Updated high-speed internet isn't delivering performance anywhere near expectations
Updated high-speed internet isn't delivering performance anywhere near expectations
Federal law allows choosing your own modem. My setup uses the SB6141, but most cable providers cap speeds at 200 Mbps. A Docsis 3.1 model is recommended. I’ve heard Motorola works well, though I haven’t tried any of these devices since we have 150 Mbps service locally. Running a customer-built modem on Comcast is essential—they charge $11 monthly for their outdated combo. Keep in mind, Docsis 3.1 units aren’t inexpensive, likely around $150 or more. Also, I’m uncertain about compatibility with your ISP. Comcast maintains a list of tested and updated compatible models. I don’t know your ISP’s stance on customer-owned equipment; some are supportive, others advise caution, and we won’t assist further.
If the device reported 1.2Gbit to the modem, it might indicate a signal problem. I’d run some real downloads from services like Steam to check performance first. The varying results between speedtest.net and DSLReports point more toward an ISP or server issue rather than a local one.
I explored the subject further and discovered others shared the same problem. One suggested using the Windows Reset option (Win 10 → Settings → Update & Security → Recovery → Reset this PC). I attempted it, though I was hesitant about letting Windows reinstall itself. It succeeded! Speedtest.net still shows speeds near 400 Mbps, but DSL Reports gives me around 950 Mbps, which matches what I needed. Thanks for the assistance everyone! It seems to have been a configuration change in Windows. If anyone else faces this, a reset might help.
Occasionally latency pops up—it’s usually your modem. This device comes with a class-action claim against it.
The Docsis 3.0 specification supports Gigabit speeds, but actual performance varies. Most cable providers require Docsis 3.1, and none of the available cables meet the top-end requirements. The Docsis 3.0 standard suggests my SB6141 should exceed 300 Mbps, yet Comcast only offers up to 200 Mbps. This is typical industry practice. You might be mixing this with the Puma 6 chip technology, which was exclusive to Docsis 3.0 32-channel modems. Under the standard, these can reach up to 1.2 Gbps, but in reality, cable companies cannot achieve that. None of the Docsis 3.1 devices use the Puma 6 chip, so those models are likely safe—most seem to rely on Broadcom processors instead of Intel.
The CODA-45 models run PUMA 7. I possess a PUMA 7 device (Arris TG3482ER) in stock. It performs better than the Hitron CGNM-2250 but remains inferior to Broadcom systems.
When you choose to switch to a different modem, you'll need to contact Spectrum and update your MAC address on your account.