Not getting 50Mbps download speed

Hi, The speed test indicated the download speed is at around 35Mbps, while my plan should reach 50Mbps. I checked the cable modem status page. There are 8 channels running QAM256, symbol rate for each channel is a little above 5M symbols/sec, SNR is at 44-47db, the power level is close to zero dbmv.

Does this sound good, or the symbol rate / SNR is too low to reach 50Mbps? If I calculated it correctly, it should be 8bits/symbol(QAM256) * 5M symbol/sec * 8(channel) = 320Mbps theoretically?

Please help have a check,

Thanks,

Responses

tmittelstaedt

Problem solver

•

326 Messages

11 years ago

speed test from what? INside Comcast's network or out? When was it run? Is the modem running translation or not?

0

pherl

Visitor

•

3 Messages

11 years ago

Speed test from http://speedtest.comcast.net and http://www.speedtest.net/ for several times on different days, at different time (from 3pm to 3am). The results were consistent - maxed at 35 Mbps. I'm wondering if there's throttling on the comcast side.

0

CC_John

Retired Employee

•

1.9K Messages

11 years ago

Welcome pherl. The services for your account are handled thru the National Accounts Center. Please contact the support desk@ 1-866-511-6489 for assistance.

Thank You

0