1. © 2006 Cisco Systems, Inc. All rights reserved. Implementing Secure Converged Wide Area Networks (ISCW) Module 2: Teleworker Connectivity

2. © 2006 Cisco Systems, Inc. All rights reserved. Module 2: Teleworker Connectivity Lesson 2.3: Deploying Cable System Technology

3. © 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.

4. © 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

5. © 2006 Cisco Systems, Inc. All rights reserved. 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.

6. © 2006 Cisco Systems, Inc. All rights reserved. Putting Cable Technology All Together

7. © 2006 Cisco Systems, Inc. All rights reserved. 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)

8. © 2006 Cisco Systems, Inc. All rights reserved. Process for Provisioning a Cable Modem

9. © 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.

10. © 2006 Cisco Systems, Inc. All rights reserved. Q and A

11. © 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 CableLabs http://www.cablelabs.com/

12. © 2006 Cisco Systems, Inc. All rights reserved.