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Internet

Internet. To connect a subscriber to Cable Services, Internet connectivity serves as the endpoint to the subscriber. Simulation 1: Process for Provisioning a Cable Modem. Subscribers. {Click, or Press any key to continue}. CMTS. Cable Service Provider.

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Internet

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  1. Internet To connect a subscriber to Cable Services, Internet connectivity serves as the endpoint to the subscriber. Simulation 1: Process for Provisioning a Cable Modem Subscribers {Click, or Press any key to continue}

  2. CMTS Cable Service Provider Next, the Cable Service Provider defines connectivity between the Internet and the subscribers. The Cable Service Provider utilizes the Cable Modem Termination System (CMTS) to assign port connectivity to each subscriber. Simulation 1: Process for Provisioning a Cable Modem Internet Subscribers {Click, or Press any key to continue}

  3. Cable Modem The Cable Modem then connects to the CMTS to provide the subscriber with individual connectivity to the Service Provider via the CMTS. Subscription services may therefore differ among subscribers. Simulation 1: Process for Provisioning a Cable Modem CMTS (Headend) Cable Service Provider Internet Subscribers {Click, or Press any key to continue}

  4. DOCSIS Configuration File  Cable Modem Network Access: ENABLED Class of Service: Class ID: 1 Max DS Rate: 512000 bps Max US Rate: 512000 bp US Channel Priority: 7 (highest) Guaranteed min US rate: 0 (no guaranteed rate) Max US Transmit Burst: 1600 bits Baseline Privacy: DISABLED Concatenation: DISABLED Shared Secret: (is dependent upon CMTS configuration) Step 1: The cable modem must obtain a Data Over Cable Service Interface Specifications (DOCSIS) configuration file, using the CMTS Trivial File Transfer Protocol (TFTP) server. Simulation 1: Process for Provisioning a Cable Modem {Click, or Press any key to continue}

  5. DOCSIS Configuration File  Cable Modem Network Access: ENABLED Class of Service: Class ID: 1 Max DS Rate: 512000 bps Max US Rate: 512000 bp US Channel Priority: 7 (highest) Guaranteed min US rate: 0 (no guaranteed rate) Max US Transmit Burst: 1600 bits Baseline Privacy: DISABLED Concatenation: DISABLED Shared Secret: (is dependent upon CMTS configuration) In this DOCSIS configuration file, "Network Access: ENABLED" and "Class of Service" are absolutely required to enable the cable modem to send and receive Internet traffic. Simulation 1: Process for Provisioning a Cable Modem {Click, or Press any key to continue}

  6. Cable Modem CMTS Cable Service Provider Step 2: Next, the cable modem obtains its IP network address through the CMTS DHCP server. CMTS DHCP Server CMTS TFTP Server Simulation 1: Process for Provisioning a Cable Modem {Click, or Press any key to continue}

  7. Cable Modem * Applications * Processes * Memory TCP/IP Stack Headend Layer 1 Layer 2 DOCSIS MAC Address Engine CPE Network DOCSIS Network DOCSIS Physical Ethernet MAC/LLC Layer 3 Subscriber Personal Computer (PC) Simulation 1: Process for Provisioning a Cable Modem Step 3: The cable modem operates at Layer 1 (physical) and Layer 2 (media access control [MAC]/logical link control) of the Open System Interconnect (OSI) Reference Model. Therefore, Layer 3 (network) protocols (e.g. IP traffic) can be transmitted over the cable modem to the subscriber. A cable modem has at least two MAC addresses, one for the coax interface (or, HFC MAC) and one for the Ethernet interface (or, CMCI MAC for cable modem to CPE MAC). {Click, or Press any key to continue}

  8. CMTS Downstream Cable Modem Upstream Subscriber Personal Computer (PC) Simulation 1: Process for Provisioning a Cable Modem Step 4: The cable modem next obtains upstream parameters. The CMTS continuously broadcasts three separate messages on every downstream channel that relates to the MAC layer. The messages are: [1] the synchronization message (SYNC), [2] the upstream channel descriptor (UCD), and [3] the bandwidth allocation map (MAP). The cable modem must continuously identify and decode these messages in order to properly transmit data onto the cable upstream path. {Click, or Press any key to continue}

  9. CMTS Downstream Cable Modem Upstream Subscriber Personal Computer (PC) Simulation 1: Process for Provisioning a Cable Modem QoS Profiles • Step 5: The cable modem registers and ensures Quality of Service (QoS) settings with the CMTS. • Cisco routers can also use command statements to enforce various QoS profiles on the cable modem. Command statements such as: • ‘Router(config)# show cable qos profile’ and • ‘Router(config)# cable qos permission enforce index’ • assign and provision classes of service to the cable modems using QoS profiles. {Click, or Press any key to continue}

  10. CMTS Cable Modem Subscriber Personal Computer (PC) Simulation 1: Process for Provisioning a Cable Modem !-- for a non-lab environment 64 QAM is suggested cable downstream interleave-depth 32 cable downstream frequency 525000000 Step 6: The cable modem next must scan and lock on the downstream frequency. The Cisco ‘cable downstream frequency’ command statement sets the downstream frequency which is recognized by the cable modem, during the initialization process. An example configuration snippet is shown. {Click, or Press any key to continue}

  11. Cable Modem CMTS Cable Service Provider Step 7: The last step is for the cable modem to obtains its IP network address through the CMTS DHCP server. CMTS DHCP Server CMTS TFTP Server Simulation 1: Process for Provisioning a Cable Modem {Click, or Press any key to continue}

  12. Simulation 1: Process for Provisioning a Cable Modem • Therefore, the seven (7) steps to provision a cable modem to connect to a headend, as defined by the DOCSIS standard are: • Acquire DOCSIS configuration file from TFTP • Perform IP network initialization • Establish OSI Layer 1 and Layer 2 communications • Obtain upstream parameters • Register and ensure QoS settings with the CMTS • Scan and lock the downstream frequency • Acquire IP configuration parameters via DHCP {Click, or Press any key to continue}

  13. End of Simulation 1

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