switch stream造句

By mid 1981, these private circuit links had been replaced with dedicated 4-wire X25 circuits over the new public Packet Switch Stream ( PSS ) network operating at 4.8 kbit / s.
Originally the term PSDN referred only to Packet Switch Stream ( PSS ), an X . 25-based packet-switched network, mostly used to provide leased-line connections between local area networks and the Internet using permanent virtual circuits ( PVCs ).
Companies and individual users could connect in to the network, via a PSS ( Packet Switch Stream ) modem, or an X . 25 PAD ( Packet Assembler / Disassembler ), and a dedicated PSS line, and use it to connect to a variety of online databases and mainframe systems.
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