The 8-port FXO Adapter card supports the transport of an analog voiceband signal between two analog devices over a digital network.
The card supports analog voiceband signals through four RJ-45 connectors that provide eight Foreign Exchange Office (FXO) ports, with two ports supported per connector. The analog signals are converted into a 64 kb/s digital Pulse Code Modulation (PCM) format using either Mu-Law (North America) or A-Law (Rest of World) companding. The type of companding is selectable on a per-card basis. Companding conversion (that is, Mu-Law to A-Law or vice versa) is not supported.
The signaling type is selectable at the port level on a per-port basis depending on companding type.
FXO supports:
1511profile1 (1511 loop start) – A-Law companding
3600ls (loop start) – Mu-Law companding
3600re (remote extension) – A-Law companding
1511sn137 (1511 profile 137) – A-Law companding
The default signaling type is 3600ls for Mu-Law companding and 3600re for A-Law companding.