At 2:04 PM -0700 7/7/2010, Jonas Ulrich wrote:
I've also been wondering about this. My provider just wanted a
docsis modem, so I paid $10 for the cheapest modem on ebay and am
getting 6mbps. I'm going to see if that is the limit of the modem,
or if that is my connection.
Ok. Technically...
DOCSIS 2.0 == 40 Mbps per channel downstream, 30 Mbps up.
DOCSIS 3.0 == 200 Mbps per channel downstream, 100 Mbps up.
It is rare when a cable company lets you bond multiple channels, so
the "per channel" stuff is mostly moot from your POV.
*However*
Those are max speeds, based on high quality modems, a *great*
signal-to-noise ratio over the coax drop, very few other modems on
your drop (coax run down the street), AND a good quality CMTS.
The CMTS (Cable Modem Termination System) is the so-called "Head
End". That is the router that your modem talks to, to make the hop
into the cable company's ethernet LAN. (Of course, this ignores
various node configurations, where they first convert your coax
signal to fiber to get down the big streets etc. It is this approach
that makes them "Hybrid Networks").
- Dan.
--
- Psychoceramic Emeritus; South Jersey, USA, Earth.
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