7 ANALOG VOICE I/O CARD
3021M100-002
7-5
7.3.2 FXO and FXS Drivers
The FXS (Foreign eXchange Station) LID is used for connection to a telephone.
The FXS LID provides -48 VDC battery voltage, generates the ring signal and
supports Loop Start detection, Direct Inward Dialing (DID), and Flash Hook
signaling.
The FXO (Foreign eXchange Office) LID is used for connection to a central
Public Switched Telephone Network (PSTN) office. The FXO LID supports Loop
Start as well as Direct Inward Dialing (DID) and Flash Hook signaling. The FXO
also detects ringing, and is compatible with -24 or -48 VDC phone interfaces.
Both FXS and FXO LIDs may be used for direct connections to the PBX.
Both LIDs support 2-wire connections via RJ-12 port connectors. Line impedanc
for the FXO and FXS LIDs is software-configurable for 600 Ohms, 900 Ohms, or
AT&T compromise impedance.
7.4 Voice LID Signal Handling
The following tables describe the signal outputs for North America and Europe
for the 6-pin RJ-12 connector and the 8-pin PB-45 connectors. The FXO
detects -48V and ringing signals. It can also connect to a PBX.
Table 7-3 Voice Connector Signal Output (RJ-12)
6-pin North American European
1 E E
2T1 RxA
3R TxB
4T TxA
5R1 RxB
6M M
Table 7-4 Voice Connector Signal Output (PB-45)
8-pin North American European
1 M M
2E E
3T1 RxA
4R TxB
5T TxA
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