Black Box AC456A-RX-R2, AC455A-TX-R2 manual Introduction, Description, Additional Features

FIBER LINK

2. Introduction

2.1 Description

The Fiber Link supports the transmission of video from a camera to a monitoring station and a data signal back to the camera over one multimode fiber. A single coaxial cable at each end of the link is used to connect the appropriate equipment to the system. In up-the-coax systems, video signals travel in one direction and control signals travel in the other direction for full-duplex operation. Video is transmitted from the camera back to the control center over coaxial cable. In conventional coax systems, signals travel in only one direction at a time. Control signals to operate the pan-tilt-zoom (PTZ) functions are transmitted from the control station out to the receiver/driver at the camera station. The Fiber Link is a single-fiber link that uses two different wavelengths (850 and 1300 nm) for two-way transmission.

The control signals are transmitted during the vertical blanking period of the video signal. In addition to video and control, the Fiber Link provides for the transmission of response signals from the camera station to the control station. It also provides for transmission of embedded genlock sync if genlocking is a feature of the particular control system used. It works with all major brands of up-the-coax systems.

The Fiber Link features extensive LED diagnostics, with input/output indicators for video, command, response, genlock sync, and optical signal strength.

Table 2-1. Available Models

Model	Enclosure	Fiber	Number	Maximum	Wavelength
	Type	Size	of Fibers	Attenuation
Transmitter	4 x 4 (10 x 10 cm)	62.5µ	1	13 dB	850/1300 nm
Receiver	501R	62.5µ	1	13 dB	850/1300 nm

2.2 Additional Features

•Operating distances of 10,000 feet (3048 m) make possible expanded, simpler systems.

•Built-in automatic gain control compensates for optical loss within a system.

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