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3300V+ has two expansion slots; each slot can be plugged into 4-port VoIP card,
ISDN-NTTE or ISDN-TE card. The VoIP card involves two kinds of interface: FXS and
FXO. The ISDN-NTTE card involves two kinds of interface: NT for port 1 and 3; TE or NT
(user configurable) for port 2 and 4. And ISDN-TE card involves 4-port TE mode. You can
deploy different VoIP/ISDN applications according to the requirements.
3.2.1 FXS and FXO
FXS (Foreign eXchange Station) and FXO (Foreign eXchange Office) are assembled with a
pair. A telecommunications line from an FXO device must be connected to an FXS device.
Similarly, an FXS device must be connected to an FXO device. For example, PSTN is FXS
equipment, and a telephone is FXO equipment.
As for the Private Branch Exchange (PBX), it is more special because it has both FXS and
FXO devices at the same time. Outside lines of the PBX are usually connected to the phone
line, at this case, the PBX acts as FXO equipment; inside lines of the PBX are usually
connected to telephones, so the PBX acts as FXS equipment.
Vigor3300V+ Series User's Guide
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