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Introduction 415
SmartWare Software Configuration Guide 36 • FXO interface configuration
Introduction
This chapter provides an overview of FXO interfaces and the tasks involved in configuring them. This chapter
does not explain the basic configuration steps common to all Context Switch (CS) interfaces. Information
about basic interface configuration can be found in chapter 33, “CS interface configuration” on page 381.
An FXO, Foreign eXchange Office, interface connects to an FXS, Foreign eXchange Subscriber, interface. These two
interfaces are used in analog telephony. The FXS interface is provided at the central office in order to connect to
telephones, modems, PBXs, faxes, etc. Telephones and modems are FXO interfaces and want to connect to the
central office. The FXO interface in the SmartNode products is like the telephone and modem interface.
In SmartWare, an FXO interface functions to connect the analog FXO port’s call signaling to the call control
process in SmartWare. Recall that an interface in SmartNode products is a logical device and a port is a physical
device. So the FXO feature consists of the logical interface with all its processes together with its configurable
parameters and the physical interface for the actual analog, 2-wire connection to an FXS device. There is a one-
to-one correspondence between the port and the interface.
In order for the interface to be able to make a connection over the 2-wire analog line, there must be a port bound
to the interface (see figure 58). For more information on ports, interfaces, and binding, see section “Interfaces,
Ports, and Bindings” on page 47. For specific details on binding the FXO port to an FXO interface, see section
“Bind FXO ports to higher layer applications” on page 543.
Figure 58. FXO interfaces on the CS context
This chapter includes the following sections:
• FXO services description (see page 416)
• Creating an FXO interface (see page 416)
• Deleting an FXO interface (see page 417)
• FXO interface configuration task list (see page 418)
Context CS
FXO Port
(physical)
FXO Interfaces
(logical)
“encapsulation cc-fxo”
and
"bind" commands
FXO Port
(physical)