Yes, I think that's a great way to explain it. It helps with the telephony
example as well as helps newbies learning DTE/DCE. There's a discussion
about DTE/DCE going on right now in the Associates group. I was thinking
about using a telephone example to try to help.

I learned voice from Randy Fischer, a brilliant engineer and helpful teacher
who works for Advanced Network Information, a Cisco training partner. Well,
at least he used to work there. I haven't talked to him in ages.

His way to help us remember what goes into what is to always remember that
FXS talks to FXO and a telephone is office equipment. Look at  your desk.
You have a computer, a telephone. It's office equipment. So it plugs into an
FXS port. He says it better. It helped me anyway. ;-)

_______________________________

Priscilla Oppenheimer
www.troubleshootingnetworks.com
www.priscilla.com

Chuck's Long Road wrote:
> 
> Someone smarter than I made the following statements about FXO
> / FXS, in
> order to help me understand real world connectivity.
> 
> That person said to think of FXO / FXS as something analogous
> to DTE / DCE.
> 
> That is, DTE connects to DCE ( and visa versa ) and that FXO
> connects to FXS
> ( and visa versa )
> 
> In other words, an analog telephone set is an FXO device, and
> therefore
> plugs into an FXS port. The FXS port provides the signaling to
> the FXO
> device.
> 
> Similarly, a PBX, or a CO switch, for that matter, is an FXS
> device that
> provides signaling, and therefore plugs into an FXO port.
> 
> This seems to fit in with what I know - that you connect a
> router to a PBX
> or to the telco CO switch via an FXO port, and you connect an
> analogue fax
> or telephone into a router FXS port.
> 
> Any comments? Reasonable way to think of things?
> 
> Thanks.
> 
> Chuck
> 
> 




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