Hello Kem Hazarika,
This could be related to the something called Cable Signal Levels, can we get the Signal Level information to check if they’re within range?
In the below link you’ll find step by step how to check it and also a chart with the correct ranges:
http://arris.force.com/consumers/articles/General_FAQs/SVG2482AC-Cable-Signal-Levels
Cable signal levels for all DOCSIS cable modems require to be within the acceptable level for the modem operate properly. The three signal levels that need to be within the acceptable level are Downstream Power, SNR (Signal to Noise Ratio), and Upstream Power. Downstream Power refers to the line signal sent from the cable provider to cable modem. Downstream SNR (Signal to Noise Ratio) refers to the signal being sent in relation to the noise on the line. Upstream Power refers to the line signal from the cable modem to transmit data back to the cable provider. This document describes how to check the three signal levels to be within the acceptable level for the modem operate properly.
Checking Signal Level - Launch a web browser, such as Internet Explorer, Firefox, or Safari. Enter http://10.0.0.1 into the address box, and press the Enter key. The Login page will appear.
- On the Login page, enter admin in the Username field.
- Enter password in the Password field then click the Login button. The Gateway > At a Glance page will appear.
NOTE: A prompt to change the password appears when the SVG2482AC is using the default password. To change the password click the OK button or click the Cancel button to bypass it.
- On the left hand-menu, click the Connection link then click the XFINITY Network link on the sub-menu. The Gateway > Connection > XFINITY Network page will appear.
- In the Downstream section, verify Power levels are within the acceptable range of -15 dBmV to +15 dBmV for each downstream channel.
- In the Downstream section, identify the Modulation and Power to verify SNR levels are within the acceptable range for each downstream channel.
| Downstream Signal To Noise Ratio (SNR) | | Modulation | Power | Acceptable Downstream SNR | | 64QAM | -15 dBmV to 15 dBmV | 23.5 dB or greater | | 256QAM | -6 dBmV to 15 dBmv | 30 dB or greater | | -15 dBmV to -6 dBmV | 33 dB or greater |
- In the Upstream section, identify the Symbolic Rate to verify Upstream Power levels are within the acceptable range.
| Upstream Transmit Power Level | | Channel | US Channel Type | Symbol Rate | Acceptable Upstream Power Levels |
Single | TDMA | 1280 Ksym/sec | 45 dBmV to 61 dBmV | | ATDMA | 2560 Ksym/sec | 45 dBmV to 58 dBmV | | 5120 Ksym/sec | 45 dBmV to 57 dBmV |
Two | TDMA | 1280 Ksym/sec | 45 dBmV to 58 dBmV | | ATDMA | 2560 Ksym/sec | 45 dBmV to 55 dBmV | | 5120 Ksym/sec | 45 dBmV to 54 dBmV |
Three or more | TDMA | 1280 Ksym/sec | 45 dBmV to 55 dBmV |
ATDMA | 2560 Ksym/sec | 45 dBmV to 52 dBmV | | 5120 Ksym/sec | 45 dBmV to 51 dBmV |
- Refresh the page at least twice to identify variations in SNR, Downstream Power, and Upstream Power.
NOTE: If the either of the signal levels are outside of the acceptable range, power cycle or factory reset the gateway.
- Contact the cable provider to adjust the signal level to the acceptable level range if the signal levels are outside of the acceptable range.
Acceptable Signal Levels
| Acceptable Downstream Power Level | | -15 dBmV to +15 dBmV | | Downstream Signal to Noise Ratio (SNR) | | Modulation | Downstream Power | Acceptable Downstream SNR | | 64QAM | n/a | 23.5 dB or greater | 256QAM
| -6 dBmV to 15 BmV | 30 dB or greater | | -15 dBmV to -6 dBmV | 33 dB or greater | | Upstream Transmit Power Level | | Channel | US Channel Type | Symbol Rate | Acceptable Upstream Power Levels | | Single (1) | TDMA | 1280 Ksym/sec | 45 dBmV to 61 dBmV | | ATDMA | 2560 Ksym/sec | 45 dBmV to 58 dBmV | | 5120 Ksym/sec | 45 dBmV to 57 dBmV | | Two (2) | TDMA | 1280 Ksym/sec | 45 dBmV to 58 dBmV | | ATDMA | 2560 Ksym/sec | 45 dBmV to 55 dBmV | | 5120 Ksym/sec | 45 dBmV to 54 dBmV | | Three or more (>=)3 | TDMA | 1280 Ksym/sec | 45 dBmV to 55 dBmV | | ATDMA | 2560 Ksym/sec | 45 dBmV to 52 dBmV | | 5120 Ksym/sec | 45 dBmV to 51 dBmV |
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Thanks for your answer in advance.
Down Stream seems to be within range. Up Stream seems to be out of range? How do I upload the screen shot? Getting the “Please wait for your files to be uploaded” error.
Regards
Kem
Your power levels arn’t at good levels and y our channels are connecting at docsis 2.0 speeds.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
If you can, simply connect the modem right where the coax comes into the home. This prevents wiring in the home from being the issue. And some ISP’s charge if the wiring issue is in the home. So this helps prevent this.
