American Fibertek MTX-985C, MRX-985C User Manual
03/01/13 JPK
Instruction Manual
MTX-985C
MRX-985C
Eight Channel Video Multiplexer
With Two Bi-directional Multi-Protocol
Data Channels
Table of Contents
Functional Description ........................................................................3
Installation...........................................................................................3
Power Source .....................................................................................4
Fiber Connection .................................................................................4
Video Input / Output Connections.......................................................4
Data Input / Output Connections ........................................................5
Data Mode Switches...........................................................................6
Data Termination Requirements.........................................................8
Offset Bias - RS485 Data Signals.......................................................8
MTX-985C Status LED Indicators.......................................................9
MRX-985C Status LED Indicators.....................................................10
Warranty / Service Information .........................................................12
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INSTALLATION AND OPERATION INSTRUCTIONS
INTRODUCTION
Thank you for purchasing your American Fibertek Series 985C multimode eight channel video
multiplexer with two bi-directional multi-protocol data channels. Please take a few minutes to
read these installation instructions in order to obtain the maximum performance from this
product.
FUNCTIONAL DESCRIPTION
The 985C Series units operate as a transmitter / receiver pair for the digital transmission of
eight simultaneous NTSC or PAL video signals along with two channels of field configurable bidirectional data channels over one multimode fiber optic cable. The data channel 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 2 in the RS485 4-wire configuration. For
other configurations, please refer to the DATA CONFIGURATION section for changes to
the default switch settings.
This unit is shipped with data terminations off and data bias off. For other configurations,
please refer to the DATA TERMINATION / BIAS section for changes to the default switch
settings.
The MTX-985C transmitter accepts up to eight video inputs and multiplexes these inputs into a
high speed serial data stream. This serial data stream, along with the forward data and contact
closure channels, modulates a laser at 1310nm wavelength. A Wave Division Multiplexer
combines this wavelength, along with the return data wavelength of 1550nm, onto a single
optical output port for connection to the fiber transmission system. Correspondingly, the MRX985C receiver converts the optical signal to eight independent video output signals with the
forward data and contact closure channels while transmitting the return data and contact
closure channels. Refer to the product specification sheet for additional performance data.
The individual units may be configured for rack mounting or wall mounting depending upon the
position of the included mounting hardware. Nominal dimensions of the MTX-985C and MRX985C are 1 ¾ inches high by 17 inches wide by 11 ½ inches deep. When mounting hardware is
included, overall width increases to 19 inches wide.
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.
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