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Lightning7

join:2013-02-02
Brunswick, OH
reply to Jabbu

Re: [TWC] more SB6120 blue lights

So is my signal good? I mean look at 105 Mhz its got errors but why?


Jabbu
Premium
join:2002-03-06
10500000 Hz = 105 MHz = FM station.

Possible some FM is getting into the plant and creating some very minor errors and dropping the SNR 2db, which in reality is nothing. Your log shows correctable errors, which should not be "felt".

What was your total codeword count?

Lightning7

join:2013-02-02
Brunswick, OH
I have rebooted the modem and this is what it is now but still getting those errors in the 105 Mhz freq.

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 Correctables Uncorrectables
1 Locked QAM256 65 105000000 Hz 0.8 dBmV 38.2 dB 124 0
2 Locked QAM256 66 111000000 Hz 0.8 dBmV 39.5 dB 0 0
3 Locked QAM256 67 117000000 Hz -0.2 dBmV 38.4 dB 0 0
4 Locked QAM256 68 123000000 Hz -0.6 dBmV 39.0 dB 0 0
5 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
6 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
7 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
8 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked TDMA and ATDMA 1 2560 Ksym/sec 32000000 Hz 43.2 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


motorola870

join:2008-12-07
Arlington, TX
kudos:4
said by Lightning7:

I have rebooted the modem and this is what it is now but still getting those errors in the 105 Mhz freq.

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 Correctables Uncorrectables
1 Locked QAM256 65 105000000 Hz 0.8 dBmV 38.2 dB 124 0
2 Locked QAM256 66 111000000 Hz 0.8 dBmV 39.5 dB 0 0
3 Locked QAM256 67 117000000 Hz -0.2 dBmV 38.4 dB 0 0
4 Locked QAM256 68 123000000 Hz -0.6 dBmV 39.0 dB 0 0
5 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
6 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
7 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
8 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked TDMA and ATDMA 1 2560 Ksym/sec 32000000 Hz 43.2 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

it would be expected that you would get errors here and there on 105MHz as it is also used by FM radio which can cause noise on the cable system. My area uses frequencies from 783MH-813MHz and I have errors on 807MHz and 813MHz which are in the PCS bands so I too should have a small amount of noise but not a lot of noise.

Lightning7

join:2013-02-02
Brunswick, OH
whats your signal levels?


motorola870

join:2008-12-07
Arlington, TX
kudos:4
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 5 807000000 Hz -5.0 dBmV 35.3 dB 1005 0
2 Locked QAM256 1 783000000 Hz -2.9 dBmV 37.6 dB 56 0
3 Locked QAM256 2 789000000 Hz -3.5 dBmV 37.3 dB 105 0
4 Locked QAM256 3 795000000 Hz -4.0 dBmV 36.6 dB 211 0
5 Locked QAM256 4 801000000 Hz -4.3 dBmV 36.5 dB 381 0
6 Locked QAM256 6 813000000 Hz -4.9 dBmV 36.7 dB 707 0
7 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
8 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked TDMA and ATDMA 10 2560 Ksym/sec 33000000 Hz 42.5 dBmV
2 Locked TDMA and ATDMA 9 2560 Ksym/sec 36500000 Hz 42.5 dBmV
3 Locked TDMA and ATDMA 11 2560 Ksym/sec 29500000 Hz 42.5 dBmV
4 Locked TDMA and ATDMA 12 2560 Ksym/sec 24500000 Hz 42.5 dBmV

Lightning7

join:2013-02-02
Brunswick, OH
Not bad but your upstream is really good even though your downstream is -4 to -5 mostly. are you using the SBG6580? Earlier today my SNR was at 42 dB (usually that's what it is normally) but now it's between 37-39 dB. Why is that?


motorola870

join:2008-12-07
Arlington, TX
kudos:4
yes it is a SBG6580. There are swings in the SNR when the temperature changes especially when it goes from cold temps to hot temps which causes the cable to expand and contract.

Lightning7

join:2013-02-02
Brunswick, OH
I think it's Time Warner doing something because it always does that from time to time. In the past it did that. I doubt its the temp or weather cuz even in bad weather my signal is dead on perfect so. I think it boils down to the ISP (Time Warner Cable).


hobgoblin
Sortof Agoblin
Premium
join:2001-11-25
Orchard Park, NY
kudos:11
"I think it's Time Warner doing something because it always does that from time to time. In the past it did that. I doubt its the temp or weather cuz even in bad weather my signal is dead on perfect so. I think it boils down to the ISP (Time Warner Cable)."

So what issues are you having with your perfectly acceptable SNR levels.

Hob
--
"A foolish consistency is the hobgoblin of little minds."
- Ralph Waldo Emerson