Digital Access Signaling System 2 (DASS2) is a protocol defined by British Telecom for digital links to PSTN based on ISDN.
It is an improved version based on experiences with DPNSS.
... Francis Burton, (1821-1890), looking for the source of the Nile, discovered Lake Tanganyika
Richard E. Byrd, (1888-1957), explorer
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John Cabot (Giovanni Caboto) - ...