H31-341_V2.5 · Question #890
FXS and FXO are the names of ports used by analog telephone lines. FXO and FXS are always used in pairs.
The correct answer is A. True. Option A is correct because FXS (Foreign Exchange Station) and FXO (Foreign Exchange Office) are complementary interfaces - one provides the analog line signal and the other receives it, so they must work together. FXS is the port that supplies power, dial tone, and ringing…
Question
FXS and FXO are the names of ports used by analog telephone lines. FXO and FXS are always used in pairs.
Options
- ATrue
- BFalse
How the community answered
(50 responses)- A72% (36)
- B28% (14)
Explanation
Option A is correct because FXS (Foreign Exchange Station) and FXO (Foreign Exchange Office) are complementary interfaces - one provides the analog line signal and the other receives it, so they must work together. FXS is the port that supplies power, dial tone, and ringing voltage (found on PBX systems, ATAs, and wall jacks), while FXO is the port that receives those signals (found on phones and devices connecting to the PSTN). Option B is wrong because no analog telephone connection can function with only one side - an FXS port without an FXO counterpart (or vice versa) produces no working circuit.
Memory tip: Think of it as a plug-and-socket relationship. FXS = Supplies the line (the "socket" on the wall), FXO = Office or Outgoing (the device that plugs in and dials out). They always come in pairs, just like a plug and a socket.
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