Bits Per Second Explained

Prem44433 · 发表于 2019-05-01 11:40:28

The meaning of bit rates (Kbps, Mbps & Gbps) and which is fastest[br][br][br]

[br][br]The data rate of a network connection is normally measured in units of bits per second, generally abbreviated as bps instead of b/s. Network equipment manufacturers rate the maximum network bandwidth level their products support using the standard units of Kbps, Mbps, and Gbps.[br][br][br]These are sometimes called internet speed units because as network speeds increase, it's easier to express them in thousands (kilo-), millions (mega-) or billions (giga-) of units at once.[br][br]Definitions[br]Since kilo- is to mean a value of one thousand, it's used to denote the lowest speed from this group:[br][br]One kilobit per second equals 1,000 bits per second. This is sometimes written as kbps, Kb/sec or Kb/s but all of them carry the same meaning. [br]One megabit per second equals 1000 Kbps or one million bps. It's also expressed as Mbps, Mb/sec, and Mb/s.[br]One gigabit per second equals 1000 Mbps, one million Kbps or one billion bps. It's also abbreviated as Gbps, Gb/sec, and Gb/s.[br]Avoiding the Confusion Between Bits and Bytes[br]For historical reasons, data rates for disk drives and some other non-network computer equipment are sometimes shown in bytes per second (Bps with an uppercase B) rather than bits per second (bps with a lowercase 'b'). [br][br]one KBps equals one kilobyte per second[br]one MBps equals one megabyte per second[br]one GBps equals one gigabyte per second[br][br]Because one byte equals eight bits, converting these ratings to the corresponding lowercase 'b' form can be done simply multiplying by 8:[br][br]one KBps equals 8 Kbps[br]one MBps equals 8 Mbps[br]one GBps equals 8 Gbps[br]To avoid confusion between bits and bytes, networking professionals always refer to network connection speeds in terms of bps (lowercase 'b') ratings.[br][br]Speed Ratings of Common Network Equipment[br]Network gear with Kbps speed ratings tends to be older and low-performance by modern standards. Old dial-up modems supported data rates up to 56 Kbps, for example.[br][br]Most network equipment features Mbps speed ratings.[br][br]Home internet connections can range from low values like 1 Mbps up to 100 Mbps and even higher[br]802.11g Wi-Fi connections rate at 54 Mbps[br]Older Ethernet connections rate at 100 Mbps[br]802.11n Wi-Fi connections rate at 150 Mbps, 300 Mbps, and higher increments[br]High-end gear features Gbps speed rating:[br][br]Gigabit Ethernet supports 1 Gbps[br]Backbone network links that feed internet providers and cell towers support several Gbps[br]What Comes After Gbps?[br]1000 Gbps equals 1 terabit per second (Tbps). Few technologies for Tbps speed networking exist today.[br][br]The Internet2 project has developed Tbps connections to support its experimental network, and some industry companies have also built testbeds and successfully demonstrate Tbps links.