Direct Mode Application; Figure 4-9. Plar Mode Application - ADTRAN Express 5200 User Manual

Chapter 4. Applications

Direct Mode Application

Direct mode is used to set up a typical FXS/FXO extension
arrangement. In this mode, the local unit is connected to a PBX via
an FXO module. The remote unit uses an FXS module to connect
the telephone sets. In this arrangement, the local PBX extensions
are extended across the frame relay or point-to-point DDS circuit.
In direct mode, the Express 5200 is transparent to the telephone
circuit. All signalling information is generated/detected by the
attached PBX/telephone.
For direct mode, the DLCI for each voice port must be pro-
grammed. In the case of a frame relay circuit, this is the local DLCI
that the voice data is to be carried on. For a point-to-point circuit,
the DLCI value must be non-zero and it must be the same on both
ends of the circuit. See Figure 4-10.
4-16

Figure 4-9. PLAR Mode Application

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