American Fibertek MT-89A-L User Manual

Aiphone LEF Series Intercom

Instruction Manual

MT-89A-L

Audio Transceiver For

INSTALLATION AND OPERATION INSTRUCTIONS

INTRODUCTION

Thank you for purchasing your American Fibertek MT-89A-L multimode audio / contact closure transceiver. Please take a few minutes to read these installation instructions in order to obtain the maximum performance from this product.

FUNCTIONAL DESCRIPTION

The MT-89A-L operates as half of a transceiver pair for the transmission of bi-directional Aiphone LEF Series intercom signals. It is designed to operate with the MR-89A-L or RR-89A-L audio transceiver over a single multimode fiber optic cable. In addition, the MT-89A-L can receive one independent dry contact closure from the MR-89A-L or RR-89A-L.

The MT-89A-L converts an audio input signal along with a call button input into an optical output using a 1310nm wavelength source. The MT-89A-L also converts an optical input signal returning on the same fiber into an audio output and a contact closure output using an 850nm wavelength detector. The 89A-L Series product is designed to operate over an optical loss budget range of 0dB to 12dB. The MT-89A-L operates on 50um or 62.5um multimode fiber. Refer to the data sheets for detailed performance specifications.

This unit is contained in a compact and rugged aluminum housing with internal dc voltage regulation. The detachable terminal blocks and LED indicator provide for easy installation and monitoring of optical and ac power.

The MT-89A-L is designed for mounting as a modular stand alone unit. For a rack mounted version please see the RT-89A-L.

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 an isolated 24VAC center tap power source for proper operation. In the USA and in Canada an American Fibertek PS-24CT-T is supplied with this unit. ANSI/NFPA 70 Class 2 wiring is recommended.

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