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Graymin
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Contributor

 • 

21 Messages

Sat, Jun 19, 2021 5:17 AM

1200 Mbps only after a manual power cycle

Hey guys my 1200 Mbs drops to 90 Mbs or lower, I unplug the modem and back in and I get the 1200+ Mbs some times it stays  for a few hour but most of the time it drops down after about a half hour tech checked my line speed was getting 1300+ on it I was hopping it would clear up after all the Meantness that was show in my area but still not getting full speed unless I power cycle the modem

 

Question

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Updated 

2 m ago

141

4

0

Responses

Accepted Solution

BruceW

Gold Problem Solver

 • 

22.9K Messages

3 m ago

Are you connecting via Wifi or Ethernet? If Wifi, it's best to switch to an Ethernet cable connection if possible for testing. That would allow you to determine whether the problem is the Wifi signal or the link between your modem or gateway and Comcast's network. Network connection problems that affect both Ethernet and Wifi devices are often due to poor coax connections or damaged coax cable, usually in or near your home. Such problems are often intermittent, which makes them hard to find.

If you want to troubleshoot this yourself, please see https://forums.xfinity.com/conversations/your-home-network/connection-troubleshooting-tips/602da777c5375f08cdea3db9. If you still need help, please post the following information from your modem or gateway:

  • model number
  • downstream power levels and SNR
  • upstream power levels
  • event log, if accessible

If you can't find and fix the problem yourself there isn't much else you can do except keep leaning on Comcast until they take care of it.

1

Graymin

Contributor

 • 

21 Messages

3 m ago

@BruceW

Ya its Ethernet connection 2500/2500 linkspeed checked speed and 1384 Mbs this morn lol

and I didn't have to power cycle

Cable Modem

HW Version:2.0
Vendor:Technicolor
BOOT Version:S1TC-3.63.20.104
Core Version:1.0
Model:CGM4331COM
Product Type:XB7
Flash Part:8192 MB
Download Version:Prod_20.2_d31 & Prod_20.2
Serial Number:304930030296104645
Downstream
Channel Bonding Value
Index
20
17
18
19
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
Lock Status
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Frequency
555 MHz
537 MHz
543 MHz
549 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
651 MHz
657 MHz
663 MHz
669 MHz
675 MHz
681 MHz
687 MHz
693 MHz
699 MHz
705 MHz
711 MHz
717 MHz
805000000
SNR
39.3 dB
29.9 dB
30.8 dB
36.5 dB
42.3 dB
42.2 dB
42.1 dB
42.1 dB
42.2 dB
42.0 dB
41.9 dB
41.9 dB
41.7 dB
41.6 dB
41.6 dB
41.3 dB
41.6 dB
41.3 dB
41.5 dB
41.3 dB
41.4 dB
41.4 dB
41.6 dB
41.0 dB
41.4 dB
41.3 dB
41.4 dB
41.5 dB
41.5 dB
41.5 dB
41.5 dB
NA
Power Level
1.1 dBmV
1.0 dBmV
1.0 dBmV
1.1 dBmV
0.9 dBmV
0.7 dBmV
0.5 dBmV
0.5 dBmV
0.5 dBmV
0.5 dBmV
0.5 dBmV
0.4 dBmV
0.0 dBmV
0.1 dBmV
0.0 dBmV
0.0 dBmV
0.1 dBmV
0.0 dBmV
0.1 dBmV
0.2 dBmV
0.4 dBmV
0.1 dBmV
0.0 dBmV
0.1 dBmV
0.3 dBmV
0.5 dBmV
0.4 dBmV
0.3 dBmV
0.2 dBmV
0.1 dBmV
0.1 dBmV
NA
Modulation
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
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
Upstream
Channel Bonding Value
Index
1
2
3
4
5
Lock Status
Locked
Locked
Locked
Locked
Locked
Frequency
16 MHz
22 MHz
29 MHz
35 MHz
40 MHz
Symbol Rate
5120
5120
5120
5120
2560
Power Level
47.8 dBmV
48.0 dBmV
48.8 dBmV
48.8 dBmV
49.3 dBmV
Modulation
QAM
QAM
QAM
QAM
QAM
Channel Type
ATDMA
ATDMA
ATDMA
ATDMA
ATDMA
CM Error Codewords
Index
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
Unerrored Codewords
499817784
1069664972
1069674389
1069679951
1069687411
1069693232
1069701446
1069707016
1069715883
1069722883
1069729807
1069735892
1069743293
1069749886
1069757086
1069763625
1069775503
1069782405
1069789411
1069792997
1069799719
1069806327
1069812934
1069819574
1069826039
1069832727
1069839211
1069845688
1069850229
1069853657
1069858494
499817784
Correctable Codewords
450153312
3431
169
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
450153312
Uncorrectable Codewords
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
0

     

    This comment was created from this reply

    0

    0

    BruceW

    Gold Problem Solver

     • 

    22.9K Messages

    3 m ago

    The downstream signals look very good, except for the 537-543 MHz SNR, which is out of spec (too low).

    The upstream power levels are high-ish. If they are fluctuating above 50, that would cause problems. There are other signal values that only Comcast can check.

    Can only suggest you keep an eye on the upstream power readings, and/or have Comcast come back out for another look at the problem.

    Good luck, and please let us know how it goes!

    (edited)

    0

    Graymin

    Contributor

     • 

    21 Messages

    2 m ago

    well it was fine for a week now its back at having to reboot the modem every few hours guess its time for a tech to come out again

    3

    0

    EG

    Expert

     • 

    89.2K Messages

    @Graymin

    As an FYI here.

    Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.


    Good luck !

     

    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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    2 m ago

    0

    CL303

    Visitor

     • 

    1 Message

    did you get this resolved yet? we are having a similar issue where in the PM we either get constantly kicked offline with speed tests sitting at 10Mbps to 150Mbps. During the day we see upwards of 900Mbps but almost never the 1200. We've had multiple tech visits and they can't figure it out.

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    2 m ago

    0

    XfinityAlisha

    Official Employee

     • 

    131 Messages

    Hello, @CL303 We would love to assist you with your speed concerns. Please create your own public post outlining your troubles so, we can take a look! 

    I am an Official Xfinity Employee.
    Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
    We ask that you post publicly so people with similar questions may benefit from the conversation.
    Was your question answered? Please, mark a reply as the Accepted Answer.tick

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    2 m ago

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