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Cable Modem Termination Systems (CMTS)

Cable FAQs

Cisco - Cable FAQs

Document ID: 12177

Updated: Sep 03, 2006

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Q. What is a basic sample configuration for a cable interface on a Cisco uBR7200 Series?

A. Please click here.

Q. What is a basic sample configuration for a cable interface on a Cisco uBR7100 Series?

A. Please click here.

Q. How do I configure the cable modem termination system (CMTS) to run Time of Day (ToD), Trivial File Transfer Protocol (TFTP), and Dynamic Host Configuration Protocol (DHCP) all in one?

A. For an overview of this configuration please click here.

For a more complete discussion of this configuration please see Configuring DHCP, ToD, TFTP services on Cisco's CMTS: All-In-One Configuration.

Q. Can Cisco Cable Modem Termination Systems (CMTS) be configured as a bridge?

A. Please click here.

Q. Does the Cisco CMTS support PPPoE?

A. Please click here.

Q. How do I configure Baseline Privacy in DOCSIS1.0?

A. Please click here.

Q. How do I configure bundling on a Cisco CMTS?

A. Please click here.

Q. What does the default bridging configuration look like in a Cisco Cable Modem?

A. For an overview of this configuration please click here.

For a more complete discussion of this configuration please see Configuring Cable Modem Bridging.

Q. How do I configure the Cisco Cable Modem for routing?

A. For an overview of this configuration please click here.

For a more complete discussion of this configuration please see:

Q. How do I configure the cable modem as a router doing Network Address Translation (NAT)?

A. For an overview of this configuration please click here.

For a more complete discussion of this configuration please see Configuring NAT on Cable Modem.

Q. How do I configure cable gateways to do VoIP statically without a gatekeeper?

A. Please see Configuring Cable Modem Voice Using H323v2 Static Mapping.

Q. How do I configure H.323 RAS VoIP in the Cable environment?

A. Please see Cable Modem Voice Configuration Using H323v2 Dynamic Mapping with Gatekeeper.

Q. How do I configure IPSec on a cable modem?

A. Please see IPSec Over Cable Sample Configurations and Debugs.

Q. How do I configure GRE on a cable modem?

A. Please see Configuring GRE Tunnel Over Cable.

Q. Who is in charge of the DOCSIS specification and where can I find the specifications?

A. Please see CableLabs Cable Modem DOCSIS Specifications leavingcisco.com.

Q. What is the difference between a DOCSIS Config File and an IOS Config File?

A. Please click here.

Q. What is the minimum DOCSIS protocol requirements for a cable modem to come online?

A. Please click here.

Q. Where can I get the Cisco Template DOCSIS Configuration Files bronze.cm, silver.cm, gold.cm, and platinum.cm?

A. Please click here.

Q. What is DOCSIS 1.0+?

A. Please click .

Q. Are DOCSIS 1.0 cable modems compatible with DOCSIS 1.0+ CMTS?

A. Please click here.

Q. What are the private QoS extensions?

A. Please click here.

Q. How does the DOCSIS 1.0+ architecture work?

A. Please click here.

Q. How do we ensure that an ITCM subscriber provisioned for two virtual phone lines only gets up to two high quality dynamic CBR QoS SIDs at runtime?

A. Please click here.

Q. Do I need to separately provision voice and fax lines?

A. Please click here.

Q. Is there fragmentation in DOCSIS 1.0+?

A. Please click here.

Q. How do I provision QoS on the DOCSIS 1.0+ system?

A. Please click here.

Q. Do I need a special configuration file editor to provision DOCSIS 1.0+ extensions?

A. Please click here.

Q. Are there any other network-wide configuration issues that need to be taken into account in the DOCSIS 1.0+ environment?

A. Please click here.

Q. Is there an optimal configuration on the uBR7200 for maximizing the number of VoIP calls for each upstream port?

A. Please click here.

Q. Which Cisco IOS Software release supports DOCSIS 1.0+?

A. For a brief answer, please click here.

For a more complete discussion of this issue, please see DOCSIS 1.0+ Quality-of-Service Enhancements

Q. What is the migration plan for DOCSIS 1.0+ and DOCSIS 1.1?

A. Please click here.

Q. What version of IOS supports DOCSIS 1.1 on Cisco's CMTS?

A. Please click here.

Q. Which Cisco Hardware Platforms support DOCSIS 1.1?

A. Please click here.

Q. What are the major differences between DOCSIS 1.0 and DOCSIS 1.1?

A. Please click here.

Q. What are the new software features in DOCSIS 1.1?

A. For an overview of this issue please click here.

For a more complete discussion of this configuration please see DOCSIS 1.1 for Cisco uBR7200 Series Universal Broadband Routers.

Q. Are there any new MIBs supported on DOCSIS 1.1?

A. Please click here.

Q. What Cisco IOS version supports Telco-Return?

A. Cisco IOS versions that support Telco-return are the EC, XR, and T releases including the Telco-Return feature set (t).

Q. Can I use the standard DOCSIS CPE Configurator tool to create and maintain DOCSIS configuration files that support DOCSIS 1.1 features?

A. Please click here.

Q. Will DOCSIS 1.0 compliant Cable Modems work in a DOCSIS 1.1 environment?

A. Please click here.

Q. How do I access CNR remotely?

A. Please click here.

Q. How do I access CNR remotely if the CNR server is behind a firewall?

A. Please click here.

Q. What is a policy in CNR and how do I configure it?

A. Please click here.

Q. What is a scope in CNR and how do I configure it?

A. Please click here.

Q. How do I configure Client Class Processing via CNR's GUI?

A. Please click here.

Q. How to Calculate the Hexadecimal Value for DHCP Option 2 (time offset)

A. For an overview of this issue please click here.

For a more complete discussion of this issue please see How to Calculate the Hexadecimal Value for DHCP Option 2 (time offset).

Q. How does the CMTS know the difference between PCs and modems?

A. Please click here.

Q. Why is it that cable relay-agent-option does not work in 12.0 code?

A. Please click here.

Q. How do I measure the upstream RF signal?

A. For an overview of this issue please click here.

For a more complete discussion of this issue please see Connecting the Cisco uBR7200 Series Router to the Cable Headend.

Q. How do I measure the downstream power signal from the MC-xx card?

A. Please click here.

Q. How do I measure the downstream power signal from the upconverter output?

A. Please click here.

Q. Why is it, on GI upconverters, that the frequency must be set at 1.75 MHz less than the center frequency for a particular NTSC channel?

A. Please click here.

Q. What is meant by "unity gain?"

A. Please click here.

Q. What is the correlation between the minislot size and channel widths?

A. Please click here.

Q. What do the "Show Cable Modem" States mean?

A. Please click here.

Q. What does the"*" and "!" mean for the power level reading on the "show cable modem" command?

A. Please click here.

Q. How do I decode the Cable Flap List?

A. Please click here.

Q. How many customer premises equipment (CPE) devices can be connected behind a Cisco Cable Modem in bridging mode?

A. Please click here.

Q. How many CPE devices can be connected behind a Cisco Cable Modem in routing mode?

A. Please click here.

Q. How does the interleave-depth value affect performance?

A. Please click here.

Q. What is the max number of users per CMTS?

A. Please see What is the Maximum Number of Users per CMTS?

Q. What is rate-limit token bucket?

A. Please click here.

Q. What is the difference between the several MC cards supported in Cisco uBR7200 Series?

A. Please click here.

Q. What is the Cisco uBR905 Cable Access Router?

A. Please click here.

Q. What is a typical application of the Cisco uBR905 Cable Access Router?

A. Please click here.

Q. Why is the Cisco uBR905 Cable Access Router a "cable access router" and not a "cable modem?"

A. Please click here.

Q. What are the differences between the Cisco uBR924 Cable Access Router and the Cisco uBR905 Cable Access Router?

A. Please click here.

Q. What are the primary differences between the Cisco CVA120 Series and the Cisco uBR900 Series?

A. Please click here.

Q. What software feature sets are available for the Cisco uBR905 Cable Access Router at first customer ship (FCS)?

A. Please click here.

Q. What are the DS, US, and DSNR LEDs on the front of the Cisco uBR905 cable access router and what information do they provide?

A. Please click here.

Q. Is the Cisco uBR905 Cable Access Router CableLabs-Certified?

A. Please click here.

Q. Is there a EuroDOCSIS version of the Cisco uBR905 Cable Access Router?

A. Please click here.

Q. Where can I find a more detailed FAQ for uBR905?

A. Please read Q & A Cisco uBR905 Cable Access Router for a more detailed FAQ on uBR905.

Q. What documents on CCO are available to help me understand SNMP?

A. Please see Internetworking Technology Overview - Simple Network Management Protocol (SNMP).

Q. Where can I find general troubleshooting and configuration SNMP information on CCO?

A. Please see SNMP FAQs for Cable Networks.

Q. What is an SNMP Trap?

A. For an overview of this issue click here.

For a more complete discussion of this issue please see Understanding Simple Network Management Protocol (SNMP) Traps.

Q. How do I set up Cisco CMTS (uBR7200, uBR7100 and/or uBR10000) to send a trap to a Network Management System?

A. Please click here.

Q. Which MIBs are supported in Cisco uBR7200 Series routers?

A. Please see UBR7200 Series MIB Support Lists.

For a complete list of MIBs for all Cisco products please go to Cisco MIBs.

Q. What are the specific cable MIBs, including DOCSIS?

A. Please click here.

Q. What are the Cable/DOCSIS specific MIBs support for DOCSIS 1.0, DOCSIS 1.0+, and DOCSIS 1.1 required in order to perform a basic management of a cable network and its loading sequence?

A. Please click here.

Q. How do I set SNMP community strings to manage Cable Modems?

A. Please click here.

Q. What is SNMP remote query and which Cisco IOS software version do I need on a Cisco CMTS?

A. Please click here.

Q. How do I configure SNMP remote query on a Cisco CMTS?

A. For an overview of this issue please click here.

For more detailed information about the remote-query command see Configuring cable modem remote-query Command.

Q. How do I display remote-query information from the CMTS?

A. Please click here.

Q. Why does the remote-query information display values of 0.0 when I am retrieving the information?

A. Please click here.

Q. Can I poll SNMP queries from a UNIX workstation?

A. Please click here.

Q. How can I set filtering in a cable modem?

A. Please click here.

Q. What are the most common MIB Objects/OIDs used in a cable environment and in which MIB I can find them?

A. Please click here.

Q. Where can I find an online Tool to Translate Traps and Cisco MIB Object IDs to Object Names and Vice Versa?

A. You can find the SNMP Object Navigator on the Cisco IOS MIB Tools page.

Related Information

Updated: Sep 03, 2006
Document ID: 12177