UBR10K modem sync

[dreevy]

Hello, on my ubr10K I can connect docsis 1.0 modems that show up and sync, but I cannot connect 2.0 and above, they dont even show up. I have docsis-mode tdma-atdma set, yet no go. Any ideas why?

[Georg Pauwen]

Hello,

not sure if this applies to your specific situation, but according to the documentation:

DOCSIS 2.0 A-TDMA cable modems will not register on a TDMA upstream if an A-TDMA or mixed upstream exists in the same MAC domain, unless the CMTS explicitly switches the cable modem to another upstream using an Upstream Channel Change (UCC) message. DOCSIS 1.0 and DOCSIS 1.1 cable modems cannot register on an A-TDMA-only upstream.

I assume you are running the minimum required software versions as listed here:

http://www.cisco.com/c/en/us/td/docs/cable/cmts/config_guide/b_cmts_ds_us_features/b_cmts_ds_us_features_chapter_0100.html#con_1057343

[dreevy]

Thank you for the reply, what was causing the issue was the downstream frequency, it had to be set to an odd number. Surprisingly mostly older modems were working with an even number set.