In the VoIP world, just about all of the terminology comes from the
telco/PBX world.
The FXO interface connects to a PBX ( or PSTN ) and dial tone is obtained
from there
The FXS interface provides dial tone such that you can plug a phone directly
into it and call another phone connected via an FXS port on another router.
If you have a copy of Cisco Config Maker, you can put together scenarios and
get an idea of how it works.
I did a quick look through the new Cisco Press book Integrating Voice and
Data Networks, but could not find an index entry for either FXO, FXS, or
E&M, the other PBX interface you need to know if you are planning on doing
VoIP in conjunction with PBX's.
A quick search of CCO came up with a number of links.
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis2600/softw
are/voice.htm
watch the wrap
looks good for informational/eductional purposes
http://www.cisco.com/cpress/cc/td/doc/cisintwk/ita/itaf.htm
a vocabulary sheet. Excerpts below
FXO
Foreign Exchange Office. An FXO interface connects to the Public Switched
Telephone Network's (PSTN) central office and is the interface offered on a
standard telephone. Cisco's FXO interface is an RJ-11 connector that allows
an analog connection to be directed at the PSTN's central office or to a
station interface on a PBX.
FXS
Foreign Exchange Station. An FXS interface connects directly to a standard
telephone and supplies ring, voltage, and dial tone. Cisco's FXS interface
is an RJ-11 connector that allows connections to basic telephone service
equipment, keysets, and PBXes.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Austin
Sent: Saturday, November 11, 2000 7:37 PM
To: [EMAIL PROTECTED]
Subject: FXS and FXO?
What is the difference between FXS and FXO?
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