[Year 12 IT Apps] Re: Modems and Routers thread..

[Kent Beveridge]

Thanks for that Russell.
 
Kent Beveridge,
I.T. co-ordinator
St. Brigids Catholic Sec. College
Horsham
email.. kbeveridge at stbc.vic.edu.au
 
|<3|\|7  b3\/3r1D93 ?  ;-)

Wishes and Eggs, one you make and one you break!  A bit like promises.....
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________________________________

From: itapps-bounces at edulists.com.au on behalf of Russell Edwards
Sent: Tue 10/16/2007 9:14 AM
To: Year 12 IT Applications Teachers' Mailing List
Subject: [Year 12 IT Apps] Re: Modems and Routers thread..




On 15/10/2007, at 4:36 PM, Kent Beveridge wrote:

> Scuse my ignorance, but where would a multiplexor fit here, or 
> wouldnt it? Yep, I know its not the question, but now I just got 
> curious!

A multiplexor is a device for sending more than one communication 
"channel" (virtual dedicated connection) down a single physical 
connection.  Nowadays most network traffic is packet switched so this 
does the multiplexing by default-- the packet header identifies which 
"channel" it pertains to and the actual data link just sees packets 
without caring what's in them.   This would be a form of "time 
division" multiplexing.   Another type of multiplexing is frequency 
division. This is how DSL works on a phone line. Voice and dial codes 
etc all take up a different part of the frequency spectrum to the DSL 
modulation... Roughly (off the top of my head), the boundary is at 
about 8 kHz, and the "line filter" you have to use on any handsets is 
to enforce that cutoff so that there's no interference between the 
DSL and voice services.  Sending more than one signal down an optical 
fibre using different wavelengths of light is another example, as is 
sending multiple signals across a given band in the radio spectrum as 
in wireless networking or mobile phones.

Russell



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