American Fibertek RT-915C User Manual

© Copyright 2012, American Fibertek, Inc. 3-11-13 JPK

Bi-directional Multi-Protocol Data

And Bi-directional Contact Closure

Instruction Manual

Video Transmitter With

RT-915C

INSTALLATION AND OPERATION INSTRUCTIONS

INTRODUCTION

Thank you for purchasing your American Fibertek RT-915C multimode video transmitter with bi­directional multi-protocol data and bi-directional contact closure. Please take a few minutes to read
these installation instructions in order to obtain the maximum performance from this product.

FUNCTIONAL DESCRIPTION

The RT-915C operates as half of a transmitter / receiver pair for the transmission of high performance
10 bit digital NTSC, PAL, RS170, or RS343 video signals. The RT-915C also supports two bi­directional data channels. These data channels are configured as follows:
Channel 1: RS485 (2 or 4 wire) data, RS422 data, RS232 data, or Manchester data

Channel 2: Contact Closure (dry)

NOTE: This unit is shipped with Channel 1 in the RS485 4-wire configuration. For other
configurations, please refer to the DATA CONFIGURATION section for changes to the default
switch settings.

The RT-915C is designed to operate with the MR-915C or RR-915C video receiver with bi-directional
data over one multimode fiber optic cable.

The RT-915C multiplexes a single video input signal along with up to two data signals into a high speed
serial data stream. This serial data stream modulates a laser at 1310 nm wavelength. The RT-915C
also detects and demultiplexes a return optical serial data stream signal containing up to two data
channels at 1550 nm wavelength. The 915 Series product is designed to operate over an optical loss
budget range of 0 to 12 dB when used on 62.5 um multimode fiber. The RT-915C will also operate on
50 um multimode fiber at a reduced loss budget range. Refer to the product specification sheet for
additional performance 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.

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 RT-915C is designed for mounting as a modular stand alone unit. For a rack mounted version
please see the RT-915C.

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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.

The unit slides into any open slot in the SR-20 or SR-20D subrack. Use a small screwdriver to push
and lock the two ¼ turn fasteners into place.

POWER SOURCE

Power to the unit is supplied by the subrack. Please refer to the SR-20/SR20D and PSR-2 instructions
for further details.

POWER CONNECTION

Power is supplied to the unit via a four finger backplane connector. The RT-915C can be inserted into
the subrack or removed from the subrack with power applied to the backplane.

FIBER CONNECTION

The fiber optic connection is made via a ST connector located on the back of the unit. Be sure to allow
sufficient room for the required minimum bend radius of the fiber cable used.

VIDEO INPUT CONNECTION

The video input connection is made via a BNC connector on the back of the unit. The video input
should be connected to an appropriate 75 base band video source such as a camera or a video
recorder output. For optimum performance the video cables should be the shortest length of coax
practical.

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