Subject: Re: Cable Modem Question
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NNTP-Posting-Date: Mon, 09 Sep 2002 09:37:09 EDT
Date: Mon, 9 Sep 2002 09:44:00 -0400
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.
In article , tonypo1
> 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