What Is Cable

• Cable refers to use of coaxial cable for signal transmission.

• CATV: originally meant "community antenna television."

• Cost-effective "broadcast" architecture cascaded to users.

• Can offer voice and data as well as analog and digital video.

© 2004 Cisco Systems, Ir

CATV, commonly called cable TV, was invented to solve the problem of poor TV reception. To ensure that consumers could obtain cable service with the same TV sets that they use to receive over-the-air broadcast TV signals, cable operators recreate a portion of the over-the-air radio frequency (RF) spectrum within a sealed coaxial cable line.

Since the introduction of high-speed data and telephony and other such services, it has become more common for the larger cable operators to have telephone switches and the cable modem termination system (CMTS). These cable operators also maintain other equipment in the same facility, taking care of both telephony and data services, in addition to analog and digital video services.

Small and medium-size businesses can gain the following benefits from high-speed cable Internet access:

Virtual Private Network (VPN) connectivity to corporate intranets SOHO capabilities for work-at-home employees Interactive television

PSTN-quality voice and fax calls over the managed IP networks

Businesses large and small have employees who work from their homes. To stay in touch, employees need secure high-speed remote access to the corporate intranet and access to the Internet for e-mail communication with customers and suppliers.

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