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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!
I can't tell if my problem is the same or not. Just activiated my cm1150v. The problem I am having is that I have an ethernet cable run right from the modem to my computer (from port 2), and then an ethernet cable running to my router out of port 1 as instructed in the manual. However, when I have them both plugged in at same time, only 1 works at a time; meaning only 1 can access the internet it seems. So, If unplug my laptop, the router will start connecting to the internet. If I unplug the router, the comptuer will start working. Obvioulsy I have rebooted everything numerous times. My previous Arris never had a problem once
schillit wrote:
I can't tell if my problem is the same or not. Just activiated my cm1150v. The problem I am having is that I have an ethernet cable run right from the modem to my computer (from port 2), and then an ethernet cable running to my router out of port 1 as instructed in the manual. However, when I have them both plugged in at same time, only 1 works at a time; meaning only 1 can access the internet it seems. So, If unplug my laptop, the router will start connecting to the internet. If I unplug the router, the comptuer will start working. Obvioulsy I have rebooted everything numerous times. My previous Arris never had a problem once
That's a different issue... Xfinity residential service only supports one device (one MAC address) and a single IP at a time. For activation and testing, connect a computer directly to port 1 of the CM1150V. For normal operation, connect your router to port 1 of the modem. The other 3 ports on the CM1150V are not for additional devices, but rather for using its port aggregation (with proper ISP support and a compatible router).
Thank you for the help, makes sense now. i guess that's why there were black tabs in port 2,3,4 :)