Visitor
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14 Messages
Normal Signal Levels
What are the in-spec levels? I'm getting inconsistent connectivity (I remain on the zoom call, but keep getting an "unstable connection" warning. Using an Arris Surfboard and Asus ZenWifi Mini
he statuses listed show the connection state of the cable modem. They are used by your service provider to evaluate the operation of the cable modem.
| Startup Procedure | ||
|---|---|---|
| Procedure | Status | Comment |
| Acquire Downstream Channel | Locked | |
| Connectivity State | OK | Operational |
| Boot State | OK | Operational |
| Configuration File | OK | |
| Security | Enabled | BPI+ |
| DOCSIS Network Access Enabled | Allowed | |
| Downstream Bonded Channels | ||||||||
|---|---|---|---|---|---|---|---|---|
| Channel | Lock Status | Modulation | Channel ID | Frequency | Power | SNR | Corrected | Uncorrectables |
| 1 | Locked | QAM256 | 30 | 675000000 Hz | 16.0 dBmV | 36.6 dB | 0 | 0 |
| 2 | Locked | QAM256 | 15 | 591000000 Hz | 17.6 dBmV | 37.7 dB | 0 | 0 |
| 3 | Locked | QAM256 | 16 | 597000000 Hz | 17.5 dBmV | 37.7 dB | 0 | 0 |
| 4 | Locked | QAM256 | 17 | 603000000 Hz | 17.3 dBmV | 37.6 dB | 0 | 0 |
| 5 | Locked | QAM256 | 18 | 609000000 Hz | 17.0 dBmV | 37.4 dB | 0 | 0 |
| 6 | Locked | QAM256 | 19 | 615000000 Hz | 17.0 dBmV | 37.4 dB | 0 | 0 |
| 7 | Locked | QAM256 | 20 | 621000000 Hz | 17.0 dBmV | 37.3 dB | 0 | 0 |
| 8 | Locked | QAM256 | 21 | 627000000 Hz | 17.0 dBmV | 37.3 dB | 0 | 0 |
| 9 | Locked | QAM256 | 22 | 633000000 Hz | 16.7 dBmV | 37.2 dB | 0 | 0 |
| 10 | Locked | QAM256 | 23 | 639000000 Hz | 16.6 dBmV | 37.1 dB | 0 | 0 |
| 11 | Locked | QAM256 | 24 | 645000000 Hz | 16.5 dBmV | 37.1 dB | 0 | 0 |
| 12 | Locked | QAM256 | 25 | 651000000 Hz | 16.6 dBmV | 37.0 dB | 0 | 0 |
| 13 | Locked | QAM256 | 26 | 657000000 Hz | 16.4 dBmV | 37.0 dB | 0 | 0 |
| 14 | Locked | QAM256 | 27 | 663000000 Hz | 16.1 dBmV | 36.9 dB | 0 | 0 |
| 15 | Locked | QAM256 | 28 | 669000000 Hz | 16.2 dBmV | 36.8 dB | 0 | 0 |
| 16 | Locked | QAM256 | 31 | 681000000 Hz | 15.9 dBmV | 36.6 dB | 1 | 0 |
| Upstream Bonded Channels | ||||||
|---|---|---|---|---|---|---|
| Channel | Lock Status | US Channel Type | Channel ID | Symbol Rate | Frequency | Power |
| 1 | Locked | ATDMA | 85 | 5120 Ksym/sec | 16300000 Hz | 37.5 dBmV |
| 2 | Locked | ATDMA | 86 | 5120 Ksym/sec | 22800000 Hz | 36.5 dBmV |
| 3 | Locked | ATDMA | 87 | 5120 Ksym/sec | 29200000 Hz | 36.5 dBmV |
| 4 | Locked | ATDMA | 88 | 5120 Ksym/sec | 35600000 Hz | 36.0 dBmV |
EG
Expert
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108.3K Messages
15 days ago
This may or may not be the root cause of the problem (YMMV) but it should be addressed regardless.
The downstream power is too high / out of spec. It may be over-driving the front-end receiver circuit of the modem. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
Is there a drop amplifier on the coax cable line leading to the modem ? If so, try removing / bypassing it and see. If not, you can try installing a -10 dB attenuator pad such as this one on the coax port on the rear of the modem to knock that power level down and see;
https://www.amazon.com/10-DB-Attenuator-Pad-Each/dp/B0013L56OK
Or you could have a Comcast tech come out to correct it.
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XfinitySara
Official Employee
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1.5K Messages
13 days ago
Hey there, @user_eabfd8! Thanks for coming to our Xfinity Community Forum with your signal level concerns. You've come to the right place! Between our helpful community members and Digital Care Team, we've got your back :) And we're awesome to work with because we'll always do whatever we can to help! Have you had a chance to review our Expert (EG's) feedback?
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user_eabfd8
Visitor
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14 Messages
9 days ago
I've ordered the attenuator, but haven't installed yet. This morning my downstream power seems to be in spec, but I'm still experiencing issues. See anything else out of line here?
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EG
Expert
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108.3K Messages
9 days ago
It's still too high. Over +10dB is too high. -7dB to +7dB is the desired range.
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