6-port E&M Adapter Card

The 6-port E&M Adapter card has six RJ-45 ports that support the transport of an analog voiceband signal between two analog devices over a digital network. 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 on a per-card basis. When either A-Law or Mu-Law companding is configured, Type I, Type II, or Type V signaling can be selected. However, the only supported configurations are both ends of the connection operating in the same mode (for example, Type I to Type I) or one end operating in Type I mode and the other in Type V mode. The default signaling type for Mu-Law is Type I and the default signaling type for A-Law is Type V.

Each voice port can be configured to operate in either a two-wire or four-wire (default) mode. The ports (in groups of three – ports 1 to 3 and ports 4 to 6) can also be configured to operate in transmission-only mode, which provides a four-wire audio path with no signaling. A transmit and receive transmission level point (the analog-to-digital decibel level) can be configured for each port. See Table: Configuration Options for the 6-port E&M Adapter Card for the signaling type, companding law, and audio wires configuration options on the 6-port E&M Adapter card.