Subject: Re: Cable Modem Question
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NNTP-Posting-Date: Mon, 09 Sep 2002 09:42:50 EDT
Date: Mon, 9 Sep 2002 09:49:42 -0400
In article ,
sorry, I replied to a post from toni and my reader assigned it to
someone else. the beginning of the thread is gone.
> Ok Toni, 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?
> 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.
> mike c
> In article , tonypo1
> @cox.takemeout2.net says...
> > In article <firstname.lastname@example.org>, Jim-
> > T@analog_innovations.com says...
> > > What is the operating frequency of Cable Modems?
> > >
> > > ...Jim Thompson
> > >
> > Cox Communications - Providence, RI
> > Frequency 747000000 Hz Locked
> > Signal to Noise Ratio 35 dB
> > QAM 256
> > Network Access Control Object ON
> > Power Level 0 dBmV The Downstream Power Level reading is a snapshot
> > taken at the time this page was requested. Please Reload/Refresh this
> > Page for a new reading
> > Upstream Value
> > Channel ID 4
> > Frequency 26192000 Hz Ranged
> > Ranging Service ID 1281
> > Symbol Rate 2.560 Msym/s
> > Power Level 47 dBmV