American Fibertek MT-915D User Manual

Bi-directional Multi-Protocol Data,

Bi-directional Contact Closure,

And Remote Diagnostic Interface

Instruction Manual

Video Transmitter With

MT-915D

INSTALLATION AND OPERATION INSTRUCTIONS

INTRODUCTION

Thank you for purchasing your American Fibertek MT-915D multimode video transmitter with bidirectional data, contact closure, and remote diagnostic interface. Please take a few minutes to read these installation instructions in order to obtain the maximum performance from this product.

FUNCTIONAL DESCRIPTION

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

The MT-915D 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 MT915D also detects and demultiplexes a return optical serial data stream signal containing up to two data channels at 1550 nm wavelength. The 915D 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 MT-915D 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 MT-915D is designed for mounting as a modular stand alone unit. For a rack mounted version please see the RT-915D.

The MT-915D has a built in capability to be remotely monitored through the Afinety Remote Diagnostics System. A SR-20D/2 subrack and a RD-20D diagnostic card are required to facilitate this feature. Please refer to the SR-20D/2 and RD-20D Instruction Manuals for proper operation of this feature.

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.

POWER CONNECTION

Power is supplied to the unit via a two pin terminal connector on the right side of the unit. Follow the label on unit for proper orientation of +12 volt dc and ground.

FIBER CONNECTION

The fiber optic connection is made via a ST connector located on the right side of the unit.

VIDEO INPUT CONNECTION

The video input connection is made via a BNC connector on the right side of the unit. The video input should be connected to an appropriate 75Ω baseband 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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