Analog communications

In case of analogic telephony accesses/lines, IPBbrick.GT can have a card as the one visible at Figure 6.2. This card can have different modules inserted:

FXS: Foreign eXchange Subscriber interface, to connect to telephones, modems, FAX's etc (GREEN MODULES);
FXO: Foreign eXchange Office interface, to connect to PSTN (RED MODULES);

At Figure 6.2 example, the two first interfaces are FXS and the last two are FXO. It's possible to see the connection between the module and the specific port. If you want to connect phones to the FXS ports, those ports should be powered on using the PW interface showed at Figure 6.2.

Note: The card jumpers should not be changed. The physical link is RJ-11.

**Figure 6.2:** Analog telephony card

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