Évaluations - 1, GPA: 4
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Facilité d'utilisation
6 (3-mm) screws Size—AC455A-TX-R2: 1.2"H x 4.6"W x 4.7"D (3 x 11.7 x 11.9 cm), including connectors; AC456A-RX-R2: 1.2"H x 6.3"W x 9.8"D (3.2 x 16.2 x 24.9 cm), including connectors Weight—AC455A-TX-R2: 0.7 lb. (0.3 kg); AC456A-RX-R2: 1.6 lb. (0.7 kg) 9 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) 62.5. 1 13 dB 850/1300 nm Receiver 501R 62.5. 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. 10 FIBER LINK Video and Video and response Transmitter Receiver response One coaxial One coaxial cable cable One fiber Figure 2-1. Typical Application. 11 FIBER LINK 3. Installation To install the Fiber Link, you will physically install the modules, connect the optical fiber, connect the input and output electrical signals, and connect power to the fiberoptic modules. Then you’ll verify correct system operation. 3.1 Physical Installation The Fiber Link is a standalone module. Install Fiber Links in dry locations protected from extremes of temperature and humidity. 1. Determine where you want to install the module, and make sure that there’s adequate space at both ends for making various cable connections and reading the diagnostic LEDs. 2. The Fiber Link has mounting holes for four No. 6 screws (3-mm screws). Standalone Enclosures: CAUTION Make sure that the enclosure is not connected to any power source. Look inside the enclosure to determine the location of the socket for the edge connector on the card. Orient the card so that it will seat in the socket, and slide it into the card guides in the enclosure until the edge connector at the back of the card seats in the socket. Seating may require gently pressing on the ends of the card’s front panel. 12 FIBER LINK BNC FiberVideo In, Level/Loss LEDs Command Out, Response In, Sync Out LEDs Power connection (see Figure 3-2) Figure 3-1. Standalone Transmitter. 3.2 Signal Connections All fiberoptic links convert electrical signals into a light signal at the transmitter and convert the light back to electrical signals for output at the receiver. The electrical signal connections to the Fiber Link consist of a single BNC connector on the transmitter and receiver. CAUTION Make sure all the peripheral equipment that is to be connected to the fiber unit is turned off. 13 FIBER LINK NOTE Use RG59/U coaxial cable (part number ETN59-BNC) between the video equipment and the fiber units. The video equipment and the fiber unit should be no more than 100 ft. (30.5 m) apart. Terminate the coaxial cable with a female BNC and connect it to the fiber unit. Repeat for both ends of the link. 3.3 Optical Connections The standard optical connector on the Fiber Link is ST. Connect the preterminated fiber to the two fiber units. 3.4 Power Connections All standalone modules are equipped with removable screw-terminal connectors for power input. 1. Identify the power connector and remove it from the module. 2. Make sure the power supply is not connected to any power source, and strip approximately 1.4 inch (0.6 cm) of insulation from the ends of the cable. 3. While observing correct polarization of the cable (see Table 3-1), insert one lead into one of the screw sockets and tighten the screw. Repeat for the other conductor. Confirm the security of the connection with a light pull on the cable. Table 3-1. Pin and Connector Functions Pi...
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