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Packet Switch Stream
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<p>Packet Switch Stream (PSS) was a <a href="/facts/Public_data_network/sMYs1t3f">public data network</a> in the United Kingdom, provided by <a href="/facts/British_Telecommunications/RV9sGpcD">British Telecommunications</a> (BT). It operated from the late 1970s through to the mid-2000s. </p>