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5Mbps down on 300Mbps plan - help!

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5Mbps down on 300Mbps plan - help!

Current plan - 300Mbps

Speedtest results - consistently ~9Mbps down and up

 

Modem: Netgear CM500 Docsis 3.0

Router: Linksys Velop 3-node system

 

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 37 651000000 Hz -6.3 dBmV 39.8 dB 0 0
2 Locked QAM256 33 627000000 Hz -5.9 dBmV 40 dB 0 0
3 Locked QAM256 34 633000000 Hz -5.7 dBmV 39.9 dB 0 0
4 Locked QAM256 35 639000000 Hz -6.5 dBmV 39.7 dB 0 0
5 Locked QAM256 36 645000000 Hz -6.4 dBmV 39.7 dB 0 0
6 Locked QAM256 38 657000000 Hz -6.8 dBmV 39.7 dB 0 0
7 Locked QAM256 39 663000000 Hz -6.5 dBmV 39.8 dB 0 0
8 Locked QAM256 40 669000000 Hz -6.6 dBmV 39.8 dB 0 0
9 Locked QAM256 25 579000000 Hz -6.7 dBmV 39.1 dB 0 0
10 Locked QAM256 26 585000000 Hz -5.7 dBmV 39.1 dB 0 0
11 Locked QAM256 27 591000000 Hz -5.3 dBmV 40.1 dB 0 0
12 Locked QAM256 28 597000000 Hz -5.4 dBmV 40.2 dB 0 0
13 Locked QAM256 29 603000000 Hz -4.9 dBmV 40.2 dB 0 0
14 Locked QAM256 30 609000000 Hz -5.8 dBmV 40 dB 0 0
15 Locked QAM256 31 615000000 Hz -5.5 dBmV 40 dB 0 0
16 Locked QAM256 32 621000000 Hz -5.4 dBmV 40.1 dB 0 0
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 6 5120 Ksym/sec 30400000 Hz 52.3 dBmV
2 Locked ATDMA 5 5120 Ksym/sec 36800000 Hz 52.3 dBmV
3 Locked ATDMA 7 5120 Ksym/sec 24000000 Hz 52.3 dBmV
4 Locked ATDMA 8 5120 Ksym/sec 17600000 Hz 52.3 dBmV

 

After 2 hours with Xfinity last night, unplugging and resetting EVERYTHING, there is no change to performance.  They told me at first the modem was the problem. This is a new Netgear modem and the power last night is similar to now.  Then they put me on hold for a while and finally came back and said there has been a crew in my area working on cut lines for 2 weeks.  No way to verify as there is no outage shown on any map. 

 

Not looking for gig speed... just something CLOSER to what i'm paying for.  I'm getting less than 5% of my expected download speed.

 

Any thoughts, recommendations, ideas appreciated.

 

 

 

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Expert

Re: 5Mbps down on 300Mbps plan - help!

The upstream power is too high / out of spec. And the downstream power is on the weak side. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.

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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