From: mike c
Subject: Re: Cable Modem Question
References: <email@example.com> <3D7D3B8A.38255EC4@mfi.net>
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NNTP-Posting-Date: Wed, 11 Sep 2002 17:43:14 EDT
Date: Wed, 11 Sep 2002 17:49:21 -0400
In article <3D7D3B8A.38255EC4@mfi.net>, firstname.lastname@example.org says...
> Tony Pelliccio wrote:
> > In article ,
> > md_cola@even_link.net says...
> > >
> > > Ok Tony, I got questions (either you work for Cox or those modems give
> > > up more info than most customers need). I'm planning on getting one and
> > > a friend claims to get 800kbps up and down. Now when you say 2.560 Msym
> > > upstream rate at 26192000 Hz, I'm figuring one byte per symbol for 256
> > > QAM and all this sounds right. Is there error correction in the physical
> > > layer or is that still done furthur up the TCP/IP stack? What kind of
> > > compression is used? The 2.560 Msym up is shared by all the customers on
> > > the node, correct? So my friends slice is 800kbps. How many houses are
> > > passed in the node in this (Cox) system?
> > That's how they get the speed - using QAM.
> > > If your info came from the connection status, I'd like to know how you
> > > got it so I can talk my friend thru that for a comparison.
> > >
> > > Did I ask enough questions of my own in Jim's thread? Thanks for opening
> > > it up, Jim.
> > If you've got a SB-3100 or similar open a web browser to 192.168.100.1
> > Tony
> Cable modems use FQPSK, not QAM.
uh, i was splicing and activatig for TCI in Ft. Worth (Arlington), TX
and the info posted at the contractors office said they were using 256-
I've understand QPSK, but what is FQPSK? freq agile? hopping?