American Fibertek MT-89A-L - Manual (Page 2)

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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.