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(GigaBits or GigaBytes per SECond) One billion bits or bytes per second. Gbps is a measurement of peripheral data transfer or network transmission speed. The correct abbreviation is "b" for bits and "B" for bytes; however, "b" and "B" are often interchanged. See space/time, Mbps and Kbps.

Lower case "b" - Gbps, Gb/sec, Gb/s
Gigabits per second is used to rate high-speed serial data transfers such as with SATA and SAS disk drives or high-speed network transmission such as Gigabit Ethernet and 10 Gigabit Ethernet.

Upper case "B" - GB/sec, GB/s
Gigabytes per second is used to rate high-speed parallel data transfers such as memory-to-memory.
References in periodicals archive ?
650 Group authored several forecast reports on the subject of 200 Gbps and 400 Gbps as well as 25 and 50 Gbps SERDES speeds.
Supports aggregate capacity of 40 Gbps - two pairs of SFP+ ports - can simulate two separate 10 Gbps full-duplex links - each emulation engine can simulate up to 15 different links.
In early 2004, Verizon Business demonstrated the world's first 40 Gbps IP transmission in a trial.