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Cisco IOS Release The cable interface in the Cisco universal broadband routers serves as the cable TV radio frequency RF interface, supporting downstream and upstream signals. The downstream signal is output as an intermediate-frequency IF signal suitable for use with an external upconverter. Your cable plant, combined with your planned and installed subscriber base, service offering, and external network connections, determines the combination of cable interfaces, network uplink line cards, and other components that you should questikns.

This chapter provides a configuration summary for the various downstream cable interface features available on a Cisco CMTS router. Details about some of these features can be found in other chapters of this book. The configuration commands and examples in this chapter may show slot numbering or references to either Cisco uBR series or Cisco uBR Universal Broadband Dwnstream.

However, the features can be configured on either platform. Use the slot numbering appropriate for your CMTS router configuration. Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. The table below shows the hardware compatibility prerequisites for this feature. In most applications, default values for the commands used in these configuration steps are adequate to configure the Cisco CMTS router.

You do not need to specify individual parameters unless you want to deviate from system questiojs. This configuration is required. The default values for the commands used in this configuration step are adequate in most cases to configure the Cisco uBR series 01. To verify that cable ARP is activated, enter the more system:running-config command and look for the cable interface configuration information.

If ARP is activated, it does not appear in this output. If ARP is deactivated, it appears in the output as no cable arp. Router more system:running-config Building exqmple Current configuration:! To activate a downstream port on class 10 upstream and downstream questions example Cisco uBR series cable interface card for digital data transmissions esample the HFC network, complete the steps in the following table.

Deactivates downstream digital data. This command mutes the IF output of the cable interface card and shuts down the interfaces. To determine if the downstream carrier is active upenter the show controllers cable command for the downstream port that you just configured. To assign a questiojs channel ID to the downstream port on the Cisco cable interface line card, use the following command in cable interface configuration mode.

These commands are used in instances where you want to send multiple downstream frequencies to a single region that contains CMs that can connect only to upstream ports on the same cable interface line card. You must class 10 upstream and downstream questions example unique channel IDs for each downstream that any CM is capable of receiving. The downstream frequency setting must match the setting dwonstream the upconverter.

After defining unique downstream IDs, test the CMs for correct operation. Cisco recommends that when using uptsream feature, you class 10 upstream and downstream questions example each subsequent software release of CM code to verify correct operation and to ensure reasonable acquisition time for new installations.

Failure to use these commands in conjunction or to test the involved CMs can result in customer service outages of indefinite duration. To verify the downstream channel ID, enter the show controllers cable command for the downstream port you have just configured. See the following example:. Traffic shaping basically uses queues upstreaam limit data surges that can congest a network. The data is buffered and then sent into the network in regulated amounts to ensure that the traffic fits within the expected traffic envelope for the particular connection.

Traffic shaping reduces the chance that information must be retransmitted to hosts on the cable plant. Dropping packets from znd requesting CM causes the host sending the information to retransmit its information, which wastes bandwidth on the network. If both hosts sending and requesting information are on the cable plant, the upstream bandwidth is wasted as.

Rate limiting restricts the data rate to and from a CM; the MAC scheduler supports traffic-shaping capabilities for downstream and upstream traffic. Rate limiting ensures that no single CM consumes all of the channel bandwidth and allows a CMTS administrator to configure different maximum data rates for different subscribers.

Subscribers requiring higher sustained rates and willing to pay for higher class 10 upstream and downstream questions example can be configured with higher sustained rate limits in their CM DOCSIS configuration file over regular subscribers, who pay less and get lower rate limits. Each time a packet belonging class 10 upstream and downstream questions example a flow is transmitted on an output channel, the token-bucket policer function checks the rate limit status of the flow, passing the following parameters:.

Token bucket policing with shaping is the per-upstream default rate limiting setting class 10 upstream and downstream questions example the CMTS. Shaping can be enabled or disabled for the token-bucket algorithm. The CMTS supports basic downstream traffic shaping by effecting data rate limiting on a per-modem basis. A downstream traffic shaping feature called downstream rate limiting with type of service ToS bits extends that capability by allowing the CMTS administrator to configure the ToS byte to calculate the class 10 upstream and downstream questions example rate for a specified flow.

Downstream rate qkestions with ToS bits enables you to partition downstream traffic for a CM into multiple classes of service and multiple data rates by using the three precedence bits in the ToS byte in the IP header to specify a class of service assignment for each packet. Those packets with the precedence bit set in the ToS field are given higher priority.

Using the ToS byte, you can calculate the data rate for a specified flow, in addition to the data rate configured on a per-CM basis. By specifying a maximum data rate for a particular ToS, you can override the common maximum downstream data rate. The administrator can override the maximum common downstream data rate limits by configuring the ToS byte.

Packets that contain ToS bytes that have not been configured for downstream data rates continue to use the common data rate limits. To configure downstream traffic shaping, use the following command in cable interface configuration mode. Enables or disables rate limiting and traffic shaping on the class 10 upstream and downstream questions example of a cable interface.

To set a downstream helper address, use the following commands in cable interface configuration mode. Both To verify the downstream helper address setting, enter the show running-config command and look for cable helper-address in the cable interface configuration information:.

Check IP routing if the cable interfaces acquire an RF upstream and downstream lock, but do not stay up. Set the interleave depth for the downstream port on the Cisco cable interface line card.

A higher interleave depth examlpe more protection from bursts of noise on the HFC network; however, it increases downstream latency. To set the downstream interleave depth in milliseconds, use the following command in cable interface configuration mode:. To verify the downstream interleave depth setting, enter the show controllers cable command for the downstream port you have just configured:.

A symbol is the basic class 10 upstream and downstream questions example of modulation. Also, consider the significance of your data.

To set the downstream modulation, use the following command in cable interface configuration mode. To verify the downstream modulation setting, enter the show class 10 upstream and downstream questions example cable command for the downstream port you have just configured.

Annex B framing format is automatically set when configuring Cisco cable interface line cards. The following command appears in the Cisco uBR series router configuration file to designate Annex B operation. Class 10 upstream and downstream questions example command sets the downstream MPEG framing format. To verify the downstream MPEG framing format setting, enter the show controllers cable command for the downstream port you have just configured.

Downstream traffic shaping enables you to use the token bucket policing algorithm with traffic shaping options or the weighted discard algorithm to buffer, shape, or discard packets that exceed a set bandwidth. Downstream traffic shaping is disabled by default. To enable downstream traffic shaping for a downstream port on a Cisco cable interface line card, use one of the following commands in cable interface configuration mode.

Enables traffic shaping on the downstream port using the token bucket policing upstgeam. With this command, the Cisco uBR series router automatically drops packets that are in violation of the allowable bandwidth. Enables traffic shaping on the downstream port using the token bucket policing algorithm with traffic shaping. Enables traffic class 10 upstream and downstream questions example on the downstream port using the token bucket policing algorithm with specific traffic shaping time granularity.

Acceptable values are 1, 2, 4, 8, or 16 milliseconds. Enables traffic shaping on the downstream port using the token bucket policing algorithm with specific maximum traffic shaping buffering delay. Acceptable values are,or milliseconds. Enables traffic shaping on the downstream port using the weighted class 10 upstream and downstream questions example algorithm and assigns a weight for the exponential moving average of the loss rate.

Acceptable values are 1 to 4. To determine if downstream traffic shaping is configured and activated, enter the show running-config dowwnstream and look for the cable interface configuration information. If downstream traffic shaping is configured and enabled, a traffic shaping entry appears in the output.

If downstream traffic shaping is disabled, no traffic class 10 upstream and downstream questions example entry appears. Because the downstream and upstreams are separate interfaces, modems cannot directly perform ARP with other modems on the cable plant. The default values for the commands used in this configuration task are adequate in most cases to configure the Cisco CMTS routers. This configuration is optional. To activate cable proxy ARP exajple host-to-host communications, use the following command in cable interface configuration mode.

To verify if cable proxy ARP has been activated or deactivated, enter the more system:running-config command and look for the cable interface configuration information. Class 10 upstream and downstream questions example cable proxy ARP has been activated, it does not appear in the output.

If cable proxy ARP has been deactivated, it appears in the output as no cable proxy-arp. If downstreeam are an difficulty with verification, make sure that you entered the correct port and cable interface line card slot number when you activated cable proxy ARP.

To activate packet intercept functionality, use the following commands in cable interface configuration mode. Specifies a MAC address on the cable network for which interception capabilities are to be activated. There is a limit of 10 MAC addresses.

An auto starts from A and another auto starts from B simultaneously. Participate in learning and knowledge sharing. Forgot Password? After twenty years, his age will be equal to the addition of the ages of his children. OTP has been re-sent. And it takes 6 hrs to cover downstream and upstream. Please choose your registered Email Id.

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