Isn't this the reverse of what Chuck posted? This is how I thought it
was at one time but later I thought I had it backwards. Now I think I'm
just really confused! Let me see if I have this right:
A phone, as an end-user device, is a station and hence an FXS device.
This connects to an FXO port on the router?
A PBX, using a trunk line, connects to the FXS port?
Perhaps I'm looking at this from the wrong perspective. An analogy
that helps me in another area: when choosing a router cable, DTE or DCE
is from the perspective of the router. Is it the same for FXS and FXO
ports? In other words, do FXO devices connect to FXS ports and vice
versa?
John
>>> "Haakon Claassen (hclaasse)" 9/27/02 11:57:16
AM >>>
FXS is a station (end device)
FXO is a trunk line
Haakon Claassen
EMEA - IT Transport Services -WAN
Cisco Systems
De Kleetlaan 6b - Pegasus Park
B-1831 Diegem (Belgium)
-----Original Message-----
From: Chuck's Long Road [mailto:[EMAIL PROTECTED]]
Sent: vrijdag 27 september 2002 18:11
To: [EMAIL PROTECTED]
Subject: OT: FXO FXS terminology - comments? [7:54331]
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
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=54350&t=54331
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