Release 1.0
Digium, Inc.
Page 37
Chapter 4
FXS and FXO Explained
Identification
There are multiple standard configurations in which the TDM400P card
may be purchased. Each configuration consists of one to four FXS and/or
FXO modules. These modules are identified by their color.
FXS
-Foreign Exchange Station (Green Modules for TDM400P)
FXO
-Foreign Exchange Office (Red Modules for TDM400P)
This chapter provides an in-depth review of the two module types and
their uses within your Asterisk server.
Note:
Only qualified service personnel should install the card. Users
should not attempt to perform this function themselves.
FXS Module
The FXS module allows the TDM400P card to initiate and send ringing
voltage to an FXO device.
FXO Module
The FXO module allows the TDM400P card to terminate analog
telephone lines (POTS).
Because of the modular design, you can activate additional ports at any
time with more FXS or FXO daughter cards. The FXO module passes all
the call features any standard analog telephone line will support. The
Summary of Contents for TDM400P
Page 1: ...TDM400P User s Manual June 28 2005 Release 1 0...
Page 12: ...Page 12 Digium Inc Release 1 0 Table Of Contents...
Page 30: ...Page 30 Digium Inc Release 1 0 Chapter 2 Card Installation...
Page 36: ...Page 36 Digium Inc Release 1 0 Chapter 3 Configuration...
Page 42: ...Page 42 Digium Inc Release 1 0 Chapter 5 Troubleshooting...
Page 48: ...Page 48 Digium Inc Release 1 0 Appendix A Pin Assignments...
Page 58: ...Page 58 Digium Inc Release 1 0 Appendix C Asterisk Configuration Commands...
Page 62: ...Page 62 Digium Inc Release 1 0 Appendix D Dial Plan Applications...
Page 72: ...Page 72 Digium Inc Release 1 0 Appendix E Glossary and Acronyms...