Contributor
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18 Messages
Are these good modem signal values?
Yesterday I upgraded my internet to 400Mbs down, and when I do a speedtest, the results are actually much lower than what I was getting before on my 200Mb plan. I've rebooted my modem, and I plan to call and schedule a tech but was curious if these signal values are ok?
1 | Locked | QAM256 | 21 | 483000000 Hz | -10.8 dBmV | 38.1 dB | 6102 | 789 |
2 | Locked | QAM256 | 17 | 459000000 Hz | -10.1 dBmV | 38.7 dB | 3245 | 711 |
3 | Locked | QAM256 | 18 | 465000000 Hz | -10.0 dBmV | 38.7 dB | 3225 | 922 |
4 | Locked | QAM256 | 19 | 471000000 Hz | -10.3 dBmV | 38.5 dB | 8031 | 1003 |
5 | Locked | QAM256 | 20 | 477000000 Hz | -10.5 dBmV | 38.2 dB | 8003 | 753 |
6 | Locked | QAM256 | 22 | 489000000 Hz | -11.1 dBmV | 38.0 dB | 4532 | 898 |
7 | Locked | QAM256 | 23 | 495000000 Hz | -11.0 dBmV | 37.8 dB | 2876 | 1169 |
8 | Locked | QAM256 | 24 | 507000000 Hz | -11.5 dBmV | 35.1 dB | 4092 | 816 |
9 | Locked | QAM256 | 25 | 513000000 Hz | -12.0 dBmV | 37.2 dB | 1847 | 670 |
10 | Locked | QAM256 | 26 | 519000000 Hz | -13.1 dBmV | 36.5 dB | 1855 | 668 |
11 | Locked | QAM256 | 27 | 525000000 Hz | -12.6 dBmV | 36.7 dB | 1846 | 737 |
12 | Locked | QAM256 | 28 | 531000000 Hz | -12.1 dBmV | 37.0 dB | 1836 | 649 |
13 | Locked | QAM256 | 29 | 537000000 Hz | -11.9 dBmV | 37.1 dB | 3231 | 750 |
14 | Locked | QAM256 | 30 | 543000000 Hz | -11.6 dBmV | 37.3 dB | 3088 | 1152 |
15 | Locked | QAM256 | 31 | 555000000 Hz | -12.0 dBmV | 36.9 dB | 1940 | 660 |
16 | Locked | QAM256 | 32 | 561000000 Hz | -12.8 dBmV | 36.7 dB | 1945 | 857 |
Channel | Lock Status | US Channel Type | Channel ID | Symbol Rate | Frequency | Power |
1 | Locked | ATDMA | 4 | 5120 Ksym/sec | 35600000 Hz | 54.0 dBmV |
2 | Locked | ATDMA | 5 | 5120 Ksym/sec | 29200000 Hz | 54.0 dBmV |
3 | Locked | ATDMA | 6 | 5120 Ksym/sec | 22800000 Hz | 54.0 dBmV |
4 | Locked | ATDMA | 7 | 5120 Ksym/sec | 16400000 Hz | 54.0 dBmV |
EG
Expert
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103.5K Messages
3 years ago
Both power levels are out of spec. And the SNR is low on some of the downstream channels is low. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
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RolloTomasi
Contributor
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18 Messages
3 years ago
Thank you for the great advice.
There are currently 3 cables coming off the amp/splitter in the drop on the outside of the house...1 cable for each level of the house. All the wiring is in the walls so I don't know if there are other spitters or not, but I've only found cable outlets in 3 rooms, so maybe no splitters exist???
The 3 cables going into the house from the drop go right into brick and then disappear in walls. I will schedule a technician.
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RolloTomasi
Contributor
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18 Messages
3 years ago
Hey one more question for you...the modem is connected to a wall jack that's on the complete opposite end of the house from where the drop is. Could that distance affect the signal values? Should I install an amp on the wall jack?
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EG
Expert
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103.5K Messages
3 years ago
If that actually is an amp / powered splitter on the line outside, ensure that it is powered on. If you do get a tech visit, good luck with it ! Please post back with how things turn out.
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EG
Expert
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103.5K Messages
3 years ago
O/k, fair enough.
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RolloTomasi
Contributor
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18 Messages
3 years ago
Oh yes, the amp is powered. If it isn't I get no internet service at all!!! I ran the power myself.
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EG
Expert
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103.5K Messages
3 years ago
Distance can affect / weaken the signals, but it shouldn't be that much. Perhaps there is an impairment with that cable run. Don't install any more amps ! I would let a tech investigate / decide what is needed.
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RolloTomasi
Contributor
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18 Messages
3 years ago
By chance did you see my other question above about the distance of the wall jack from the outside drop?
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RolloTomasi
Contributor
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18 Messages
3 years ago
So tech came yesterday and made a ton of changes.
For starters he got rid of the commscope amp that was in the outside drop. he said signals were good and that it's not longer needed. He said since 2015 when the drop / amp was installed, the signal from the head end has gotten much stronger and an amp no longer needed.
Then the signal on the new wall jack I was going to move my modem to was very noisy. He swapped connectors to no avail, so we ended up running a new cable along the outside of the house and into the wall...and problem solved. modem levels are now good.
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EG
Expert
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103.5K Messages
3 years ago
For curiosity, can you post what they look like now please ?
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