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Hi,

I have the following Arris Setup:
Modem : S33
Wifi Router : W121 Kit - Two W21 - SURFboard mAX Mesh Wi-Fi 6 system - AX6600 Speeds.

My Xfinity Plan is 1200 Mbps download and 35 Upload.

Everytime i run speedtest, i dont get more than 400 MBPS download & 30 MBPS upload.

If i reach out to Xfinity, they are promoting the Xfinity Gateway for monthly rent.

Any suggestions how to speed up using existing Arris S33 + W121 Kit Setup ?

What wired speeds do you get? 

Hardwire in a pc/laptop to the router and test what speeds you get directly using the speedtest site xfinity has. 

IF that only gets 400, then hardwire the pc/laptop directly to the modem (you’ll have to disconnect the router and reboot the modem or you won’t get a connection). Test that speeds directly. 

The goal is to figure out where the bottleneck/slow down is. Its not abnormal for wireless speeds to only hit 400mbps as there’s a ton of factors that influence wifi speed. But wired speeds should hit that 1gig speeds you pay for. 

Hi,

 

thanks for the reply. Appreciate it. 

 

I hardwired my Laptop directly to the S33 Modem 2.5GE yellow port and run about 5 tests in xfinity speed test website : 

 

Download : 279.3 MBps
6.1 Mbps upload

Download 295.2
36.7 Mbps upload

Download 325.5
37.1 Mbps upload

Download 341.3
38.3 Mbps upload

Download 344.7 Mbps
34.1 Mbps upload

 

Please let me know if you need more details 

 

Thanks 

Got a copy of the cable connections page? Usually either a line issue or provisioning issue

Hi,

This evening i called Comcast and complained on the poor speed. 

the rep told they are adjusting signals and it will be better in 2 hours, i dont believe that they could fix this remotely like they are suggesting (?) 

 

Attached is the connections status page post the Comcast signal fixing 

 

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 519000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK  
Security Enabled BPI+
DOCSIS Network Access Enabled Allowed  

 

Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
20 Locked QAM256 519000000 Hz 7 dBmV 45 dB 0 0
1 Locked QAM256 399000000 Hz 5 dBmV 44 dB 0 0
2 Locked QAM256 405000000 Hz 5 dBmV 44 dB 0 0
3 Locked QAM256 411000000 Hz 5 dBmV 43 dB 0 0
4 Locked QAM256 417000000 Hz 5 dBmV 44 dB 0 0
5 Locked QAM256 423000000 Hz 5 dBmV 44 dB 0 0
6 Locked QAM256 429000000 Hz 5 dBmV 44 dB 0 0
7 Locked QAM256 435000000 Hz 5 dBmV 44 dB 0 0
8 Locked QAM256 441000000 Hz 5 dBmV 44 dB 0 0
9 Locked QAM256 447000000 Hz 6 dBmV 44 dB 0 0
10 Locked QAM256 453000000 Hz 6 dBmV 45 dB 0 0
11 Locked QAM256 459000000 Hz 7 dBmV 45 dB 0 0
12 Locked QAM256 465000000 Hz 8 dBmV 45 dB 0 0
13 Locked QAM256 471000000 Hz 8 dBmV 46 dB 0 0
14 Locked QAM256 477000000 Hz 8 dBmV 45 dB 0 0
15 Locked QAM256 483000000 Hz 7 dBmV 45 dB 0 0
16 Locked QAM256 489000000 Hz 7 dBmV 45 dB 0 0
17 Locked QAM256 495000000 Hz 7 dBmV 44 dB 0 0
18 Locked QAM256 507000000 Hz 7 dBmV 45 dB 0 0
19 Locked QAM256 513000000 Hz 7 dBmV 45 dB 0 0
21 Locked QAM256 525000000 Hz 7 dBmV 45 dB 0 0
22 Locked QAM256 531000000 Hz 6 dBmV 45 dB 0 0
23 Locked QAM256 537000000 Hz 7 dBmV 45 dB 0 0
24 Locked QAM256 543000000 Hz 6 dBmV 45 dB 0 0
25 Locked QAM256 549000000 Hz 6 dBmV 45 dB 0 0
26 Locked QAM256 555000000 Hz 6 dBmV 45 dB 0 0
27 Locked QAM256 561000000 Hz 7 dBmV 45 dB 0 0
28 Locked QAM256 567000000 Hz 7 dBmV 45 dB 0 0
29 Locked QAM256 573000000 Hz 7 dBmV 45 dB 0 0
30 Locked QAM256 579000000 Hz 7 dBmV 45 dB 0 0
31 Locked QAM256 585000000 Hz 7 dBmV 45 dB 0 0
32 Locked QAM256 591000000 Hz 7 dBmV 45 dB 0 0
193 Locked OFDM PLC 722000000 Hz 7 dBmV 44 dB 155107126 0

 

 

Upstream Bonded Channels
Channel ID Lock Status US Channel Type Frequency Width Power
17 Locked SC-QAM 16400000 Hz 6400000 38.8 dBmV
18 Locked SC-QAM 22800000 Hz 6400000 38.5 dBmV
19 Locked SC-QAM 29200000 Hz 6400000 38.3 dBmV
20 Locked SC-QAM 35600000 Hz 6400000 38.0 dBmV
21 Locked SC-QAM 40400000 Hz 3200000 38.0 dBmV
22 Locked SC-QAM 10400000 Hz 3200000 39.0 dBmV

 

 

Current System Time:Wed Feb 5 21:49:46 2025

did it help the speeds? Those signals look pretty solid (upstream is a little low but if you’re close to a hub, might be fine)

Hi,

Yes the speeds are better now, will continue to monitor this further. 

thank you for your help in responding to my request. Appreciate it much. 

glad it improved!

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