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Implementing Secure Converged Wide Area Networks (ISCW)

Implementing Secure Converged Wide Area Networks (ISCW). Module 2: Teleworker Connectivity. Module 2: Teleworker Connectivity. Lesson 2.2: Describing Cable Technology. Objectives. Describe the components of a typical cable system. Identify the benefits of a cable system.

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Implementing Secure Converged Wide Area Networks (ISCW)

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  1. Implementing Secure Converged Wide Area Networks (ISCW) Module 2: Teleworker Connectivity

  2. Module 2: Teleworker Connectivity Lesson 2.2: Describing Cable Technology

  3. Objectives • Describe the components of a typical cable system. • Identify the benefits of a cable system. • Explain how cable uses a part of RF electromagnetic frequencies to transmit.

  4. What is a Cable System? • CATV originally meant “community antenna television.” This form of transmission shared TV signals. • Cable systems were originally built to extend the reach of TV signals and improve over-the-air TV reception. • Modern cable systems use fiber and coaxial cable for signal transmission.

  5. Cable Technology Terms • Broadband • CATV • Coaxial cable • Tap • Amplifier • HFC • Downstream • Upstream

  6. Subscriber Drops Cable System Components

  7. Cable System Benefits • Cable is cost-effective because “broadcast” architecture is cascaded to users. • Cable supports different services: • Analog video • Digital video • Voice • Data • Inexpensive high-speed Internet access enables the application of advanced SOHO and teleworker deployments.

  8. Digital Signals over Radio Waves • Cable uses a part of RF electromagnetic frequencies. • Cable can transmit signals simultaneously in either direction. • RF portion used is subdivided for the two paths: • Downstream: Headend-to-subscriber has 810 MHz of RF bandwidth. • Upstream: Subscriber-to-headend has 37 MHz of RF bandwidth.

  9. DOCSIS • DOCSIS is a standard for certification of cable equipment vendor devices (cable modem and cable modem termination system). • DOCSIS specifies the physical and MAC layers. • DOCSIS defines RF interface requirements for a data-over-cable system. • Cable equipment vendors must pass certification conducted by CableLabs. • Euro-DOCSIS is a variation adapted for use in Europe.

  10. Summary • Modern cable systems provide two-way communication between subscribers and the cable operator. Cable operators now offer customers advanced telecommunications services including high-speed Internet access, digital cable television, and residential telephone service. • Cable systems support telephony and data services and analog and digital video services. • DOCSIS defines the communications and operation support interface requirements for a data-over-cable system and permits the addition of high-speed data transfer to an existing CATV system.

  11. Q and A

  12. Resources • DOCSIS • http://www.cablemodem.com/specifications • Broadband Cable • http://www.cisco.com/en/US/customer/tech/tk86/tsd_technology_support_category_home.html • CableLabs • http://www.cablelabs.com/

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