Packet assembler/disassembler
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A Packet Assembler/Disasembler or PAD for short is a device which handles the packet assembly. PADs are extremely flexible devices; they handle to configure a computer's ports to suit a special equipment, both as to speed and screen addressing, rather like a Bulletin Board System (BBS). To be accurate, it is the BBS which mimics the PAD.
Computer users usually use a PAD when they own a terminal without packet-creating capabilities, and connect to a special PSS facility which handles the packet assembly for him.