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OPERATING POINTERS AND TROUBLESHOOTING
Optical Fiber:
The 7030 and 7040 Series are available in versions that operate with
most multimode (MM) and single mode (SM) optical fibers. Be certain
that the correct size fiber is being used for the particular transmitter/
receiver combination.
Also be certain that the attenuation and bandwidth of the fiber optic
cable being used is within the range of the system’s loss budget
specifications.
Troubleshooting:
Multimode fiber optic cable contains an optical fiber with a light
carrying “core” that is only .0025 inches (62.5 microns) in diameter.
Single mode fiber optic cable has an even smaller “core”, only .00032 to
.0004 inches (8-10 microns). This is smaller than a human hair! As a
result, any minute particles of dirt or dust can easily block the fiber
from accepting or radiating light. Therefore, cleanliness is imperative!
Always use the dust caps provided with all optical connectors
whenever they are exposed to air. Also, it is a good idea to gently clean
the tip of an optical connector with a lint-free cloth moistened with
alcohol whenever dust is suspected.
The status of any of the indicator LEDs should provide the first clue
RECEIVER:
Video: OFF: Indicates no video detected over fiber and, as a result,
no video present on output BNC
ON: Indicates video detected over fiber and, as a result,
video present on output BNC
Alarm: ON: Loss of input video or optical signal (rack card only)
Video
Bandwidth ............................ 7 MHz (-3dB)
Input/Output Impedance ...... 75 Ohms
Input/Output Voltage ............ 1 Vp-p nom., 1.1 Vp-p max.
Differential Phase & Gain ..... 0.5otypical; 1.0% typical
Signal-to-Noise Ratio ............ 62 dB CCIR weighted
Signal Connectors ................. BNC
Miscellaneous
Operating Temp. Range ........ -35 to +75 degrees C
Operating Power ................... 9 to 24 Volts AC or DC@5 watts (max)
Optical
Operating Wavelength ........... 850 nm, 1310 nm, 1550 nm, MM/SM
Optical Fiber ......................... 62.5/125 microns MM or
.......................................... 8-10/125 microns SM
Optical Connectors ............... ST or FCPC
Wavelength Loss Budget (in dB) Distance* (in km)
850 MM 0-20 0-.75
1310 MM 0-25 0-2
1310 SM 0-25 0-60
1550 0-25 0-80
*Note: Distance specifications are only approximate and are not
guaranteed. Operating loss budget must not be exceeded.
CAUTION! Some versions of the Pure Digital Fiberlink transmitter unit
contain a solid state Laser Diode located within the optical connector.
This device emits invisible infrared electromagnetic radiation which
can be harmful to human eyes. The radiation from this optical connec-
tor, if viewed at close range without a fiber optic cable connected to the
optical connector, may be of sufficient intensity to cause instantaneous
damage to the retina of the eye. Direct viewing of this radiation should
be avoided at all times.
