VigorIPPBX 3510 Series User’s Guide
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VigorIPPBX 3510 has two expansion slots; each slot can be plugged into 4-port PSTN card,
ISDN-NTTE or ISDN-TE card. The PSTN 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 PSTN/ISDN applications according to the requirements.
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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 VigorIPPBX 3510, it is more special because it has both FXS and FXO devices at the
same time. It can connect to the phone line to act as FXO equipment; and it can connect to
telephones to act as FXS equipment.
FXS card
This card can connect to the telephone, FAX machine, DECT Phone, and so on.
FXO card
This card can connect to PSTN lines and extension lines of PBX
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