Community Forum

Upgraded to XB7 & Gigabit Internet but Maxing Out @ 30mbps

AndrewCVille
Regular Visitor

Upgraded to XB7 & Gigabit Internet but Maxing Out @ 30mbps

Hey everyone,

 

We upgraded to gigabit internet to support working from home and other needs and ever since, we're getting a very steady ~30mbps download and ~40mbps upload.

 

I've gone through multiple "Tier 2" reps and tried all troubleshooting steps culminating with changing my XB6 gateway over to an XB7 this evening. The latest rep noticed "signal impairment" with some indexes showing "not locked" and 0.0 dB.

 

Need some help from any Comcast employees on the forum with a higher level of knowledge on network issues. I've scoured the forums and Reddit for tips and tried any and all options I could find. 

 

Thank you for your help!

 

IndexLock StatusFrequencySNRPower LevelModulation

Downstream
Channel Bonding Value
37
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
38
39
40
159
 
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Not locked
Not locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
651 MHz
483 MHz
489 MHz
495 MHz
501 MHz
507 MHz
513 MHz
519 MHz
525 MHz
531 MHz
537 MHz
543 MHz
549 MHz
555 MHz
561 MHz
567 MHz
573 MHz
579 MHz
585 MHz
591 MHz
597 MHz
603 MHz
609 MHz
615 MHz
621 MHz
627 MHz
633 MHz
639 MHz
645 MHz
657 MHz
663 MHz
669 MHz
690 MHz
611600000
40.3 dB
41.7 dB
41.4 dB
41.7 dB
41.7 dB
41.4 dB
41.4 dB
41.3 dB
31.0 dB
39.7 dB
33.2 dB
35.6 dB
38.9 dB
0.0 dB
0.0 dB
34.3 dB
31.8 dB
36.9 dB
28.2 dB
37.9 dB
41.0 dB
41.0 dB
41.0 dB
40.8 dB
41.3 dB
41.4 dB
40.7 dB
41.0 dB
40.7 dB
40.5 dB
40.6 dB
40.1 dB
40.4 dB
NA
-8.7 dBmV
-7.3 dBmV
-7.5 dBmV
-7.3 dBmV
-7.5 dBmV
-7.8 dBmV
-7.8 dBmV
-7.9 dBmV
-7.9 dBmV
-7.3 dBmV
-7.6 dBmV
-8.4 dBmV
-8.0 dBmV
-8.1 dBmV
-8.5 dBmV
-8.6 dBmV
-8.7 dBmV
-8.8 dBmV
-8.0 dBmV
-7.9 dBmV
-8.0 dBmV
-7.7 dBmV
-7.8 dBmV
-7.8 dBmV
-7.1 dBmV
-7.1 dBmV
-7.8 dBmV
-7.7 dBmV
-8.1 dBmV
-8.3 dBmV
-8.2 dBmV
-8.8 dBmV
-6.9 dBmV
NA
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
Unknown
Unknown
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
OFDM
OFDM
AndrewCVille
Regular Visitor

Re: Upgraded to XB7 & Gigabit Internet but Maxing Out @ 30mbps

 

Upstream
Channel Bonding Value
1
2
3
Locked
Locked
Locked
35 MHz
29 MHz
22 MHz
5120
5120
5120
53.0 dBmV
53.5 dBmV
53.0 dBmV
QAM
QAM
QAM
ATDMA
ATDMA
ATDMA
AndrewCVille
Regular Visitor

Re: Upgraded to XB7 & Gigabit Internet but Maxing Out @ 30mbps

IndexUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords

CM Error Codewords
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
21293081
28301037
28307426
28313276
28320100
28325618
28331430
28337872
28055023
28349923
28355519
28362212
28368817
0
0
28387032
28393953
28399461
28342516
28409417
28414239
28419830
28426064
28431911
28438812
28444243
28450456
28455512
28462320
28467215
28471063
28473877
21293081
5551667
0
0
0
0
0
0
0
288596
0
0
0
0
0
0
0
0
0
63290
0
0
0
0
0
0
0
0
0
0
0
0
497
5551667
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
160
0
BruceW
Gold Problem Solver

Re: Upgraded to XB7 & Gigabit Internet but Maxing Out @ 30mbps

Several downstream power levels and SNR values are borderline or too  low, and upstream levels are too high. Network connection problems like this are often due to poor coax connections or damaged coax cable, usually in or near your home.

If you want to troubleshoot this yourself, please see Internet Troubleshooting Tips. If you can't find the problem or you'd rather have Comcast take care of it, call them at the phone number on your bill or 1-800-Comcast, or use one of the options on https://www.xfinity.com/support/contact-us/. Insist they send a tech out to identify the cause and correct it.

If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit unless you have their Service Protection Plan (https://www.xfinity.com/support/articles/service-protection-plan, closed to customers that don't already have it). If the trouble is due to a faulty Comcast rental device, or anything outside your home, you shouldn't be charged.