Xfinity increaed my speed for free. Testing speed has been much slower than my plan, and I have discoved numerous potential issues.

Xfinity upgraded my plan from 300mb to 500mb out of nowhere. Great! I was using an old modem and needed to upgrade to a new one to take advantage of the speed. I installed an Arris SB6190 and set it up with xfinity. Internet works fine but upon testing speeds for multiple days with different services I am only getting 160-180mb/s. My setup goes from the cable connection >Arris modem > Netgear Nighthawk R6700. Everything is hardwired with at least cat5e. Nothing appears damaged or kinked.

So I did some investigating and ruled out connection from the router direct to PC (speed is fine). Upon looking at the modem however I encountered numerous problems, including a ton of uncorrectable errors and some troubling event logs.

I live in an apartment so I can't really inspect anything beyond the cable outlet at the wall. Wondering how to proceed. It's also worth noting some storm drain guys were doing a bunch of digging right outside my apartment at the same time I upgraded the modem (and I mean literally right up against my wall). I didn't test speeds regularly before so I don't have a before/after comparison, but its possible they could have damaged some cabling.

I should note that my internet is working fine as of now, and I probably wouldn't have noticed anything if I didn't decide to do some testing. I would however like to stop any major issues before they happen, and at least achieve speeds close to what I pay for.

Here are the logs and status from the Arris SB6190:

Sanitized log:

Time                         Priority   DescriptionTue May 28 16:05:48 2024     3          Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Tue May 28 16:06:18 2024     3          Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Tue May 28 16:07:48 2024     3          Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Tue May 28 16:08:18 2024     3          Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Tue May 28 16:09:47 2024     3          Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Tue May 28 16:10:17 2024     3          Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Tue May 28 16:11:47 2024     3          Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Tue May 28 16:12:17 2024     3          Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Tue May 28 17:54:25 2024     5          RCS Partial Service;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Wed May 29 07:54:17 2024     3          No Ranging Response received - T3 time-out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Sat Jun 01 11:07:48 2024     5          RCS Partial Service;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Sat Jun 01 11:07:48 2024     3          SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Sat Jun 01 11:07:48 2024     5          RCS Partial Service;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Sat Jun 01 11:08:26 2024     3          No Ranging Response received - T3 time-out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Sat Jun 01 11:10:53 2024     6          TLV-11 - unrecognized OID;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Sat Jun 01 21:38:35 2024     3          No Ranging Response received - T3 time-out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Sun Jun 02 12:23:57 2024     6          TLV-11 - unrecognized OID;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Sun Jun 02 12:23:57 2024     3          No Ranging Response received - T3 time-out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Sun Jun 02 14:02:05 2024     6          TLV-11 - unrecognized OID;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;Sun Jun 02 14:02:12 2024     3          No Ranging Response received - T3 time-out;CM-MAC=[CM MAC address removed];CMTS-MAC=[CMTS MAC address removed];CM-QOS=1.1;CM-VER=3.0;

 

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