Podcast: Play in new window | Download | Embed

Subscribe: Spotify | Email | RSS | More

Cable Modems not Getting Speed – Top Reasons Cable Modems are not Getting Expected Speed and CMTS Monitoring

Episode 22

Hosted by Brady Volpe of the Volpe Firm, Nimble This and Guest John Downey, CMTS Technical Leader at Cisco Systems.  Today’s show we will cover cable modems not getting speed and monitoring your CMTS for proper Cable Modem State and Service Flow Operation.  At the bottom John has supplied us with his presentation if you would like to listen along with viewing the slides.  There were some technically issues on John’s end so apologies for the flickering.

Top Reasons Cable Modems are not Getting Expected Speed and CMTS Monitoring

Layer 1

  • Dropped packets (physical layer issues)
  • Not doing full bonding
  • Registered in DOCSIS 2.0 mode
  • Partial mode
  • Service flow not using proper BG
  • Testing through wireless, VPN, wireline limitations

Layer 2

  • Ethernet frame size
  • DOCSIS Overhead
  • Powerboost

Layer 3

  • V4 vs V6
  • Traffic generator
  • Layer 3 vs Layer 2 reporting
  • Single Cable Modem speed vs multiple modems/flows
  • Trying to get linerate

Layer 4

  • TCP vs UDP
  • UpStream speed limitation

For our many podcast listeners – and I know that is a majority of you – we displayed a lot of cool visuals on our show today – so you may want to consider reviewing today’s show on our website at volpefirm.com or on our youtube channel.

We do our best to bring our audience great technical content every month. You can watch us live on the air or catch our recorded episodes on YouTube. Or download our audio only version with your favorite podcatcher.

If you have enjoyed this episode, please do hit the subscribe button so that you never miss an episode.

Thank you so much for being here and we will see you next month.

Upcoming events can be seen under Broadband Events. Previous events can be seen under the blog.

  • If you are watching this on youtube please hit the subscribe button!
  • Let us know what you think and remember to share!  
  • You can find slides at the bottom of the page and some on slideshare.  
  • Find out about events or articles by following us on Twitter, LinkedIn or Facebook too.

Also available on iTunes, Google Podcasts, Spotify, vurbl see podcasts “get your tech on”.

Spotify  Vurbl