Composite Video
USER’S MANUAL
3400 Series
WORLD HEADQUARTERS
55 Cabot Court
Hauppauge, N.Y. 11788 USA
Tel: (631) 273-0404
Fax: (631) 273-1638
www.commspecial.com
Email:
info@commspecial.com
Communications Specialties Pte Ltd
100 Beach Road
#22-09 Shaw Tower
Singapore 189702
Tel: +65 6391 8790 Fax: +65 6396 0138
Email:
csiasia@commspecial.com
P/N: 122230 Rev.
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 Communications Specialties - Pure Digital Fiberlink 3400 Series Manual
TABLE OF CONTENTS
General Information .................................................... 2
Introduction ............................................................ 2
Technical Specifications .......................................... 2
Installation Instructions .............................................. 4
Installation Procedure ............................................. 4
Indicator LEDs and Alarm Circuitry ...................... 5
Operating Pointers and Trouble Shooting .................. 6
Optical Fiber ........................................................... 6
Trouble Shooting .................................................... 6
Maintenance ............................................................... 7
Statement of Limited Warranty .................................. 8
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 Communications Specialties - Pure Digital Fiberlink 3400 Series Manual
GENERAL INFORMATION
Introduction:
The Pure Digital Fiberlink
®
3400 Series is an adjustment-free
transmitter/receiver pair that transmits a single channel of com-
posite video over single mode or multimode fiber. A dual channel
rack card version is also available, which transmits two indepen-
dent channels over two separate fibers on one card.
The use of digital encoding assures high-quality noise-free trans-
missions that retain all of their initial parameters, regardless of
fiber optic cable attenuation. In addition, an integral indicator LED
is provided on each unit to continuously signify the presence of an
optical signal and thus, the proper operation of each side of the
system.
Technical Specifications:
Model Part Numbering Configurations:
Unit Type
Single Channel Transmitter Box
Single Channel Transmitter Rack Card
Dual Channel Transmitter Rack Card
Single Channel Receiver Box
Single Channel Receiver Rack Card
Dual Channel Receiver Rack Card
X Values: 1=850 nm MM
3=1310 nm MM
7=1310 nm SM
9=1550 nm SM
2
Part Number
3400-Bxy
3400-Cxy
3402-Cxy
3401-Bxy
3401-Cxy
3403-Cxy
Y Values: S=ST connector
F=FCPC connector
 Communications Specialties - Pure Digital Fiberlink 3400 Series Manual
Video
Bandwidth ............................ 8MHz (-3dB)
Input/Output Impedance ....... 75 Ohms
Input/Output Voltage ............ 1 V p-p nom., 1.1 V p-p max.
Differential Phase ................. 1
o
typical
Differential Gain ................... 1% typical
Signal-to-Noise Ratio ........... 67dB NTSC / 62dB PAL/SECAM
(CCIR weighted)
Signal Connectors ................ BNC
Optical
Operating Wavelength .......... 850nm, 1310nm, 1550nm 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
0-3
1310 MM
0-12
0-12
1310 SM
0-27
0-50
1550 SM
0-27
0-60
*Distance specifications are only approximate and are not guar-
anteed. Operating loss budget must not be exceeded.
Miscellaneous:
Operating Temp. Range ....... -35 to +75 degrees C
Operating Power ................... 9-24 Volts AC or DC@5 watts (max)
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 Communications Specialties - Pure Digital Fiberlink 3400 Series Manual
CAUTION! The transmitting element in some versions of the Pure Digital
Fiberlink transmitter unit is a solid-state Laser Diode located in the optical connector
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.
INSTALLATION INSTRUCTIONS
Installation Procedure
The 3400 Series transmission systems are preset for immediate
use. The following instructions describe the typical installation pro-
cedure and the function of the LED indicators located on each unit.
1. Connect the video source to the video input
BNC connector on the transmitter unit. If
using the dual channel card version, connect
both video inputs.
2. Connect the video output BNC(s) on the
receiver unit to the coax cable BNC connector(s).
3. Connect the fiber optic cable or cables between the two units.
4. Apply power to both Pure Digital Fiberlink units. Refer to Figure 1
for DC power connections.
5. When power is applied, the green POWER LED will light, indi-
cating the presence of operating power. On box units, the LINK
LED will give an indication as stated below. On card units, the
VIDEO LED will give an indication as stated below. (Dual channel
cards feature two LEDs - one corresponding to each channel.)
6. The system should now be operational.
Note that the rack card version will have an additional red LED for
indicating the presence of an alarm condition (loss of video).
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 Communications Specialties - Pure Digital Fiberlink 3400 Series Manual
Indicator LEDs and Alarm Circuitry
Following is a description of the various conditions indicated by the
system’s LEDs:
TRANSMITTER and RECEIVER:
Power:
ON: (Green) Indicates that correct power has been
applied
TRANSMITTER:
Link or
OFF: Indicates no video detected on input BNC.
Video:
STEADY GREEN: Indicates video detected on input BNC.
Alarm:
ON: Loss of video (rack card only)
RECEIVER:
Link or
OFF: Indicates no video detected over fiber and, as a
Video:
result, no video present on output BNC
STEADY GREEN: 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)
Alarm Switch Settings (Transmitter; Card Version Only)
Switch Position
1
2
Switch Position
1
2
Alarm Indication
Loss of Video 1
Loss of Video 2
Alarm Indication
Loss of Signal
Loss of Signal
On
Enabled
Enabled
On
Enabled
Enabled
Off
Disabled
Disabled
Off
Disabled
Disabled
Alarm Switch Settings (Receiver; Card Version Only)
Note: “Loss of Video” refers to the loss of the respective video input.
“Loss of Signal” refers to the absence of either optical signal.
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 Communications Specialties - Pure Digital Fiberlink 3400 Series Manual
OPERATING POINTERS AND
TROUBLE SHOOTING
Optical Fiber:
The 3400 Series is 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. As a result, the key word is cleanli-
ness. 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 the LINK indicator LEDs should provide the first
clue as to the origin of any operational failure. If a LINK LED is off,
it usually means that the fiber is broken or has too much attenuation.
Next, be certain that the input and output signal connections are
proper.
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 Communications Specialties - Pure Digital Fiberlink 3400 Series Manual
Finally, although multimode and single mode devices may look
the same, they will not operate properly together. Using the wrong
device or fiber can easily add more attenuation than specified,
resulting in poor overall performance.
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 3400 Series transmission units have
been manufactured using the latest semiconductor devices and tech-
niques 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 encountered, Com-
munications Specialties maintains a complete service facility to
render 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 transmission 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 the many “prob-
lems” can easily be solved by a simple telephone call.
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 Communications Specialties - Pure Digital Fiberlink 3400 Series Manual
LIMITED WARRANTY
Communications Specialties, Inc. (CSI) warrants that for a period of
three years after purchase by the Buyer, the Pure Digital Fiberlink 3400
Series Transmission System will be free from defects in material and work-
manship under normal use and service. A Return Material Authorization
(RMA) number must be obtained from CSI before any equipment is re-
turned by the Buyer. All material must be shipped to CSI at the expense and
risk of the Buyer. CSI’s obligation under this warranty will be limited, at its
option, to either the repair or replacement of defective units, including
free materials and labor. In no event shall CSI be
responsible for any incidental or consequential damages or loss of profits
or goodwill. CSI shall not be obligated to replace or repair equipment that
has been serviced by unauthorized personnel, altered, improperly installed
or abused.
RMA numbers and repairs can be obtained from:
Communications Specialties, Inc.
55 Cabot Court
Hauppauge, NY 11788 USA
Tel: (631) 273-0404 Fax: (631) 273-1638
www.commspecial.com
Email: info@commspecial.com
Or, in the Asia Pacific Region:
Communications Specialties, Inc.
100 Beach Road
#22-09 Shaw Tower
Singapore 189702
Tel: +65 6391 8790 Fax: +65 6396 0138
Email: csiasia@commspecial.com
Please have your serial number (located on the top label of the unit)
available when contacting us.
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