Pure Digital Fiberlink 7250 User manual

USER’S MANUAL
P/N: 124819 Rev. B
Models 7250 & 7251
RGBHV Video with Ste eo Audio
(Suppo ting WUXGA)
WORLD HEADQUARTERS
55 Cabot Cou t
Hauppauge, N.Y. 11788 USA
Tel: [phone] Fax: [phone]
www.commspecial.com
Email: [email protected]
Communications Specialties Pte Ltd
100 Beach Road
#22-09 Shaw Towe
Singapo e 189702
Tel: [phone] Fax: [phone]
Email: [email protected]

General Information ................................................... 2
Introduction ............................................................ 2
Technical Specifications ......................................... 2
Installation Instructions .............................................. 4
Installation Procedure ............................................. 4
System Connections ............................................... 5
Alarm Switch Settings ............................................ 6
Indicator LEDs ....................................................... 6
Operating Pointers and Troubleshooting .................... 8
Maintenance and Repairs ........................................... 8
Limited Warranty ........................................................ 9
CONTENTS
1
©2006, Communications Specialties, Inc.. Pure Digital Fiberlink is a registered trademark of
CommunicationsSpecialties,Inc.
8
OPERATING POINTERS AND TROUBLESHOOTING
MAINTENANCE AND REPAIRS
The Pure Digital Fiberlink® 7250 Series transmission system has been
manufactured using the latest semiconductor devices and techniques
that electronic technology has to offer. It has been designed for long,
reliable and trouble-free service and are not normally field repairable.
Should difficulty be encountered, Communications Specialties main-
tains a complete service facility to render accurate, timely and reliable
service of all products.
Optical Fiber:
The 7250 Series operates with most multimode (MM) and single mode
(SM) optical fibers. However, be aware that the type of fiber you use
will affect the system’s loss budget and the maximum transmission dis-
tance that it can support.
Troubleshooting:
Multimode fiber optic cable contains an optical fiber with a light car-
rying “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
Therefore, any minute particles of dirt or dust can easily block the fiber
from accepting or radiating light. To prevent this from happening, always
use the provided dust caps whenever 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 VIDEO and AUDIO indicator LEDs should provide
the first clue as to the origin of an operational failure. If these are 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 correct.
If, after reviewing the above possibilities, the system is still not operat-
ing, please contact the Customer Service Department for further assistance.

GENERAL INFORMATION
The Pure Digital Fiberlink® 7250 Series is a transmitter/receiver pair
that transmits a single channel of RGBHV video (up to WUXGA) and
two audio channels over two single mode or multimode fibers. It is
available as a free-standing box unit or as a card version for use in the
rackmountable 6000A card cage.
The system’s all digital encoding delivers noise-free transmissions
that retain all of their initial parameters, regardless of fiber optic cable
attenuation. System operation may be easily monitored using integral
indicator LEDs on each unit that continuously signify the presence of
baseband video and audio signals.
Int oduction
Technical Specifications
Model Part Number Configuration:
All units operate at
1310 nm wavelength
using single mode or
multimode fibers. ST
connectors are
provided.
2
Video:
Input Impedance ....................... RGB: 75 Ohms; H&V: Hi-Z
Input Level................................ RGB: 714 mV p-p; H&V: 3 to 5 V p-p
H Sync Frequency Range ......... 15 to 75 kHz
V Sync Frequency Range ......... 30 to 85 Hz
Number of Video Channels ....... 1 RGBHV
RGB Format Supported ............ RGB with separate H and V
External Signal Connectors ...... HD-15F
Unit Type Part Number
Transmitter Box 7250-B7S
Transmitter Rack Card 7250-C7S
Receiver Box 7251-B7S
Receiver Rack Card 7251-C7S
7
Module which provides an audible tone and activates a set of contacts
for external signaling purposes.
The status of the LEDs are as follows:
TR NSMITTER and RECEIVER:
Power: ON (GREEN): Indicates that correct power has been
applied.
TR NSMITTER:
Video: OFF: Indicates no video detected on the input.
BLINKING GREEN: Indicates either H or V sync detected
at the input, but not both.
STEADY GREEN: Indicates both H and V sync detected on
the input.
udio: OFF: Indicates no audio detected on the transmitter unit.
BLINKING GREEN: Audio detected on the transmitter unit.
larm: ON (RED): Loss of video (rack card only)
RECEIVER:
Video: OFF: Indicates no video detected over the fiber and, as a
result, no video present on the output.
BLINKING GREEN: Indicates either H or V sync detected
over the fiber, but not both.
STEADY GREEN: Indicates both H and V sync detected
over fiber and, as a result, video present on the output.
udio: OFF: Indicates no audio detected over fiber and, as a result,
no active audio detected by the receiver unit.
BLINKING GREEN: Audio detected over fiber and, as a
result, active audio detected by the receiver unit.
larm: ON (RED): Loss of video or optical signal (rack card only).

3
Miscellaneous:
Operating Temp. Range ........... -20oC to +60oC
Operating Power ...................... 9-24 Volts AC or DC@10 watts (max.)
Optical:
Operating Wavelength .............. 1310 nm; MM or SM
Optical Fibers ........................... 62.5/125 microns MM,
50/125 microns MM or
8-10/125 microns SM
Optical Connector .................... ST
Allowable Diff. Fiber Length .. 20 meters
lass I Laser Product complies with FDA performance standard for
laser products, Title 21, ode of Federal Regulations, Sub- hapter J.
udio:
Number of Audio Channels ..... 2, unbalanced
Frequency Response ................. +0/-0.5 dB, 20 Hz to 20 kHz
Input Impedance ....................... >24 k Ohms
Output Impedance .................... <1 Ohm
Maximum Audio Level ............. +10 dBu
THD+N ..................................... 0.005%; 20 Hz - 20 kHz
SNR (A-Weighted) ................... 95 dB
Channel Phase Differential ....... +/-0.1o
Crosstalk ................................... Min. 95 dB (1 kHz)
External Signal Connectors ...... 3.5mm Stereo jack
Audio to Video Differential
Delay (skew) .............................. <300 uS
RGB Processing ....................... 24 bits, no compression or scaling
6
larm Switch Settings (Transmitter; Card Version Only):
Switch Position larm Indication On Off
1 Loss of Video Enabled Disabled
2 N/A N/A N/A
larm Switch Settings (Receiver; Card Version Only):
Switch Position larm Indication On Off
1 Loss of Signal Enabled Disabled
2 Loss of Video Enabled Disabled
Note: “Loss of Video” refers to either loss of horizontal or vertical
sync. “Loss of Signal” refers to the absence of an optical signal.
Indicator LEDs and larm Circuitry:
The stand-alone box versions of the Pure Digital Fiberlink 7250 and
7251 units have three integral indicator LEDs that are used to monitor
the state of the units.
The rack card versions of these products have an additional red indi-
cator LED that lights when an alarm condition exists. The rack card
unit also provides an output to drive a model 6020 Alarm Sensing
Video Pin Out: Transmitter Receiver
8 Ground Ground
9 N/C N/C
10 Ground Ground
11 N/C N/C
12 N/C N/C
13 Hor. Sync. Out Hor. Sync. Out
14 Vert. Sync Out Vert. Sync Out
15 N/C N/C

Loss Budget and Maximum Transmission Distance:
Wavelength Loss Budget (in dB) Distance* (in km)
1310 MM 0-15 0.75
1310 SM 0-15 30
*Distance specifications are only approximate and are not
guaranteed. Operating loss budget must not be exceeded.
4
INSTALLATION INSTRUCTIONS
Installation Procedure:
The Pure Digital Fiberlink® 7250 Series transmission system is ready
for immediate use. There are indicator LEDs on the units for monitor-
ing purposes. The following instructions describe the typical installa-
tion procedure and the function of the LED indicators.
1. Connect the video source to the video input HD-15F connector on
the transmitter unit.
2. Connect the video output on the receiver unit to the HD-15F connector.
3. Connect the fiber optic cables between the two Pure Digital Fiberlink
units. Each fiber may be connected to either Optical 1 or Optical 2 on
the receiver, regardless of which output (1 or 2) each one is connected
to on the transmitter. The system will still operate properly if the fibers
are cross-connected. However, please note that any difference in length
between the two fibers must not exceed 20 meters.
DANGER! The transmitting element in the Pure Digital Fiberlink 7250 transmitter
unit contains 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 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.
4. Connect the audio input signals to the transmitter stereo jack and the
audio output to the receiver stereo jack.
5. Apply power to both Pure Digital Fiber-
link units. For box versions using DC
power connections, refer to Figure 1.
6. When power is applied, the green
POWER LED will light, indicating the
presence of operating power. The VIDEO LED will give an
indication as described on page 7.
7. The green AUDIO LED will give an indication as stated on page 7.
8. The system should now be operational.
Note that the rack card version has an additional red LED for
indicating the presence of an alarm condition (loss of signal). Refer
to the table on the following page for alarm enables.
System Connections:
The input and output connections for the Pure Digital Fiberlink 7250
Series system are as follows:
Audio Connector (Transmitter & Receiver): 3.5mm stereo jack
Video Connector (Transmitter & Receiver): HD-15F connector
5
Video Pin Out: Transmitter Receiver
1 Red Red
2 Green Green
3 Blue Blue
` 4 N/C N/C
5 Ground Ground
6 Ground Ground
7 Ground Ground

Loss Budget and Maximum Transmission Distance:
Wavelength Loss Budget (in dB) Distance* (in km)
1310 MM 0-15 0.75
1310 SM 0-15 30
*Distance specifications are only approximate and are not
guaranteed. Operating loss budget must not be exceeded.
4
INSTALLATION INSTRUCTIONS
Installation Procedure:
The Pure Digital Fiberlink® 7250 Series transmission system is ready
for immediate use. There are indicator LEDs on the units for monitor-
ing purposes. The following instructions describe the typical installa-
tion procedure and the function of the LED indicators.
1. Connect the video source to the video input HD-15F connector on
the transmitter unit.
2. Connect the video output on the receiver unit to the HD-15F connector.
3. Connect the fiber optic cables between the two Pure Digital Fiberlink
units. Each fiber may be connected to either Optical 1 or Optical 2 on
the receiver, regardless of which output (1 or 2) each one is connected
to on the transmitter. The system will still operate properly if the fibers
are cross-connected. However, please note that any difference in length
between the two fibers must not exceed 20 meters.
DANGER! The transmitting element in the Pure Digital Fiberlink 7250 transmitter
unit contains 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 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.
4. Connect the audio input signals to the transmitter stereo jack and the
audio output to the receiver stereo jack.
5. Apply power to both Pure Digital Fiber-
link units. For box versions using DC
power connections, refer to Figure 1.
6. When power is applied, the green
POWER LED will light, indicating the
presence of operating power. The VIDEO LED will give an
indication as described on page 7.
7. The green AUDIO LED will give an indication as stated on page 7.
8. The system should now be operational.
Note that the rack card version has an additional red LED for
indicating the presence of an alarm condition (loss of signal). Refer
to the table on the following page for alarm enables.
System Connections:
The input and output connections for the Pure Digital Fiberlink 7250
Series system are as follows:
Audio Connector (Transmitter & Receiver): 3.5mm stereo jack
Video Connector (Transmitter & Receiver): HD-15F connector
5
Video Pin Out: Transmitter Receiver
1 Red Red
2 Green Green
3 Blue Blue
` 4 N/C N/C
5 Ground Ground
6 Ground Ground
7 Ground Ground

3
Miscellaneous:
Operating Temp. Range ........... -20oC to +60oC
Operating Power ...................... 9-24 Volts AC or DC@10 watts (max.)
Optical:
Operating Wavelength .............. 1310 nm; MM or SM
Optical Fibers ........................... 62.5/125 microns MM,
50/125 microns MM or
8-10/125 microns SM
Optical Connector .................... ST
Allowable Diff. Fiber Length .. 20 meters
lass I Laser Product complies with FDA performance standard for
laser products, Title 21, ode of Federal Regulations, Sub- hapter J.
udio:
Number of Audio Channels ..... 2, unbalanced
Frequency Response ................. +0/-0.5 dB, 20 Hz to 20 kHz
Input Impedance ....................... >24 k Ohms
Output Impedance .................... <1 Ohm
Maximum Audio Level ............. +10 dBu
THD+N ..................................... 0.005%; 20 Hz - 20 kHz
SNR (A-Weighted) ................... 95 dB
Channel Phase Differential ....... +/-0.1o
Crosstalk ................................... Min. 95 dB (1 kHz)
External Signal Connectors ...... 3.5mm Stereo jack
Audio to Video Differential
Delay (skew) .............................. <300 uS
RGB Processing ....................... 24 bits, no compression or scaling
6
larm Switch Settings (Transmitter; Card Version Only):
Switch Position larm Indication On Off
1 Loss of Video Enabled Disabled
2 N/A N/A N/A
larm Switch Settings (Receiver; Card Version Only):
Switch Position larm Indication On Off
1 Loss of Signal Enabled Disabled
2 Loss of Video Enabled Disabled
Note: “Loss of Video” refers to either loss of horizontal or vertical
sync. “Loss of Signal” refers to the absence of an optical signal.
Indicator LEDs and larm Circuitry:
The stand-alone box versions of the Pure Digital Fiberlink 7250 and
7251 units have three integral indicator LEDs that are used to monitor
the state of the units.
The rack card versions of these products have an additional red indi-
cator LED that lights when an alarm condition exists. The rack card
unit also provides an output to drive a model 6020 Alarm Sensing
Video Pin Out: Transmitter Receiver
8 Ground Ground
9 N/C N/C
10 Ground Ground
11 N/C N/C
12 N/C N/C
13 Hor. Sync. Out Hor. Sync. Out
14 Vert. Sync Out Vert. Sync Out
15 N/C N/C

GENERAL INFORMATION
The Pure Digital Fiberlink® 7250 Series is a transmitter/receiver pair
that transmits a single channel of RGBHV video (up to WUXGA) and
two audio channels over two single mode or multimode fibers. It is
available as a free-standing box unit or as a card version for use in the
rackmountable 6000A card cage.
The system’s all digital encoding delivers noise-free transmissions
that retain all of their initial parameters, regardless of fiber optic cable
attenuation. System operation may be easily monitored using integral
indicator LEDs on each unit that continuously signify the presence of
baseband video and audio signals.
Int oduction
Technical Specifications
Model Part Number Configuration:
All units operate at
1310 nm wavelength
using single mode or
multimode fibers. ST
connectors are
provided.
2
Video:
Input Impedance ....................... RGB: 75 Ohms; H&V: Hi-Z
Input Level................................ RGB: 714 mV p-p; H&V: 3 to 5 V p-p
H Sync Frequency Range ......... 15 to 75 kHz
V Sync Frequency Range ......... 30 to 85 Hz
Number of Video Channels ....... 1 RGBHV
RGB Format Supported ............ RGB with separate H and V
External Signal Connectors ...... HD-15F
Unit Type Part Number
Transmitter Box 7250-B7S
Transmitter Rack Card 7250-C7S
Receiver Box 7251-B7S
Receiver Rack Card 7251-C7S
7
Module which provides an audible tone and activates a set of contacts
for external signaling purposes.
The status of the LEDs are as follows:
TR NSMITTER and RECEIVER:
Power: ON (GREEN): Indicates that correct power has been
applied.
TR NSMITTER:
Video: OFF: Indicates no video detected on the input.
BLINKING GREEN: Indicates either H or V sync detected
at the input, but not both.
STEADY GREEN: Indicates both H and V sync detected on
the input.
udio: OFF: Indicates no audio detected on the transmitter unit.
BLINKING GREEN: Audio detected on the transmitter unit.
larm: ON (RED): Loss of video (rack card only)
RECEIVER:
Video: OFF: Indicates no video detected over the fiber and, as a
result, no video present on the output.
BLINKING GREEN: Indicates either H or V sync detected
over the fiber, but not both.
STEADY GREEN: Indicates both H and V sync detected
over fiber and, as a result, video present on the output.
udio: OFF: Indicates no audio detected over fiber and, as a result,
no active audio detected by the receiver unit.
BLINKING GREEN: Audio detected over fiber and, as a
result, active audio detected by the receiver unit.
larm: ON (RED): Loss of video or optical signal (rack card only).

General Information ................................................... 2
Introduction ............................................................ 2
Technical Specifications ......................................... 2
Installation Instructions .............................................. 4
Installation Procedure ............................................. 4
System Connections ............................................... 5
Alarm Switch Settings ............................................ 6
Indicator LEDs ....................................................... 6
Operating Pointers and Troubleshooting .................... 8
Maintenance and Repairs ........................................... 8
Limited Warranty ........................................................ 9
CONTENTS
1
©2006, Communications Specialties, Inc.. Pure Digital Fiberlink is a registered trademark of
CommunicationsSpecialties,Inc.
8
OPERATING POINTERS AND TROUBLESHOOTING
MAINTENANCE AND REPAIRS
The Pure Digital Fiberlink® 7250 Series transmission system has been
manufactured using the latest semiconductor devices and techniques
that electronic technology has to offer. It has been designed for long,
reliable and trouble-free service and are not normally field repairable.
Should difficulty be encountered, Communications Specialties main-
tains a complete service facility to render accurate, timely and reliable
service of all products.
Optical Fiber:
The 7250 Series operates with most multimode (MM) and single mode
(SM) optical fibers. However, be aware that the type of fiber you use
will affect the system’s loss budget and the maximum transmission dis-
tance that it can support.
Troubleshooting:
Multimode fiber optic cable contains an optical fiber with a light car-
rying “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
Therefore, any minute particles of dirt or dust can easily block the fiber
from accepting or radiating light. To prevent this from happening, always
use the provided dust caps whenever 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 VIDEO and AUDIO indicator LEDs should provide
the first clue as to the origin of an operational failure. If these are 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 correct.
If, after reviewing the above possibilities, the system is still not operat-
ing, please contact the Customer Service Department for further assistance.

9
The only maintenance that can be provided by the user is to ascertain
that the optical connectors are free of dust or dirt that could interfere
with light transmission and that electrical connections are secure and
accurate. DANGER Always turn off the transmitter’s power before re-
moving the optical fiber from either the transmitter or receiver unit.
All other questions or comments should be directed to our Customer
Service Department. It should be noted that many “problems” can eas-
ily be solved by a simple phone call.
LIMITED WARRANTY
Communications Specialties, Inc. (CSI) warrants that for a period of three
years after purchase by the Buyer, the Pure Digital Fiberlink® 7250 Series
transmitter and receiver units 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
returned by 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 inci-
dental 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: [phone] Fax: [phone]
www.commspecial.com
Email: [email protected]
In the Asia Pacific Region:
Communications Specialties Pte Ltd
100 Beach Road, #22-09 Shaw Tower
Singapore 189702
Tel: [phone] Fax: [phone]
Email: [email protected]
Please have your serial number (located on the top label of the unit)
available with contacting us.