Frequent Visitor
•
7 Messages
High Upstream/Downstream Power Levels
I have been experiencing severe internet drops to the point where my internet is rendered useless as it's impossible to even keep a steady connection. I contacted Comcast several times asking for help, and their only suggestion is that my internet is too slow to handle the usage load (which I know is bull because it's always been fine for the past 5-6 years), and to swap a new modem. I went to the Xfinity store today to swap out a new one, but the problem still persists. A technician came a bit back but said they couldn't do anything because they didn't detect any problems (blamed it on my internet speeds). I want to try and get another technician up, but what should I tell them so they can properly inspect my cables and such? Here are the Upstream and Downstream Levels:
|
Upstream
|
Channel Bonding Value | ||||||||
| Index |
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
|
|---|---|---|---|---|---|---|---|---|---|
| Lock Status |
Locked
|
Not Locked
|
Not Locked
|
Locked
|
Not Locked
|
Not Locked
|
Not Locked
|
Not Locked
|
|
| Frequency |
29.60 MHz
|
16.50 MHz
|
23.00 MHz
|
36.10 MHz
|
|
|
|
|
|
| Symbol Rate |
5120 KSym/s
|
0 KSym/s
|
0 KSym/s
|
5120 KSym/s
|
|
|
|
|
|
| Power Level |
53.00 dBmV
|
0.00 dBmV
|
0.00 dBmV
|
42.25 dBmV
|
|
|
|
|
|
| Modulation |
64 QAM
|
QPSK
|
QPSK
|
64 QAM
|
|
|
|
|
|
| Channel Type |
DOCSIS2.0 (ATDMA)
|
(Unknown)
|
(Unknown)
|
DOCSIS2.0 (ATDMA)
|
|
|
|
|
|
|
Downstream
|
Channel Bonding Value | ||||||||||||||||||||||||||||||||
| 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
|
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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
|
Not Locked
|
Not Locked
|
Not Locked
|
Not Locked
|
Not Locked
|
Not Locked
|
Not Locked
|
Not Locked
|
|
| Frequency |
525.00 MHz
|
453.00 MHz
|
459.00 MHz
|
465.00 MHz
|
471.00 MHz
|
477.00 MHz
|
483.00 MHz
|
489.00 MHz
|
495.00 MHz
|
501.00 MHz
|
507.00 MHz
|
513.00 MHz
|
519.00 MHz
|
531.00 MHz
|
537.00 MHz
|
543.00 MHz
|
549.00 MHz
|
555.00 MHz
|
561.00 MHz
|
567.00 MHz
|
573.00 MHz
|
579.00 MHz
|
585.00 MHz
|
591.00 MHz
|
|
|
|
|
|
|
|
|
|
| SNR |
40.37 dB
|
40.37 dB
|
40.37 dB
|
40.37 dB
|
40.95 dB
|
40.95 dB
|
40.37 dB
|
40.95 dB
|
40.95 dB
|
40.37 dB
|
40.37 dB
|
40.37 dB
|
40.37 dB
|
40.37 dB
|
40.37 dB
|
40.37 dB
|
40.37 dB
|
40.37 dB
|
38.61 dB
|
38.61 dB
|
40.37 dB
|
40.37 dB
|
40.95 dB
|
40.37 dB
|
|
|
|
|
|
|
|
|
|
| Power Level |
7.30 dBmV
|
6.70 dBmV
|
6.80 dBmV
|
7.00 dBmV
|
7.20 dBmV
|
7.30 dBmV
|
7.20 dBmV
|
7.40 dBmV
|
7.10 dBmV
|
7.10 dBmV
|
7.40 dBmV
|
7.30 dBmV
|
7.20 dBmV
|
7.00 dBmV
|
6.80 dBmV
|
6.50 dBmV
|
6.10 dBmV
|
5.40 dBmV
|
4.40 dBmV
|
4.20 dBmV
|
6.30 dBmV
|
7.20 dBmV
|
7.70 dBmV
|
7.90 dBmV
|
|
|
|
|
|
|
|
|
|
| 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
|
|
|
|
|
|
|
|
|
|
EG
Expert
•
110.4K Messages
5 years ago
The upstream power is too high / out of spec on channel 1. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the unbonding of the multiple bonded upstream channels (you only have one ).
In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
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huongquach11
Frequent Visitor
•
7 Messages
5 years ago
What should I address to them? Last time I had a technician come, they didn't really do much, so this time I want to give him some specific details that they could look at, instead of just running a diagnostic test and determining that there's nothing wrong.
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EG
Expert
•
110.4K Messages
5 years ago
Did any of the tips apply ?
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huongquach11
Frequent Visitor
•
7 Messages
5 years ago
Not really. I didn't find any splitters outside where the cable box is, neither did I find any leading to my modem inside my house. The rest of the wire they stuffed on the roof of my house that I can't locate.
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EG
Expert
•
110.4K Messages
5 years ago
Sorry that nothing helps you. When a tech comes out, show them this thread. Good luck with it ! Please post back with how things turn out.
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