Draytek VIGOR3300V+ User Manual page 49

FXS equipment
PSTN or inside lines of PBX
FXO equipment
Telephones, FAX machines and outside lines of PBX.
Based on the characteristics described above that the FXS equipment and the FXO
equipment must connect with each other, please pay special attention when you use FXS
card and FXO card.
FXS card
This card can connect to the telephone, FAX machine, outside lines of PBX and FXO port
on FXO card.
FXO card
This card can connect to PSTN, inside lines of PBX and FXS port on FXS cards.
Vigor3300V+ Series User's Guide
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