Consonics CyberTek Qualifier Manuale d'uso - Pagina 10

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Qualifier Supplement

Theory of Operation

CATV Distribution System

Local Tap

Private Residence

Drop Cable

Downstream Path

Upstream Path

Ground Block

Typical CATV overhead routing to private residence.

A cable television system distributes signals by a cable suspended on utility poles or by a

cable buried in the ground. A combination of both methods is not uncommon. From the

main distribution cable, a device called a local tap is used to interface the distribution system

cable to the subscriber. From one to eight and possibly more subscribers may be served from

a single local tap location. A multitude of local taps is used through out the distribution

system to provide cable services to subscribers.

From the local tap in overhead systems a drop cable is suspended from the local tap and

secured to the residence at a safe distance from the ground. The drop cable is routed down

the side of the residence to a device called a ground block. The ground block is a pass

through device connected to an earth ground. It is used to prevent static build up between the

cable system and the electrical power wiring of the residence. Thereby reducing the risk of

electrical damage to devices within the residence that are connected to cable system.

From the ground block the cable enters the residence and is routed to the device/s within the

residence. The cable within the residence may be split (branched) into a multitude of paths

supplying cable services to many locations within the residence. Examples of devices

connected to the internal cabling are television sets, VCRs, cable modems, digital carrier

receivers, and special service transceivers.