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

[AndrewCVille]

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]

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]

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]

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.