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TVP-221H User’s Guide
6
Chapter 6
Connection Considerations
This section discusses the special connection consideration for various environments and
situations where you can use the VoIP Gateway.
6.1 Port Configuration
VoIP Gateway supports FXS and FXO ports.
FXS (Foreign Exchange Station)
FXS provides power and ringing signals to its interfacing equipment. It is not
intended for connection to the Public Switched Telephone Network. It is a station
loop start operation that provides a connection to:
1. A standard, single-line analog telephone system
2. The line circuit of a key telephone system
3. A loop start trunk circuit of a Private Branch Exchange (PBX) that normally
connects to incoming Central Office circuits
FXO (Foreign Exchange Office)
FXO recognizes signals and draws current to indicate an active state. It is a trunk
loop start operation that emulates a single-line telephone to:
1. Central Office lines
2. PBX station
There are two basic environments that the TVP-221H can be applied to. They are
described in the following sections.
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