Video:
Bandwidth (-3 dB) ......................... 20 Hz to 8 MHz
Input/output Impedance ................. 75 Ohms
Input/output Voltage...................... 1 V p-p nom., 1.3Vp-p max.
Differential Phase .......................... 1° typical
Differential Gain ............................ 1.5% typical
Signal to Noise Ratio ..................... 60 dB CCIR weighted
Signal Connectors .......................... BNC
Optical:
Operating Wavelength ................... 850nm, 1310nm, 1550nm MM/SM
Optical Fiber .................................. 62.5/125microns MM or
8-10/125 microns SM
Optical Connectors ........................ ST or FCPC
1 Fiber 2 Fibers 1 Fiber 2 Fibers
Wavelength Loss Budget (in dB) Distance* (in km)
850 MM N/A 0-18 N/A 0-2
1310 MM 0-10 0-15 0-5 0-15
1310 SM 0-19 0-20 0-45 0-50
1550 SM 11-26 11-28 40-65 35-90
*Note: Distance specifications are only approximate and are not guaranteed.
Operating loss budget must not be exceeded.
Misc:
Operating Temperature Range....... -35 to +75 degrees C
Operating Power ............................ 9 to 24 Volts AC or DC @ 8 watts (max)
3
CAUTION! The transmitting element in some versions of the Pure Digital Fiber-
link transceiver unit is a solid-state Laser Diode located in the optical connec-
tor on the unit. This device emits invisible infrared electromagnetic radiation
which can be harmful to human eyes. The radiation from this optical connector,
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.
If, after reviewing the above possibilities, the system is still not operating, please
contact the Customer Service Department for further assistance
MAINTENANCE
The Pure Digital Fiberlink 3800 Series transmission units have been manufac-
tured using the latest semiconductor devices and techniques that electronic
technology has to offer. They have been designed for long, reliable, and trouble
free service and are not normally field repairable. Should difficulty be encoun-
tered, Communications Specialties maintains a complete service facility to ren-
der accurate, timely and reliable service of all products.
The only maintenance that can be provided by the user is to ascertain that
optical connectors are free of dust or dirt that could interfere with light trans-
mission and that electrical connections are secure and accurate.
All other questions or comments should be directed to our Customer Service
Department. It should be noted that many “problems” can easily be solved by
a simple telephone call.
10
multidrop mode. If this problem occurs, it may be that
your units are attempting to interface with other manu-
facturers’ products that have resting states opposite to
the way in which the Fiberlink units are programmed.
(No standard exists.) You can compensate for this
condition by simply switching the polarities of the (+)
and (-) pins. To do this, first swap the Tx (+) and Tx (-)
pins with one another and then do the same for the Rx
(+) and Rx (-) pins. Make sure to do this on both the
transmitter and receiver units.
