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Definition: STP

(1) (Shielded Twisted Pair) Telephone wire that is wrapped in a metal sheath to eliminate external interference. See twisted pair.

(2) See spanning tree protocol and straight through processing.

(3) (Signal Transfer Point) A node in the SS7 telephone network that routes messages between exchanges and between exchanges and databases that hold subscriber and routing information. See SS7, SSP, SCP and AIN.

(4) (Serial ATA Tunneling Protocol) See serial attached SCSI.