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Packet assembler/disassembler
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<p>A packet assembler/disassembler, abbreviated PAD is a communications device which provides multiple <a href="/facts/Asynchronous_serial_communication/amrIkBQR">asynchronous</a> terminal connectivity to an <a href="/facts/X.25/yaGPqw2Y">X.25</a> (packet-switching) network or host computer. It collects data from a group of terminals and places the data into X.25 packets (assembly). A PAD also does the reverse, it takes data packets from packet-switching network or host computer and returns them into a character stream that can be sent to the terminals (disassembly). A <a href="/facts/Frame_Relay_assembler%2fdisassembler/sXA4DAjV">Frame Relay assembler/disassembler</a> (FRAD) is a similar device for accessing <a href="/facts/Frame_Relay/bFdv0qIP">Frame Relay</a> networks. </p>