Specifications

Digium, Inc.
There are multiple standard configurations in which an 800 S
may be purchased. Each configuration consists of one to f
FXO modules. These modules are identified by their color
„ FXS - Foreign Exchange Station (Green Modules)
„ FXO - Foreign Exchange Office (Red Modules)
This chapter provides an in-depth review of the two module
their uses within your Asterisk server.
Note: Only qualified service personnel should install t
should not attempt to perform this function themselves
FXS Module
The FXS module allows an 800 Series card to initiate and
voltage to an FXO device such as an analog telephone.
FXO Module
The FXO module allows an 800 Series card to terminate an
lines (POTS). Because of the modular design, you can acti
ports at any time with more FXS or FXO daughter cards.
module passes all the call features any standard analog tele
support. The phone receiving the call is the last FXO devic
When it receives voltage from an FXS device, the phone r
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