At least in the past it could be cost effective for a telephone customer to have a telephone with a number from a remote location. Usually because they made many numbers to phones located near that remote location. Such calls were considered local calls. So the savings in long distance charges were greater than the cost of the dedicated link from the Foreign Exchange to their office. So the FX part means Foreign Exchange i.e. the source of dial tone is not the local Central Office (CO). S is station - the telephone. O is office - the remote CO. All this dates to the days of electro-mechanical telephone switches when all the gee whiz tricks done by computer didn't exist. The "routing table" was wire wrapped on each switch.
> -----Original Message----- > From: Chuck's Long Road [mailto:[EMAIL PROTECTED]] > Sent: Friday, September 27, 2002 11:11 AM > 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=54336&t=54331 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
