GENERAL INFORMATION
The Pure Digital Fiberlink
®
7222, 7224 and 7226 transmitter units
provide 4, 8 and 12 optical outputs respectively of RGBHV video with
stereo audio. Each output transmits over one single mode or multimode
fiber at 1310 nm wavelength. The units are designed to provide point-
to-multipoint signal distribution and are compatible with all receiver
units within the 7220 Series.
The units’ all digital encoding delivers noise-free transmissions that
retain all of their initial parameters, regardless of fiber optic cable at-
tenuation. System operation may be easily monitored using integral in-
dicator LEDs on each unit that continuously signify the presence of
baseband video and audio signals.
Introduction
Technical Specifications
Model Part Number Configurations:
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
Unit Type
Part Number
Four output transmitter
7222-7S-PP*
Eight output transmitter
7224-7S-PP*
Twelve output transmitter
7226-7S-PP*
*PP Values (line cord): NA = N. America, AU = Australia,
EU = Europe, JP = Japan, UK = United Kingdom
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Therefore, any minute particles of dirt or dust can easily block the fiber
from accepting or radiating light. To prevent this from happening, al-
ways use the provided dust caps whenever optical connectors are ex-
posed 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 oper-
ating, please contact the Customer Service Department for further as-
sistance.
MAINTENANCE AND REPAIRS
The Pure Digital Fiberlink
®
7222, 7224 and 7226 transmitters 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, Communications Special-
ties 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 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
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.
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