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Cable Modem Termination Systems (CMTS): Architecture, Configuration, and Troubleshooting - FAQ from Live Webcast

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With Eric Bautista

 

These are the slides for the live webcast. During the live event you will receive an overview of the Cisco Cable Modem Termination System (CMTS) platforms and the uBR product family. Eric Bautista will review the various hardware components and the role of a CMTS in a cable multiple system operator (MSO) network. Bautista will also provide some basic configuration and troubleshooting examples. Given this information, the learner will be able to identify what platform and modules are being used. They will also be able to describe the hybrid fiber coax (HFC) topology and the current state of the cable interfaces.

 

Eric Bautista is a Customer Support Engineer at the Cisco Technical Assistance Center (TAC). He is responsible for supporting the Cisco uBR CMTS platforms. He has 3.5 years of experience in cable technology. Previous to his current role, Bautista supported Cisco WAN and optical technologies, including QoS and SONET/SDH.

 

 

Webcast related links:

 

 

 

General Questions:

Q. Can you please comment on IPv6 HW Acceleration Support on Cisco 7225 and Cisco 7246?

A. This question is answered in the Ask the Expert Event.

 

 

Q. Are MC16U and MC28U going to be end of support (EoS)?

A. Yes. Both are end of sale, but not end of support. MC28U will be available, but not MC16U.
Eric informed that he needs to verify the info.

 

Q. At what customer level does a person say, "Hey, time to upgrade to that 10k now", when looking at the network?

A. There are lots of variables: it can be modems; if the overall count of modems is growing that are not able to be supported on the 7246;
or if your bandwidth requirement is higher than you need to upgrade. Basically, it is utilization and it is due more to capacity than the features.

 

Q. Does the rf-shutdown command replace the shutdown command? For example, do I need the no shutdown command on int cable?

A. There is no "no shutdown" command under "int cable”. If there is no "no shutdown" command, then definitely use the "no cable rf-shutdown" command to turn on the physical RF on wire.

 

 

Q. I noticed that +1 line card redundancy was mentioned without mentioning a RF switch. Is it possible to set up line card redundancy without a RF switch?

A. The RF switch is definitely needed in the upstream direction. However, in downstream direction if you are doing modular CMTS, then you do not need a RF switch in that direction. In this case redundancy will be provided via gigabit ports. You need a RF switch to switch feasible connection and to protect line card.

 

Q. Where is the typical location for configuration files of both CM and MTAs?

A. The configuration files CM and EMTAS are typically located in CNR.

 

Q. What is difference between DCE and DTE?

A. DCE is data communication equipment and DTE is data terminating equipment.

 

Q. Can I put DC and AC in the same chassis working together?

A. This question is answered in the Ask the Expert Event.

 

Q. With NPE1 or 2, is the I-O controller card necessary anymore? Or, is there any configuration where this card needs to be considered?

A. This question is answered in the Ask the Expert Event.

 

Q. Do you have to configure the frequency on the CMTS or the up-converter?

A. This question is answered in the Ask the Expert Event.

 

Q. What solutions are available for monitoring SNR on the CMTS as well as Customer eMTAS?

A. This question is answered in the Ask the Expert Event.

 

Q. When stacked ports are on the MC20x20 line card, is it to fulfill more bandwidth? Or, does it work a two-way interface or interface as a bridged port?

A. This question is answered in the Ask the Expert Event.

 

Q. Is it best to use cable map-advance dynamic or static?

A. This question is answered in the Ask the Expert Event.

 

uBR Related Questions:

 

Q. Is there any specific IOS for CMTS uBRs? Or, can you use the same as Cisco Routers/Switches?

A. This question is answered in the Ask the Expert Event.

 

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

A. For an optimal configuration on the uBR7200 for maximizing the number of VoIP calls for each upstream port, refer to Cable DOCSIS 1.0 FAQ.

 

Q. Can you explain more in detail how to achieve RF line card redundancy on a uBR10k?

A. For more information on how to achieve RF line card redundancy on a uBR10k, refer to N+1 Redundancy for the Cisco CMTS Routers.

 

Q. How many bundles can you configure on a uBR 200? Is there a limitation?

A. This question is answered in the Ask the Expert Event.

 

DOCSIS Related Questions:

 

Q. What are the main benefits of DOCSIS 2 vs. DOCSIS 3.0?

A. DOCSIS 3.0 introduces the upstream and downstream channel bonding. It supports IPv6, but DOCSIS 2.0 does not support IPv6.
DOCSIS 3.0 has enhanced security and also multicast support.

 

Q. How about D3.0 with IPv6?

A. This question is answered in the Ask the Expert Event.

 

SPA Related Questions:

 

Q. What is the role of SPA-5x1GE-v2 for 3G60 line cards?

A. The SPA-5x1GE-v2 and G360 line cards are not related to each other. 3G60 line cards are used to bring the cable modem up, and they can operate on their own without the SPA-5x1GE-v2. The SPA-5x1GE-v2 is just used for gigabit traffic more towards the IP backbone of the provider. The wide band SPA can perform similar functionality as the 3G60. Previously, these did not work together. However, in the new software version they can work together. An example is Wide Band Configuration.

 

Q. What are the SPA (shared port adapter) and SIP modules? Where do they fit on the CMTS (line card or the NPE, or separate slots)? In terms of benefits, why would a person use them?­

A. The SIP module is a carrier card into the switch you can insert SPA. These are located on the bottom right of the CMTS.

Also, see slide 23 from the ppt for further explanation. Additional information available in the Ask the Expert Event.

 

Q. Is the wide band SPA only for 5x20 and 20x20 cards w/RFGW1 or 10?

A. This question is answered in the Ask the Expert Event.

 

 

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