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INSTALLATION AND OPERATION INSTRUCTIONS
INTRODUCTION
Thank you for purchasing your American Fibertek Series 945SL singlemode four channel video
multiplexer with bi-directional multi-protocol data. Please take a few minutes to read these installation
instructions in order to obtain the maximum performance from this product.
FUNCTIONAL DESCRIPTION
The MT-945SL operates as half of a transmitter / receiver pair for the digital transmission of four
simultaneous NTSC or PAL video signals along with two channels of field configurable bi-directional
data over one singlemode fiber optic cable. These data channels may be configured as RS485 data,
RS422 data, RS232 data, or Manchester data. The RS485 channel may be configured for 2-wire (half
duplex) or 4-wire (full duplex) with or without biasing. Switch selectable internal 120 ohm terminations
are available for RS422 or RS485 data.
NOTE: This unit is shipped with Data Channel 1 and Data Channel 2 in the RS485 4-wire
configuration. For other configurations, please refer to the DATA CONFIGURATION section for
changes to the default switch settings.
NOTE: This unit is shipped with data terminations off and data bias off for Data Channel 1 and
Data Channel 2. For other configurations, please refer to the DATA TERMINATION / BIAS section
for changes to the default switch settings.
The MT-945SL multiplexes four video input signals along with two data signals into a high speed serial
data stream. This serial data stream modulates a laser at 1310nm wavelength. The MT-945SL also
detects and demultiplexes a return optical serial data stream containing two data signals at 1550nm
wavelength. The 945SL Series product is designed to operate over an optical loss budget range of 0dB
to 21dB on 9um singlemode fiber. Refer to the data sheets for detailed performance specifications.
This unit is contained in a rugged aluminum housing with internal dc voltage regulation. The detachable
terminal blocks and LED indicators provide for easy installation and monitoring of video, data, and
optical power.
The MT-945SL is designed for mounting as a modular stand alone unit. For a rack mounted version
please see the RT-945SL.
INSTALLATION
THIS INSTALLATION SHOULD BE MADE BY A QUALIFIED SERVICE PERSON AND SHOULD
CONFORM TO THE NATIONAL ELECTRICAL CODE, ANSI/NFPA 70 AND LOCAL CODES.
Mount the unit to a secure surface using #8 (3mm) hardware in four places. See the drawing on the
next page for mounting dimensions. Be sure to allow sufficient room for the required minimum bend
radius of the fiber cable used.
POWER SOURCE
THIS PRODUCT SHALL BE POWERED BY A LISTED CLASS 2 POWER SUPPLY ONLY.
This unit requires a +12VDC power source with a current rating of 1.25 amps for proper operation. The
DC input is diode protected. In the USA and in Canada an American Fibertek PS-12D is supplied with
this unit. The negative side of the power input is directly connected to ground. ANSI/NFPA 70 Class 2
wiring is recommended.
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