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Forum Discussion
Solved
Mechanism ISPs use to limit speed
Environment (residential): NETGEAR CM500 (self identifies as CM500100NAS, firmware is current=V1.01.12) DOCSIS 3.0, rated for up to 680Mbps (Xfinity supports this modem up to 300Mbps) All channel...
1. Have the ISP check the signal and line quality UP to the modem. Send a tech out.
A: wouldn’t line quality issues show up in the SNR values? Also, if there were line quality issues I would think I would see greater variability in speed performance. I was planning on requiring Xfinity to do a on-premise inspection after completing my due diligence & personal confidence affirming Xfinity has implemented correct service provisioning
2. Be sure there are no coax cable line splitters in the between the modem and ISP service box.
A: already done plus I tested at demark termination so there were no premise connections whatsoever.
3. Be sure your using good quality RG6 coax cable up to the modem.
A: New coax was installed by Xfinity about 10 years ago so I would be shocked if good quality coax was not used plus this would not account for my test results at the demark.
4. Be sure to power OFF the modem for 1 minute them back ON.
A: Done countless times
5. Note: all local network equipment used in these tests are 1Gbps rated
Have the ISP check the signal and line quality UP to the modem. Send a tech out.
Be sure there are no coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.
Be sure to power OFF the modem for 1 minute them back ON.
Be sure your testing with a wired PC directly connected to the CM modem. Disconnect any external wifi routers.
Be sure your PCs wired network adapter supports 1000Mpbs or 1Gb connection rate. Some older ethernet adapters only support 100Mbps.
1. Have the ISP check the signal and line quality UP to the modem. Send a tech out.
A: wouldn’t line quality issues show up in the SNR values? Also, if there were line quality issues I would think I would see greater variability in speed performance. I was planning on requiring Xfinity to do a on-premise inspection after completing my due diligence & personal confidence affirming Xfinity has implemented correct service provisioning
2. Be sure there are no coax cable line splitters in the between the modem and ISP service box.
A: already done plus I tested at demark termination so there were no premise connections whatsoever.
3. Be sure your using good quality RG6 coax cable up to the modem.
A: New coax was installed by Xfinity about 10 years ago so I would be shocked if good quality coax was not used plus this would not account for my test results at the demark.
4. Be sure to power OFF the modem for 1 minute them back ON.
A: Done countless times
5. Note: all local network equipment used in these tests are 1Gbps rated