation should be avoided.
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OPERATING CONSIDERATIONS FOR
FIBER OPTIC CABLE
The XRD-8050 may be supplied with ST, FCPC or single-mode ST type optical
connectors and will operate with most common fiber optic cables.
Since the XRD-8050 can be provided for operation at a wavelength of 850nm or
1300nm, the fiber optic cable employed should be chosen so that it is optimized
for operation at the appropriate wavelength.
When using any type of fiber optic cable be certain to not cause excessive
strains especially at the cable-to-connector junction. Also, do not subject the
cable to sharp bends or pull around sharp corners. Whenever possible, service
loops or extra slack should be provided in any installation. While excessive
precautions are not necessary, fiber optic cable does contain thin, fragile strands
of glass and as such should be treated with moderate care.
Notes Regarding Fiber Optic Cable
Multimode fiber optic cable contains an optical fiber with a light carrying “core”
that is only 0.0025 inches (62.5u) in diameter. Single-mode fiber optic cable has an
even smaller “core”, only 0.00032 to 0.0004 inches (8-10u). This is smaller than a
human hair! Any minute particle of dirt or dust can easily block this fiber from
accepting or radiating light.
As a result, the key word is cleanliness.
Always use the
dust caps provided with optical connectors whenever they are exposed to air. Also,
always try to gently clean the tip of an optical connector with alcohol whenever
dust is suspected.
Mechanical butt splices or optical feedthroughs must be installed properly. Multi-
mode devices will not operate properly with single-mode connectors even though
they may look the same. Using the wrong device can easily add more optical
attenuation than specified with the result that system performance can be compromised.
Attempting to use multimode fiber with a single-mode system will usually result in
overloading of the fiber optic receiver with the result that the system will produce
distorted output signals or simply not work at all. Using single-mode fiber with a
multimode system will result in not enough light reaching the receiver with the
result that the transmission distance will be greatly reduced and in some cases, the
system will not operate at all.
As a result, always use the fiber optic cable the system is specifically designed for.
