Page 1
World Headquarters
55 Cabot Court
Hauppauge, New York 11788 USA
Tel: (631) 273-0404
Fax: (631) 273-1638
info@commspecial.com
commspecial.com
Single Color (Black)
Fiberlink®
3620A Series
Composite Video and Two Channels of Audio
over one single mode or multimode ber.
Communications Specialties’ Fiberlink® 3620A User’s Manual
Quality composite video and
two channels of stereo audio
delivered over one single mode
or multimode ber optic core.
Fiberlink 3620A is feature rich
with10Mhz video bandwidth,
balanced or unbalanced audio
controls and user selectable audio
gain from 0 to +6 dB. All digital
processing with no equalization,
deskewing or other conguration
required!
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Page 2 Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Contents
Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Package Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Technical Specications
Model Part Number Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Video Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Audio Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operating Loss Budgets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Maximum Useable Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Alarm Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Audio Conguration (Transmitter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Audio Conguration (Receiver) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Audio Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Indicator LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Operating Pointers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance and Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Certications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Accessories and Related Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Contents
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Page 3Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Welcome
Thank you for purchasing Communications Specialties, Inc.’s Fiberlink® 3620A Series. The
3620A Series is used to transmit Composite Video over a single ber optic core as well as 2
channels of audio. The Fiberlink 3620A series is compatible with single mode or multimode
ber. The system utilizes all digital processing to deliver noise-free transmission. The 3620A
series is a cinche to install with no equalization, deskewing or special tools required.
Features
• 10 MHz video bandwidth per channel
• Video channel is compatible with NTSC, PAL or SECAM video standards
• Two audio channels that may be user-congured for balanced or unbalanced
inputs and outputs
• Switch selectable audio output gain boost of +0 dB or +6 dB
• Indicator LEDs monitor power, video and audio signals
• Transmits over one multimode or single mode ber
• No adjustments; pure digital processing and transmission
• Wide range power supply allows operation from both AC and DC sources
• System consists of transmitter and receiver unit; card or box version.
• Card version lls one slot in 6000A card cage
Package Contents
• One Fiberlink® 3620A or 3621A
• This User’s Manual
Welcome | Features | Package Contents
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Page 4 Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Model Part Number Specication
Unit Type Part Number
Transmitter Box 3620A-B7S
Transmitter Rack Card 3620A-C7S
Receiver Box 3621A-B7S
Receiver Rack Card 3621A-C7S
General Specications
Indicators
Power, Video, Audio,
Alarm (Card version)
Box Version Dimensions 5 W x 1.15 H x 5.25 L (inches)
127 W x 29 H x 203 L (mm)
Weight approx. 10 oz.; 0.284 kg
Number of slots in 6000A card cage 1
Power 9-24 volts AC or DC, 3.5 watts
11.94 BTU/Hr
(Transmitter or Receiver)
Operating Temperature -10º to +60º C
Operating Wavelength 1310nm
Optical Connector ST
Video Specications
Frequency Response 10 MHz (-3 dB), ±0.2 dB to 5 MHz
Input/Output Impedance 75 Ohms, nominal
Signal-to-Noise Ratio 60 dB (CCIR weighted)
Dierential Gain 0.5%
Dierential Phase 0.5º
Y/C Delay < 10 ns
2T K-Factor 0.5%
System Gain Unity Gain, ± 3%
Video Connector BNC
Technical Specications
Technical Specications
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Page 5Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Audio Specications
Number of Audio Channels 2, balanced or unbalanced
Bits per sample/ Sampling Rate 24 bits, 52 kHz
Audio Connector Screw terminal block
Switches • Select input termination
• Balanced or unbalanced
input/output, selectable on a
per-channel basis
• Output gain boost +0 dB or +6 dB
Frequency Response +0/-0.5 dB, 20 Hz - 20 kHz
Maximum Audio Level +10 dBu
Signal-to-Noise Ratio (A-weighted) 95 dB referenced full scale (balanced)
THD 0.002%, 20Hz - 20 kHz, full scale
Channel Phase Dierential ±0.1º
Crosstalk -100 dB (1kHz)
Audio Noise Level -85 dBm
System Gain Unity Gain, ±3%, input: balanced
600 ohms, 50 ohms source
impedance ; output: balanced into
600 ohms, gain boost 0 dB.
Receiver Output Gain +0 dB or +6 dB; switch selectable
Input Impedance 600 Ohms terminated,
>24K ohms unterminated
Output Impedance 50 Ohms nominal
Audio to Video Di. Delay (skew) <300 usec
Technical Specications
Technical Specications
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Page 6 Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Optical Loss Budget & Maximum Useable Distance
Fiber Type Loss Budget Distance
Single Mode Fiber 0-17 dB 40km
Multimode Fiber (62.5u) 0-20 dB 7.5km
Multimode Fiber (50u) 0-20 dB 5km
*Distance specications are approximate and are not guaranteed.
Operating loss budget must not be exceeded.
Alarm Switch Settings for the Transmitter Card
Switch Position Alarm Indication On O
1 Loss of Input Video Enabled Disabled
2 N/A N/A N/A
Alarm Switch Settings for the Receiver Card
Switch Position Alarm Indication On O
1 Loss of Optical Signal Enabled Disabled
2 Loss of Input Video Enabled Disabled
Alarm Switch Settings & Options
The Rack Card version of this product has an additional red indicator LED that illuminates
when an alarm condition exists.
The rack card unit also provides an output to drive a model 6020A Alarm Sensing Module
which provides an audible tone and activates a set of contacts for external signaling
purposes.
Optical Loss Budgets | Alarm Switch Settings
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Page 7Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
9-24 Volts
AC or DC
( - ) Negative
(+) Positive
Installation Instructions
The Fiberlink® 3620A Series of ber optic transmission systems are ready for
immediate use and do not require any special tools or equipment. However, an Optical
Power Meter, such as the Fiberlink® 6615, can be useful in determining optical loss budgets
during your systems design and maintenance.
The following instructions describe the typical installation procedure:
1) Connect the video source to the video input BNC connector on the transmitter unit.
2) (Optional) Connect your audio source to the audio input on the transmitter unit.
3) Connect the video output cable to the video output BNC connector on the
receiver unit.
4) (Optional) Connect audio ouput cable to the audio ouput on the receiver unit.
6) Connect the ber optic cable to the transmitter and receiver units.
7) Connect the Universal Power Supply to the transmitter and receiver units.
For box versions using DC power, please refer to gure 1.
8) Congure your audio preferences as described in the Audio Conguration
section of this manual.
9) When power is applied, the green POWER LED should illuminate, indicating the
presence of operating power. The Video and the Audio LEDs will give an indication
as described in the Indicator LED’s and Alarm Circuitry section of this manual.
10) The system should now be operational.
Note: The Rack Card version has an additional red LED for indicating the presence of an alarm
condition (loss of signal). Refer to Indicator LED’s and Alarm Circuitry sections of this manual.
Installation Instructions
The transmitting element in the Fiberlink® 3620A transmitter
unit contains a solid state Laser Diode located in the optical
connector. 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
with no ber optic cable connected to the optical
connector, may be sucient intensity to cause
instantaneous damage to the retina of the eye. Direct
viewing of this radiation should be avoided at all times!
Figure 1:
Power Connector
DC Input Polarity
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Page 8 Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Channel 2
Controlled by
Switches 1 & 2
Channel 2
Controlled by
Switches 1 & 2
Channel 1
Controlled by
Switches 3 & 4
Channel 1
Controlled by
Switches 3 & 4
Audio Conguration (Transmitter)
Audio Conguration (Transmitter):
The Fiberlink 3620A Transmitter units have a four position DIP switch that is accessible from
the front panel. Operation is as follows:
Audio Conguration Switch Settings (Transmitter Box)
Channel Balanced Balanced Unbalanced
(Switch Position) (600 Ohms) (24k) (24k)
Switch 3 Up Switch 3 Up Switch 3 Down
Switch 4 Down Switch 4 Up Switch 4 Up
Switch 1 Up Switch 1 Up Switch 1 Down
Switch 2 Down Switch 2 Up Switch 2 Up
Audio Conguration Switch Settings (Transmitter Card)
Channel Balanced Balanced Unbalanced
(Switch Position) (600 Ohms) (24k) (24k)
Switch 3 On Switch 3 On Switch 3 O
Switch 4 O Switch 4 On Switch 4 On
Switch 1 On Switch 1 On Switch 1 O
Switch 2 O Switch 2 On Switch 2 On
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Page 9Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Channel 2
Channel 2
Channel 1
Channel 1
Audio Conguration (Receiver)
Audio Conguration Switch Settings (Receiver Box)
Channel Balanced Unbalanced Boost No Boost
(Switch Position)
Switch 4 Up Switch 4 Down Switch 2 Down Switch 2 Up
Switch 3 Up Switch 3 Down Switch 1 Down Switch 1 Up
Audio Conguration Switch Settings (Receiver Card)
Channel Balanced Unbalanced Boost No Boost
(Switch Position)
Switch 4 On Switch 4 O Switch 2 O Switch 2 On
Switch 3 On Switch 3 O Switch 1 O Switch 1 On
Audio Conguration (Receiver):
The Fiberlink 3621A Receiver units have a four position DIP switch that is accessible from
the front panel. Operation is as follows:
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Page 10 Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Audio Wiring
Audio Wiring - Transmitter
Audio Wiring - Receiver
Balanced
Balanced
Unbalanced
Unbalanced
1-
1-
1-
1-
2-
2-
2-
2-
1+
1+
1+
1+
Channel 1 Input (-)
Channel 1 Input (+)
Ground (Shield)
Channel 1 Output (-)
Channel 1 Output (+)
Ground (Shield)
Channel 1 Ground (-)
Channel 1 Signal (+)
Shield
Channel 1 Ground (-)
Channel 1 Signal (+)
Shield
2+
2+
2+
2+
G
G
G
G
Channel 2 Input (-)
Channel 2 Input (+)
Channel 2 Output (-)
Channel 2 Output (+)
Channel 2 Ground (-)
Channel 2 Signal (+)
Channel 2 Ground (-)
Channel 2 Signal (+)
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Page 11Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Indicator LEDs
LEDs
LED Status Denition
Power On Indicates that correct power has been applied.
Video O Indicates that no video is present
On Indicates that video is present
Audio O Indicates that no audio is present
Blinking Indicates that audio is present
Alarm On Loss of input video (card version only)
Indicator LEDs
The Fiberlink® 3620A Series has several indicator LEDs that are used to monitor the state of
the unit. Card versions have an additional Alarm LED.
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Page 12 Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Operating Pointers
Remember to check attenuation of the ber optic cable. The system will only operate
properly if these specications fall within the range of the system’s loss budget.
Troubleshooting
Multimode ber optic cable contains an optical ber with a light carrying “core” that is
only .0025 inches (62.5 microns) in diameter. Single mode ber optic cable has an even
smaller “core,” only .00032 to .0004 inches (8-10 microns). This is smaller than a human hair!
Therefore, any minute particles of dirt or dust can easily block the ber from accepting or
radiating light. To prevent this from happening, always use the provided dust caps when
ever optical connectors are exposed to air. It is also 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 LEDs should provide the rst clue as to the origin of any operational
failure. If these are o, it usually means that the ber is broken or has too much attenuation.
Next, be certain that the input and output signal connections are correct.
An optical power meter, such as the Fiberlink® 6615, a visible light source, such as the
Fiberlink® 6610, and a Three Wavelength Light Source, such as the Fiberlink® 6620, can
greatly assist and expedite troubleshooting of ber optic transmission systems and are
recommended tools all installers should have available.
Finally, although multimode and single mode devices may look the same, they will not
operate properly together. Using the wrong device or ber can easily add more attenuation
than specied, resulting in poor overall performance. It should be noted that some of our
ber optic products support both single mode and multimode ber in the same unit.
If, after reviewing the above possibilities, the system is still not operating, please contact
the Customer Service Department for further assistance. If you suspect your problem is
caused by the optics or the ber optic cable, and you have an optical power meter, please
take the appropriate measurements prior to contacting support.
Operating Pointers | Troubleshooting
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Page 13Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Certications
Maintenance and Repairs
The Fiberlink® 3620A Series has been manufactured using the latest semiconductor devices
and techniques that electronic technology has to oer. They have been designed for long,
reliable and trouble-free service and are not normally eld repairable.
Should diculty be encountered, Communications 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. Please see the Troubleshooting section of
this manual for additional information.
An optical power meter, such as the Fiberlink® 6615, a visible light source, such as the
Fiberlink® 6610, and a Three Wavelength Light Source, such as the Fiberlink® 6620, can
greatly assist and expedite troubleshooting of ber optic transmission systems and are
recommended tools all installers should have available.
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.
If you suspect your problem is caused by the optics or the ber optic cable, and you have
an optical power meter, please take the appropriate measurements prior to contacting
support.
Maintenance and Repairs | Certications
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Page 14 Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Communications Specialties, Inc. (CSI) warrants that, for a period of three years after
purchase by the Buyer, this product will be free from defects in material and workmanship
under normal use and service. A Return Material Authorization (RMA) number must be
obtained from CSI before any equipment is returned by the Buyer. All materials 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 damaged by fire,
war, acts of God, or similar causes, or 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
RMA numbers can also be obtained from our web site: commspecial.com
Please have your serial number available.
Warranty
Page 15
Page 15Fiberlink® 3620A Series User’s Manual
Fiberlink® 3620A Series
Accessories and Related Products
Fiberlink® 6610 Visible Light Source
The Fiberlink® Visible Light Source provides a
visible 650 nm laser output that can be used for
identifying ber breaks and individual bers within
ber bundles, allowing for convenient, on-site
testing of ber networks during construction
and maintenance procedures.
Fiberlink® 6615 Optical Power Meter
The Fiberlink® Optical Power Meter measures the
power of optical signals at 850, 980, 1310 and 1550
nm wavelengths, allowing for convenient, on-site
testing of ber networks during construction and
maintenance procedures. It can be used to measure
the power of an optical signal reaching the receiving
end of a ber optic cable, as generated either by a
transmitter unit or by a light source such as the 6620.
Fiberlink® 6620
Three Wavelength Light Source
The Fiberlink® Three Wavelength Light Source oers a
laser output at wavelengths of 1310 and 1550 nm and
VCSEL output at 850 nm, allowing for convenient,
on-site testing of ber networks during construction
and maintenance procedures.
Page 16
World Headquarters
55 Cabot Court
Hauppauge, New York 11788 USA
Tel: (631) 273-0404
Fax: (631) 273-1638
info@commspecial.com
commspecial.com
©2012 Communications Specialties, Inc.
All Rights Reserved.
Fiberlink and the starburst logo are
registered trademarks of
Communications Specialties, Inc.
CSI and the triangle designs are trademarks
of Communications Specialties, Inc.
P/N 128658 Rev. C
Fiberlink®
3620A Series
Composite Video and Two Channels of Audio
over one single mode or multimode ber.
Single Color (Black)
Communications Specialties’ Fiberlink® 3620A User’s Manual
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