| reply to urdrwho
Re: [Connectivity] what is unicast maintenance ranging In your next post, please include the information requested in the link:
»Comcast High Speed Internet FAQ »How To Get Help!
This will enable this forum's techies to perhaps help understand the problem. You should be able to access your modem's signals using »192.168.100.1 Look in your modem's manual if this doesn't work to find the URL for your modem.
I had a similar problem a couple of months ago. The CC tech discovered that the buried cable was defective. Replacement of the cable solved the problem. Other causes of the problems you're seeing could be corroded/lose connectors or something wrong at CC's plant. If you have a brand new installation of a new cable and household wiring, you shouldn't have wiring problems, but who knows.
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There is nothing more deceptive than an obvious fact.
Sherlock Holmes in
The Boscombe Valley Mystery
A. C. Doyle
Strand Magazine, October 1891 |
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Reviews:
 ·Verizon Online DSL
| I have all new coaxial cable coming into the house, a dedicated cable from the outside box to the modem.
As previously described it is intermittent, normally late afternoon but can occur other times.
My State is Pennsylvania
I have a D-Link router
Avast anti virus
Can't remember my exact tier around 3000/10000 I think.
Power - SNR - 7.3 dBmV 39.9 dB
Firmware - SBG6580-3.1.0.0-GA-07-180-NOSH
IF this is like Verizons intermittent problems, the company will never, ever admit that it is in the company office. My neighbors have all left Verizon DSL because of the intermittent issue. Yep ... they won't maintain the old copper.
Our cable wires are not buried wires, they are still the ones that hang from pole to pole. |
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 beachintechThere's sand in my tool bagPremium
join:2008-01-06
kudos:5 | can you post a screen shot of the signal stats page? I can't tell from your posts if that's + or - 7.3 and you didn't post the upstream power level.
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Ex-Tech at the Beach.
I speak for myself, not my former employer. |
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Reviews:
·Verizon Online DSL
| Here is the down and up
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR
1 Locked QAM256 2 735000000 Hz 7.1 dBmV 39.9 dB
2 Locked QAM256 1 729000000 Hz 7.3 dBmV 40.1 dB
3 Locked QAM256 3 741000000 Hz 7.3 dBmV 39.0 dB
4 Locked QAM256 4 747000000 Hz 6.9 dBmV 40.0 dB
5 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB
6 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB
7 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB
8 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 6 5120 Ksym/sec 28000000 Hz 50.7 dBmV
2 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
3 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
4 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV |
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beachintechThere's sand in my tool bagPremium
join:2008-01-06
kudos:5 Reviews:
 ·Comcast
| Your upstream is barely in spec for D3 for how hot your downstream signal is. Do you have an amp anywhere in line? If not you may be off a high value tap and need a tech to come out, evaluate losses to check they match what they should be off the tap, and adjust as necessary. Signal fluctuates (can't avoid it), you may be going out of spec and causing the modem to loose its connection.
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Ex-Tech at the Beach.
I speak for myself, not my former employer. |
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| The direct line from the box to my modem is 25>30 feet. Just last month they installed new cable and connector from the box to the modem. I need an AMP for that length? |
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beachintechThere's sand in my tool bagPremium
join:2008-01-06
kudos:5 | No, I didn't say you need an amp, I asked if you had one installed. This is a problem a tech will need to fix outside the home most likely.
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Ex-Tech at the Beach.
I speak for myself, not my former employer. |
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| I agree. Now to get them to do it is another thing. |
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| Pennsylvania
Moto SBG6580 modem/router gateway
Mcafee Total Prot
Tier: not sure, supposed to get 16 mbps down/ 4 mbps up
Firmware - SBG6580-3.1.0.0-GA-07-180-NOSH
just wanted to chime in that I have the exact same problem, down to the brand new wires and taps, etc. No more than 30 feet from pole to the sbg6580. No splitters, no amplifiers
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File
Security Enabled BPI+
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR
1 Locked QAM256 2 705000000 Hz 6.0 dBmV 39.9 dB
2 Locked QAM256 1 699000000 Hz 6.4 dBmV 39.9 dB
3 Locked QAM256 3 711000000 Hz 5.9 dBmV 38.9 dB
4 Locked QAM256 4 717000000 Hz 5.9 dBmV 39.5 dB
5 Locked QAM256 5 723000000 Hz 5.5 dBmV 39.4 dB
6 Locked QAM256 6 729000000 Hz 5.1 dBmV 39.3 dB
7 Locked QAM256 7 735000000 Hz 4.1 dBmV 38.8 dB
8 Locked QAM256 8 741000000 Hz 3.5 dBmV 37.9 dB
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 5 5120 Ksym/sec 30800000 Hz 39.0 dBmV
2 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
3 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
4 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
I get an assortment of errors in the log:
*No Ranging Response received
*Started Unicast Maintenance Ranging - No Response received (most common, happens approximately every 12 hours for last three days)
*SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
I posted the above not so much as to get help, but as a comparison to urdrwho's figures. Maybe we have the same problem? Have had CC techs here but each time they say there is no problem, because of course I have not lost connection while they are here. |
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| I should add that my gateway was purchased on December 5, 2011. |
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