I'm having problems making the Arris CM550B work on a plant with DOCSIS-only downstreams.
The downstreams have assigned standard frequencies from the NTSC channel plan, and other CMs (e.g. Scientific Atlanta, e.g. EPC2203) find the channels without any probs and do come online.
We have an isolated router with a test network of just 5 meters of coax and 3 cable modems, so it's not plant issues, etc. It's not modulations too - tried QAM64 also.
Looking at the Arris diagnostic page, it does seem to scan very weird frequencies when dooing the inital fast scan (ones not in the NTSC nor PAL channel plan). When doing the thorough scan, it goes through the downstreams, shows some not-bad SNR (25+) but does not even attempt to connect.
We have succesfully used other EuroDOCSIS CMs on DOCSIS-only plants, but only Scientific Atlantas and Motorolas - all without any issues manage to find & lock DOCSIS downstreams. There was just one particular Scientific Atlanta model which required an SNMP OID set so it is allowed to join DOCSIS downstreams.
I do have newer firmware for the Arris modems, but as they don't even try to connect, there's no way to push it through the cable plant.
Is there a way to make the Arris CM550B work on DOCSIS-only plant?
Is there a way to update the firmware through the Ethernet port?
Is there some hidden advanced-settings page (like the Motos have), which might allow me to change channel plan / preferred DS frequency(-ies)?
Any help much appreciated.
P.S. Is that why people buy Cisco?
Arris simply makes no hybrid device - motorola, thomson, and cisco do :) I dont think you would run any Arris B series on DOCSIS plant at all, sorry
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