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CM1150V Upstream Channel Problem with Xfinity
I purchased a CM1150V to replace an Xfinity (Arris) XB6. The XB6 had been in place, running in bridge mode, for 2 months. It showed (4) upstream channels with good power levels, (31+OFDM) downstre...
An Xfinity tech was out today. He found a noise block filter at the pole. No idea when or why it was installed. That was blocking the two lower frequency channels.
A noise block filter had previously been ruled out, because the Xfinity-supplied Arris XB6 was reporting all (4) channels locked. So I now question the veracity of the Arris XB6 status page. All other modems tested (CM1150V, Arris TM722G, Arris SBV3202) were unable to lock the channels with that filter in place. So I don't think the Arris XB6 was actually locking those channels either, even though it said it was.
Once the tech removed the noise block filter at the pole, the CM1150V immediately locked all (4) channels. The constant T3/T4 errors are gone as well. No problems with the CM1150V, the upstream issue was all from a previous Xfinity/Comcast tech installing that noise block filter at the tap.
Thanks to vkdelta for help and supporting information, which helped me explain/prove the problem to Xfinity so they would come fix it!
thanks for good explanation.
Can you please PM me few details:
1. your Location
2. your comcast account #
3. CM1150V CM MAC
4. XB6T CM MAC
5. Can you connect both them at same time using splitter ? If you have it. (of course internet will only work on one of them and but it will be useful for comcast folks to monitor it)
5. Are you willing to work with us to debug if this is CM or Comcast issue? (Arris and NTGR are running different DOCSIS Radio chips and I have not seen this issue on other comcast plants so far)
6. Do you have another version of XB6 AKA Technicolor XB6T with you by any chance?
thanks,VKdelta
vkdelta -
I disconnected the CM1150V, connected a splitter in it's place, then connected the CM1150V and XB6 (Arris TG3482G) to the splitter. Both are connected to CMTS. The CM1150V is activated (data and voice), the XB6 is not.
Signal levels are of course degraded a bit for both, because of the additional splitter, but are still within operating range.
I will PM you with additional details as requested. Thanks for the assistance!
An Xfinity tech was out today. He found a noise block filter at the pole. No idea when or why it was installed. That was blocking the two lower frequency channels.
A noise block filter had previously been ruled out, because the Xfinity-supplied Arris XB6 was reporting all (4) channels locked. So I now question the veracity of the Arris XB6 status page. All other modems tested (CM1150V, Arris TM722G, Arris SBV3202) were unable to lock the channels with that filter in place. So I don't think the Arris XB6 was actually locking those channels either, even though it said it was.
Once the tech removed the noise block filter at the pole, the CM1150V immediately locked all (4) channels. The constant T3/T4 errors are gone as well. No problems with the CM1150V, the upstream issue was all from a previous Xfinity/Comcast tech installing that noise block filter at the tap.
Thanks to vkdelta for help and supporting information, which helped me explain/prove the problem to Xfinity so they would come fix it!