John Neiberger wrote: > > 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?
No, that's backwards. A phone connects to an FXS port on a router. I remember this because a phone is an office device. That's just my trick, but technically, from what I have been told, a phone actually is an FXO. FXS connects to FXO and vice versa, just like the DTE/DCE example. > > A PBX, using a trunk line, connects to the FXS port? No, that's backwards too. You would use an FXO port in this case. Priscilla > > 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=54353&t=54331 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
