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DOCSIS, and downstream channels. Knowing is half the battle.
on April 30, 2016
Before purchasing, you should research your current cable ISP and find out how many channels they use for downstream. This modem has only 4 channels, the minimum allowed for a DOCSIS 3.0 modem. Comcast/Xfinity, for example, uses 8 channels. Since each channel has a maximum bandwidth, this modem can not handle the very fastest connections that Xfinity is offering, at least in my market. I recently upgraded to 175Mb/s down from Xfinity, but this modem was maxing out around 135 Mb/s. After researching, I found out the information I just shared about DOCSIS channels. I have since purchased the SB6141 model of this modem, that supports 8 channels. Be aware that Xfinity has announced that several of their markets will be upgraded to DOCSIS 3.1 by the end of 2016. If you live in a major metropolitan area, you might consider holding off on purchasing a new modem until those modems become available. Since upload speeds are often much slower on cable modems, I did not mention upstream channels. In the future, that may be another thing the consumer needs to start considering, if we ever see upload speeds breaking into the 100+Mb/s barrier for residential cable users.
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