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AE1M
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Tue, Apr 21, 2020 6:00 PM

How to enable Gb Speed

I just upgraded plan to Gb internet.  Modem is Arris 6190.  Still running at old ≤300.  Do I have to do anything to the device to get speed up?  I thought this was taken care of using DOCSIS by their side.

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6 m ago

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brintonh

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6 m ago

Same issue.  Windows 10, LAN on MB (10/100/1000).  MoCA filter and splitter where cable enters house - one leg to video distribution box, second leg directly to my modem.  Had 200 MB plan and was getting around 180 MB.  Upgraded plan to 1200 MB and modem (Arris SB8200, DOCSIS 3.1), Cat 6 directly from desktop directly to modem port just to test - would "spike" speed to around 700 MB then immediately throttle down to 320 MB - 380 MB.  Reset and reprovisioned modem twice.  No change.  Had Comcast Tech out who checked speed at pole (1200 MB), speed at tap for house (1200 MB), speed at modem (1200 MB) with "excellent power levels).  Add SB8200 in the mix and speed drops to 320-380 MB.  Tech said "Speeds based on our equipment.  SB8200 might not hold full boot file. Try our Xfi modem."  Did that - same speeds.  Would spike to around 600 MB then drop back to 320-380 MB.  Hmmm, ok.  Try another gig speed modem.  Got a Netgear CM1200 yesterday.  Set up with Cat 6 direct from desktop to modem.  Testing wee hours of the AM and get a little better but not much - certainly not 1 GB. 

  Using speedtest.net app in W10 rather than browser test - Browser test is consistently 50-100 MB slower.  Upload is fine. Modem reports:

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 627000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enabled BPI+
IP Provisioning Mode Honor MDD honorMdd(4)
 
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 32 627000000 Hz 7.8 dBmV 41.2 dB 0 0
2 Locked QAM256 1 435000000 Hz 6.3 dBmV 40.6 dB 0 0
3 Locked QAM256 2 441000000 Hz 6.1 dBmV 40.5 dB 0 0
4 Locked QAM256 3 447000000 Hz 6.3 dBmV 40.5 dB 0 0
5 Locked QAM256 4 453000000 Hz 5.9 dBmV 40.5 dB 0 0
6 Locked QAM256 5 459000000 Hz 5.8 dBmV 40.5 dB 0 0
7 Locked QAM256 6 465000000 Hz 5.4 dBmV 40.4 dB 0 0
8 Locked QAM256 7 471000000 Hz 5.5 dBmV 40.4 dB 0 0
9 Locked QAM256 8 477000000 Hz 5.5 dBmV 40.4 dB 0 0
10 Locked QAM256 9 483000000 Hz 5.8 dBmV 40.5 dB 0 0
11 Locked QAM256 10 489000000 Hz 6.1 dBmV 40.5 dB 0 0
12 Locked QAM256 11 495000000 Hz 6.4 dBmV 40.4 dB 0 0
13 Locked QAM256 12 507000000 Hz 6.7 dBmV 40.5 dB 0 0
14 Locked QAM256 13 513000000 Hz 6.8 dBmV 40.6 dB 0 0
15 Locked QAM256 14 519000000 Hz 6.3 dBmV 40.6 dB 0 0
16 Locked QAM256 15 525000000 Hz 6.6 dBmV 40.8 dB 0 0
17 Locked QAM256 16 531000000 Hz 6.1 dBmV 40.8 dB 0 0
18 Locked QAM256 18 543000000 Hz 6.1 dBmV 40.7 dB 0 0
19 Locked QAM256 19 549000000 Hz 6.1 dBmV 40.7 dB 0 0
20 Locked QAM256 20 555000000 Hz 6.7 dBmV 40.9 dB 0 0
21 Locked QAM256 21 561000000 Hz 7.1 dBmV 40.9 dB 0 0
22 Locked QAM256 22 567000000 Hz 7.4 dBmV 41.1 dB 0 0
23 Locked QAM256 23 573000000 Hz 7.4 dBmV 40.9 dB 0 0
24 Locked QAM256 24 579000000 Hz 7 dBmV 40.9 dB 0 0
25 Locked QAM256 25 585000000 Hz 6.8 dBmV 40.8 dB 0 0
26 Locked QAM256 26 591000000 Hz 6.5 dBmV 41 dB 0 0
27 Locked QAM256 27 597000000 Hz 6.1 dBmV 41.1 dB 0 0
28 Locked QAM256 28 603000000 Hz 6.9 dBmV 41.2 dB 0 0
29 Locked QAM256 29 609000000 Hz 5.8 dBmV 41 dB 0 0
30 Locked QAM256 30 615000000 Hz 7 dBmV 41 dB 0 0
31 Locked QAM256 31 621000000 Hz 6.7 dBmV 41 dB 0 0
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 1 5120 Ksym/sec 35600000 Hz 43.5 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 44 dBmV
3 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 44 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 16400000 Hz 44 dBmV
5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
 
Downstream OFDM Channels
Channel Lock
Status		 Modulation /
Profile ID		 Channel
ID		 Frequency Power SNR /
MER		 Active Subcarrier
Number Range		 Unerrored
Codewords		 Correctable
Codewords		 Uncorrectable
Codewords
1 Locked 0 ,1 ,2 ,3 33 678000000 Hz 7.7 dBmV 40.6 dB 1108 ~ 2987 107783651 105295721 0
2 Not Locked 0 0 0 Hz 0 dBmV 0.0 dB 0 ~ 4095 0 0 0
 
Upstream OFDMA Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV
 
Extended Upstream Transmit Power
Enable Extended Upstream Transmit Power
 
Current System Time:Sun Mar 28 06:41:00 2021
System Up Time:13:47:03

I'm at a loss to explain why I'm not getting the plan's reported speed.  I think I've isolated just about everything on the system except changing out LAN card in desktop but I'm thinking that's not it since I was briefly seeing 700-800MB before it dropped back down to 320-380MB.  Coax cable from tap on line to modem - check (good - no interference, no power drop, per Xfinity Tech).  Cat 6 - check (good, tried two different ones).  Modem - Check (three different modems, three different manufacturers).  Power levels in spec - check (Xfinity Tech confirmed). 

I'm at a loss to figure this out.  Hopefully someone will have an idea.  

(edited)

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EG

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@BobH2015 

Please create a new topic of your own / re-post (copy and paste your post) here on this board. Thanks. Year old dead now being closed.

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

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6 m ago

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