Campus TV Hybrid Optical Systems

A hybrid optical system is a device or assembly that mixes two (or more) types of transmission systems. Hybrid optical systems may use optical lines for the backbone or access portions of the network and coaxial cable for the in-building distribution.

The core network is the central network portion of a communication system. The core network primarily provides interconnection and transfer between edge networks. Core networks in TV systems are commonly setup as rings and spurs. A ring is a transmission network topology whereby transmission lines provide a complete loop around an area (such as around a university campus). The ring topology is used to provide a backup distribution path to enable traffic to be quickly rerouted around the loop in the event of a cable cut. A connection spur is a communication line that extends the ring into another area for final distribution. TV systems can use a mix of fiber or coax rings in the core and fiber or coax lines to connect the viewers.

HFC systems convert (shift) the RF channels at the headend into an optical signal that can travel down a fiber (RF over glass fiber). When the optical signal reaches a node, it is converted (downshifted) back onto the radio frequency band which then travels down the coaxial line.

This figure shows a typical cable distribution system that uses a combination of fiber optic cable and coaxial cable for the local connection. This diagram shows that multiple video signals from the headend of the cable television system are converted into digital form to allow distribution through high-speed fiber cable. The fiber cable is connected in a loop around the cable television service area so that if a break in the cable should occur, the signal will automatically be available from an alternative part of the loop. The loop is connected (tapped) at regular points by a fiber node. The fiber node converts the fiber signals into RF television signals that are distributed on the local coaxial cable network. The coax network distributes the RF signals to homes in the cable television network.

   Campus Television Books

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University TV This book explains campus TV systems, how they operate, and how they are evolving. Digital video (MPEG, AVC, VC-1) and audio (MP3, AAC) technologies are explained. Copper, coax, wireless and optical distribution systems are described. You will learn about digital rights management and how universities are upgrading to IPTV. $34.99 Printed, $29.99 eBook

 

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