2. DEM: Analog E&M Card
2- or 4-wire selection can be made individually for each port through the jumpers P04,
P14, P24, P34.
4-wire configuration: A1 and B1 are omni-directional and they transmit voice, A2 and
B2 are also omni-directional and they receive voice.
2-wire configuration: A1 and B1 are used in transmitting and receiving voice, they are
bidirectional.
3. DDL : S0/T0 Basic Rate ISDN Card
Each port can be configured individually as a subscriber (S0) or a trunk (T0) through
the jumpers as shown below.
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