The Data Acquisition System (DAS) is a protocol designed by the Motorola for remote file manipulation. DAS is sometimes used to download billing data over HDLC LAPB from EMX-100, EMX-250, EMX-500 and EMX-2500 telephone switches. Advanced Relay's implementation conforms to the DAS specification as described in the DAS Output Tape Programmer's Guide 68P81055E32 dated April 28, 1986.
Advanced Relay has ported its DAS implementation to run on the PXS. For this application, the PXS is directly connected to a telephone switch as a front-end processor. Using HDLC LAPB, it downloads billing records from the switch and forwards them to a remote file server over TCP/IP where the records are written to disk. All of the details related to HDLC LAPB and the DAS protocol are handled inside the PXS. During operation, the PXS logs its activities to a remote log server.