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TVP-221H User’s Guide
78
Application 1: Special FXS Connections
The following diagram illustrates two different types of connections. The SITE A
FXS Connection shows the normal connection between a gateway and telephone
set (POTS) or FAX machine. The other type of FXS connection is shown on SITE
B, on the right hand side. The Connection between the gateway and PBX has a
special CO trunk interface card. The telephone sets connected to PBX can be
either POTS or digital telephone depending upon the PBX capability.
FXS Connection
w/ CO Trunk
Interface Card
TVP-224HR
TVP-221H
Site A
Site B
Normal FXS
Connection
Application 2: FXO Connections
Application 2 has three possible connections. One Site A, the FXS connection to
analog devices is normal and is identical to connections mentioned in Application
1. On Site B, the connection between PSTN and PBX is also a normal
connection. The last connection is between PBX and the gateway which uses the
internal analogue lines of the PBX. In this case, the FXO port has to be used.
Note: If a digital PBX is used, an analog terminal adapter is needed to provide an
analog interface to the FXO port. Please consult with your PBX supplier.
In this application, the caller on Site A, can make a call using a device connected
to a FXS port on the Site A gateway. The call will be routed to the Site B
Gateway, through a FXO port and passed on to the PBX system. The PBX
system will then forward the call to the dedicated terminal / extension.
TVP-224HR
TVP-221H
Site A
Site B
Normal FXS
Connection
Normal
FXO Connection