Regular Visitor
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4 Messages
Calibrate Power Levels
I have a SB8200 with connection issues and random slow speeds. I am trying to get my power levels calibrated as stated by the Arris customer support (Downstream between 15dBmV and -15dBmV but as close to 0 as possible / Upstream between 45dBmV and 51dBmV. One channel is not locked and the other has correctable and uncorrectable errors (uncorrectable not showing because I rebooted the modem right before taking a screenshot). The Event Log is geting errors randomly throughtout the day. According to Arris support Comcast/Xfinity should be able to calibrate my signal levels remotely. How do I get them to do this? I had a tech come out. He added a splitter but issues remain. I have been on chat and the phone many times with tech support only to still have issues.
Channel ID | Lock Status | Modulation | Frequency | Power | SNR/MER | Corrected | Uncorrectables |
9 | Locked | QAM256 | 507000000 Hz | -7.4 dBmV | 39.8 dB | 0 | 0 |
1 | Locked | QAM256 | 453000000 Hz | -7.9 dBmV | 39.6 dB | 0 | 0 |
2 | Locked | QAM256 | 459000000 Hz | -7.8 dBmV | 39.6 dB | 0 | 0 |
3 | Locked | QAM256 | 465000000 Hz | -8.0 dBmV | 39.4 dB | 0 | 0 |
4 | Locked | QAM256 | 471000000 Hz | -7.7 dBmV | 39.6 dB | 0 | 0 |
5 | Locked | QAM256 | 477000000 Hz | -7.5 dBmV | 39.7 dB | 0 | 0 |
6 | Locked | QAM256 | 483000000 Hz | -7.5 dBmV | 39.6 dB | 0 | 0 |
7 | Locked | QAM256 | 489000000 Hz | -7.2 dBmV | 39.8 dB | 0 | 0 |
8 | Locked | QAM256 | 495000000 Hz | -7.3 dBmV | 39.7 dB | 0 | 0 |
10 | Locked | QAM256 | 513000000 Hz | -7.6 dBmV | 39.6 dB | 0 | 0 |
11 | Locked | QAM256 | 519000000 Hz | -7.9 dBmV | 39.5 dB | 0 | 0 |
12 | Locked | QAM256 | 525000000 Hz | -8.3 dBmV | 39.3 dB | 0 | 0 |
13 | Locked | QAM256 | 531000000 Hz | -8.4 dBmV | 39.2 dB | 0 | 0 |
14 | Locked | QAM256 | 537000000 Hz | -8.8 dBmV | 39.1 dB | 0 | 0 |
15 | Locked | QAM256 | 543000000 Hz | -8.4 dBmV | 39.1 dB | 0 | 0 |
16 | Locked | QAM256 | 549000000 Hz | -8.9 dBmV | 38.9 dB | 0 | 0 |
17 | Locked | QAM256 | 555000000 Hz | -8.4 dBmV | 39.1 dB | 0 | 0 |
18 | Locked | QAM256 | 561000000 Hz | -8.5 dBmV | 39.2 dB | 0 | 0 |
19 | Locked | QAM256 | 567000000 Hz | -8.2 dBmV | 39.2 dB | 0 | 0 |
20 | Locked | QAM256 | 573000000 Hz | -8.0 dBmV | 39.5 dB | 0 | 0 |
21 | Locked | QAM256 | 579000000 Hz | -7.8 dBmV | 39.5 dB | 0 | 0 |
22 | Locked | QAM256 | 585000000 Hz | -7.4 dBmV | 39.6 dB | 0 | 0 |
23 | Locked | QAM256 | 591000000 Hz | -7.3 dBmV | 39.8 dB | 0 | 0 |
37 | Locked | Other | 690000000 Hz | -8.6 dBmV | 35.8 dB | 323718853 | 0 |
38 | Not Locked | QAM256 | 0 Hz | 0.0 dBmV | 40.4 dB | 0 | 0 |
39 | Locked | QAM256 | 423000000 Hz | -6.7 dBmV | 40.2 dB | 0 | 0 |
40 | Locked | QAM256 | 429000000 Hz | -7.1 dBmV | 40.1 dB | 0 | 0 |
41 | Locked | QAM256 | 435000000 Hz | -6.9 dBmV | 39.7 dB | 0 | 0 |
42 | Locked | QAM256 | 447000000 Hz | -7.6 dBmV | 40.3 dB | 0 | 0 |
43 | Locked | QAM256 | 399000000 Hz | -6.7 dBmV | 40.3 dB | 0 | 0 |
44 | Locked | QAM256 | 405000000 Hz | -6.6 dBmV | 40.3 dB | 0 | 0 |
45 | Locked | QAM256 | 411000000 Hz | -6.7 dBmV | 40.3 dB | 0 | 0 |
Channel | Channel ID | Lock Status | US Channel Type | Frequency | Width | Power |
1 | 3 | Locked | SC-QAM Upstream | 22800000 Hz | 6400000 Hz | 42.0 dBmV |
2 | 1 | Locked | SC-QAM Upstream | 35600000 Hz | 6400000 Hz | 43.0 dBmV |
3 | 2 | Locked | SC-QAM Upstream | 29200000 Hz | 6400000 Hz | 43.0 dBmV |
4 | 4 | Locked | SC-QAM Upstream | 16400000 Hz | 6400000 Hz | 41.0 dBmV |
5 | 5 | Locked | SC-QAM Upstream | 39600000 Hz | 1600000 Hz | 43.0 dBmV |
DaElephant
Regular Visitor
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4 Messages
5 years ago
To add to this.
I have confirmed it is not an issue within my home. I checked the signal levels at the box on the side of the house with almost the excact same levels and problems.
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CCAndrew
Gold Problem Solver
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25.9K Messages
5 years ago
A tech adding a splitter is taking you further from zero, it adds to the upstream but takes away from downstream
Comcast uses its own range of signal levels, it doesn’t matter what Arris said. Everything is in Comcast’s specs except for that one channel not locking in and bad SNR on another. You’ll probably need a second tech, if you have negative downstream levels entering the house and you are sure there are no other splitters.
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DaElephant
Regular Visitor
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4 Messages
5 years ago
@CCAndrew
There are 2 splitters. That is the only way I can keep my internet from crashing every few minutes.
Since the tech comes out power cycles the modem then runs a speed test with good results, how do I convince them there is still a problem?
Also, if Comcast has there own specs why are the levels in the troubleshooting video exactly where mine need to be (about -4 Downstream and 48 Upstream)?
https://www.youtube.com/watch?v=cGmKbNGzJKM
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CCAndrew
Gold Problem Solver
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25.9K Messages
5 years ago
If you’re missing a downstream channel and bad SNR on another, those aren’t good results. What are your levels at the ground block or before any splitters? It’s just part of troubleshooting. Also, what type of splitters, 2,3,4,8 way?
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DaElephant
Regular Visitor
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4 Messages
5 years ago
@CCAndrew - Thank you for your time.
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