3Com Router Module Guide
Chapter 2 Smart Interface Cards
2-26
access and handle 1/2 channel(s) of analog voice signals over data communication
networks. The differences between FXS SIC and FXO SIC are listed below:
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FXS SIC cards are analog subscriber line cards that provide ordinary analog
telephone and fax access and also can connect AT0 loop trunks of exchanges;
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FXO SIC cards are loop trunk cards that provide access of common subscriber
lines of exchanges.
Caution:
While using FXS SIC/FXO SIC, you must ensure that the 3Com Routers can be connected to IP
networks or other WANs.
2.7.2 Appearance
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Router 1-Port FXS/FXO SIC
Figure 2-25
Router 1-Port FXS/FXO SIC
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Router 2-Port FXS/FXO SIC
Figure 2-26
Router 2-Port FXS/FXO SIC
