RGBHV Video with

Stereo Audio

USER’S MANUAL

Models 7220 and 7221

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: 122995 Rev. D



CONTENTS

General Information ................................................... 3

Introduction ............................................................ 3

Technical Specifications ......................................... 3

Installation Instructions .............................................. 5

Installation Procedure ............................................. 6

System Connections ............................................... 6

Alarm Switch Settings ............................................ 7

Indicator LEDs and Alarm Circuitry ...................... 7

Operating Pointers and Troubleshooting ................... 9

Maintenance and Repairs ......................................... 10

Limited Warranty ..................................................... 11

1



GENERAL INFORMATION

Introduction

The Pure Digital Fiberlink

®

7220 Series is a transmitter/receiver pair

that transmits a single channel of RGBHV video and two audio chan-

nels over one single mode or multimode fiber. 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.

Technical Specifications

Model Part Number Configurations:

Unit Type

Part Number

Transmitter Box

7220-B7S

Transmitter Rack Card

7220-C7S

Receiver Box

7221-B7S

Receiver Rack Card

7221-C7S

All units transmit at

1310 nm wavelength

over single mode or

multimode fiber. ST

connectors are

provided.

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 ......... 31.5 to 60 kHz

V Sync Frequency Range ......... 30 to 85 Hz

Number of Video Channels ...... 1 RGBHV

RGB Format Supported ............ RGB with separate H and V

3



Signal Connectors ................................ HD-15F

RGB Processing ................................... 24 bits, no compression or

scaling

Audio:

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 ................... +/-0.1

o

Crosstalk ............................................... Min. 95 dB (1 kHz)

Signal Connectors ................................ 3.5mm Stereo jack

Audio to Video Diff. Delay (skew) ..... <300 uS

Optical:

Operating Wavelength ......................... 1310 nm; MM or SM

Optical Fiber ........................................ 62.5/125 microns MM,

50/125 microns MM or

8-10/125 microns SM

Optical Connector ................................ ST

Class I Laser Product complies with FDA performance standard for

laser products, Title 21, Code of Federal Regulations, Sub-Chapter J

Miscellaneous:

Operating Temp. Range ........... -20 to +60 degrees C

Operating Power ...................... 9-24 Volts AC or DC@5 watts (max.)

4



Loss Budget and Maximum Transmission Distance:

Wavelength

Loss Budget (in dB) Distance* (in km)

1310 MM

0-15

0-0.75

1310 SM

0-15

0-35

*Distance specifications are only approximate and are not

guaranteed. Operating loss budget must not be exceeded.

DANGER! The transmitting element in the Pure Digital Fiberlink 7220 transmit-

ter 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.

INSTALLATION INSTRUCTIONS

Installation Procedure:

The Pure Digital Fiberlink

®

7220 Series transmission systems are

ready for immediate use. There are indicator LEDs on the units for moni-

toring purposes. The following instructions describe the typical instal-

lation 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 cable between the two Pure Digital Fiberlink

units.

4. Connect the audio input signals to the transmitter stereo jack and the

audio output to the receiver stereo jack.

5



5. Apply power to both Pure Digital

Fiberlink

®

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 indica-

tion as described on Page 8.

7. The green AUDIO LED will give an indication as stated on

Page 8.

8. The system should now be operational.

Note that the rack card version has an additional red LED for indicat-

ing 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

®

7220 Series system are as follows:

Audio Connector (Transmitter & Receiver):

Video Connector (Transmitter & Receiver):

Video Pin Out:

1

2

3

4

5

6

7

Transmitter

Red

Green

Blue

N/C

Ground

Ground

Ground

6

3.5mm stereo jack

HD-15F connector

Receiver

Red

Green

Blue

N/C

Ground

Ground

Ground



System Connections - “Video Pin Out” continued:

Video Pin Outs:

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. In

Hor. Sync Out

14

Vert. Sync In

Vert. Sync Out

15

N/C

N/C

Alarm Switch Settings (Transmitter; Card Version Only):

Switch Position

1

2

Alarm Indication

Loss of Video

N/A

On

Enabled

N/A

Off

Disabled

N/A

Alarm Switch Settings (Receiver; Card Version Only):

Switch Position

1

2

Alarm Indication

Loss of Signal

Loss of Video

On

Enabled

Enabled

Off

Disabled

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 Alarm Circuitry:

The stand-alone box version of the Pure Digital Fiberlink

®

7220

Series transmission unit has three integral indicator LEDs that are used

to monitor the state of the unit.

The rack card version of this product has an additional red indicator

LED that lights when an alarm condition exists. The rack card unit also

7



provides an output to drive a model 6020 Alarm Sensing Module which

provides an audible tone and activates a set of contacts for external

signaling purposes.

The status of the LEDs are as follows:

TRANSMITTER and RECEIVER:

Power:

ON: (GREEN) Indicates that correct power has been applied.

TRANSMITTER:

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.

OFF: Indicates no audio detected on the transmitter unit.

BLINKING: Indicates audio detected on the transmitter unit.

Audio:

Alarm:

ON: Loss of video (rack card only)

RECEIVER:

Video:

OFF: Indicates no video detected over 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.

8



RECEIVER (continued):

Audio:

OFF: Indicates no audio detected over fiber and, as a result,

no active audio detected by the receiver unit.

BLINKING: Indicates audio detected over fiber and, as a

result, active audio detected by the receiver unit.

Alarm:

ON: Loss of video or optical signal (rack card only).

OPERATING POINTERS AND TROUBLESHOOTING

Optical Fiber:

The 7220 Series is available in versions that operate with most mul-

timode (MM) and single mode (SM) optical fibers. Be certain that the

correct size fiber is being used for the particular transmitter/receiver

combination.

Also, remember to check the attenuation and bandwidth of the fiber

optic cable. The system will only operate properly if these specifica-

tions fall within the range of the system’s loss budget.

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! There-

fore, 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.

9



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.

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 oper-

ating, please contact the Customer Service Department for further as-

sistance.

MAINTENANCE AND REPAIRS

The Pure Digital Fiberlink

®

7220 Series transmission units have been

manufactured 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 repair-

able. Should difficulty be encountered, Communications Specialties

maintains a complete service facility to render accurate, timely and re-

liable service of all products.

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 disconnect the transmitter power before

removing the optical fiber from the 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.

10



LIMITED WARRANTY

Communications Specialties, Inc. (CSI) warrants that for a period of

three years after purchase by the Buyer, the Pure Digital Fiberlink

®

7220 Series transmission System will be free from defects in material

and workmanship under normal use and service. A Return Material Au-

thorization (RMA) number must be obtained from CSI before any equip-

ment is returned by the Buyer. CSI’s obligation under this warranty

will be limited, at its option, to either the repair or replacement of de-

fective 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 equip-

ment 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

www.commspecial.com Email: info@commspecial.com

Or, in the Asia Pacific Region:

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

Please have your serial number (located on the top label of the unit)

available with contacting us.

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