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CM1100 Slow Speed

colewhittet
Aspirant

CM1100 Slow Speed

Having issues with my CM1100 speeds. My plan is with Xfinity for 600 Mbps speeds, and it has historically been pretty close to that. But since I have switched to the CM1100 from Xfinity's modem, I am getting 380 Mbps from both my router and the modem directly. Xfinity support says their line is good, and speeds are good up to the modem. I have even had their support over recently to deal with a different modem, and they replaced all the line. Attached is my cable connection, also in my even log I get:

 

Started Unicast Maintenance Ranging - No Response received - T3 time-out

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received

 

1.PNG2.PNG

Model: CM1100|Nighthawk Multi-Gig Speed Cable Modem—DOCSIS 3.1
Message 1 of 10
plemans
Guru

Re: CM1100 Slow Speed

when you post photo's a moderator has to approve them. And it takes a while. 

Versus you can click on "choose file" at attach 1 file to each post. Tends to go much faster. 

Besides the logs, also include the cable connections page. 

For speedtesting, ensure you're pc/laptop is directly connected to the modem and not through a router to ensure the router isn't the issue. 

What site are you using for testing? 

Current Setup: CM2000-> RBK750-> GS716v2-> RAXE500-> Pi-hole->
Message 2 of 10
colewhittet
Aspirant

Re: CM1100 Slow Speed

It is the same speed when connecting over wifi or wired. It is also the same when connected to the modem or the router. I am using Xfinity's speedtest, but other tests say the same.

Message 3 of 10
colewhittet
Aspirant

Re: CM1100 Slow Speed

 
Message 4 of 10
plemans
Guru

Re: CM1100 Slow Speed

Your lines look pretty good. The log help as the cable connection only shows the time during when you took it. 

Something else to check into is I've had xfinity send the wrong provisioning file to my modem before. 

See if they can re-provision it. 

Current Setup: CM2000-> RBK750-> GS716v2-> RAXE500-> Pi-hole->
Message 5 of 10
colewhittet
Aspirant

Re: CM1100 Slow Speed

I'll see, here are the logs.

Message 6 of 10
colewhittet
Aspirant

Re: CM1100 Slow Speed

 
Message 7 of 10
colewhittet
Aspirant

Re: CM1100 Slow Speed

I contacted them to re-provision, nothing has changed.

Message 8 of 10
plemans
Guru

Re: CM1100 Slow Speed

what device are you testing with? 

do you have a different laptop/pc to test with? 

Current Setup: CM2000-> RBK750-> GS716v2-> RAXE500-> Pi-hole->
Message 9 of 10
colewhittet
Aspirant

Re: CM1100 Slow Speed

I am using my custom built PC to test, had no issues before even at gig speeds. The only other thing I can test from is my phone over wifi which gives me 330Mbps right next to the router.

Message 10 of 10
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