© 2006 Cisco Systems, Inc. All rights reserved.

Implementing Secure Converged Wide Area Networks (ISCW)

Module 2: Teleworker Connectivity

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Module 2: Teleworker Connectivity

Lesson 2.3: Deploying Cable System Technology

© 2006 Cisco Systems, Inc. All rights reserved.

Objectives Describe the components of a Hybrid Fiber-Coaxial

(HFC) Cable network.

Describe how data is sent over a cable network.

Identify issues encountered when using a cable network.

Describe the process for provisioning a cable modem.

© 2006 Cisco Systems, Inc. All rights reserved.

Hybrid Fiber-Coaxial (HFC) Cable Network Architecture

Using fiber provides many benefits:

Reduces the use of amplifiers

Is thin and lightweight

Covers long distances

Solves the noise problem

Immune to external interference

Easy to handle

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Sending Data over Cable

Data service runs between cable modem (CM) and cable modem termination system (CMTS).

Users on a segment share upstream and downstream bandwidth.

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Putting Cable Technology All Together

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Data Cable Technology Issues

Subscribers in a service area share the cable. This leads to:

Bandwidth shortage (can be resolved by the cable operator)

Security issues (can be resolved by the cable modem)

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Process for Provisioning a Cable Modem

© 2006 Cisco Systems, Inc. All rights reserved.

Summary Modern cable operators use an Hybrid Fiber-Coaxial

(HFC) Cable network that deploys fiber in the trunks.

Two types of equipment are required to send digital modem signals upstream and downstream on a cable system:

A cable modem (CM) on the subscriber end

A cable modem termination system (CMTS) at the headend of the cable operator

Because subscribers share a coaxial cable line, some problems may occur:

Subscribers on a segment share the available bandwidth on that segment. The bandwidth that is available to each subscriber varies based on the number of subscribers sharing it.

As with any shared media, there is a risk of privacy loss.

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Q and A

© 2006 Cisco Systems, Inc. All rights reserved.

Resources Broadband Cable

http://www.cisco.com/en/US/customer/tech/tk86/tsd_technology_support_category_home.html

CableLabshttp://www.cablelabs.com/

© 2006 Cisco Systems, Inc. All rights reserved.