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From Wikipedia, the free encyclopedia

Multiples of bits
Decimal
Value SI
1000 103 kbit kilobit
10002 106 Mbit megabit
10003 109 Gbit gigabit
10004 1012 Tbit terabit
10005 1015 Pbit petabit
10006 1018 Ebit exabit
10007 1021 Zbit zettabit
10008 1024 Ybit yottabit
Binary
Value IEC JEDEC
1024 210 Kibit kibibit Kbit kilobit
10242 220 Mibit mebibit Mbit megabit
10243 230 Gibit gibibit Gbit gigabit
10244 240 Tibit tebibit -
10245 250 Pibit pebibit -
10246 260 Eibit exbibit -
10247 270 Zibit zebibit -
10248 280 Yibit yobibit -

The megabit is a multiple of the unit bit for digital information. The prefix mega (symbol M) is defined in the International System of Units (SI) as a multiplier of 106 (1 million),[1] and therefore

1 megabit = 106bits = 1000000bits = 1000 kilobits.

The megabit has the unit symbol Mbit.

The megabit is closely related to the mebibit, a unit multiple derived from the binary prefix mebi (symbol Mi) of the same order of magnitude,[2] which is equal to 220bits = 1048576bits, or approximately 5% larger than the megabit. Despite the definitions of these new prefixes for binary-based quantities of storage by international standards organizations, memory semiconductor chips are still marketed using the metric prefix names to designate binary multiples.

Using the common byte size of eight bits and the standardized metric definition of megabit and kilobyte, 1 megabit is equal to 125 kilobytes (kB) or approximately 122 kibibytes (KiB).

The megabit is widely used when referring to data transfer rates of computer networks or telecommunications systems. Network transfer rates and download speeds often use the megabit as the amount transferred per time unit, e.g., a 100 Mbit/s (megabit per second) Fast-Ethernet connection, or a 10 Mbit/s Internet access service, whereas the sizes of data units (files) transferred over these networks are often measured in megabytes. To achieve a transfer rate of one megabyte per second one needs a network connection with a transfer rate of eight megabits per second.

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Transcription

Usage

  • In telecommunications, the use of the SI definition of the unit is the standard.
  • In the semiconductor industry, it is still common practice to designate random-access memory (RAM), read-only memory (ROM) in a binary interpretation of the metric prefixes, such as the megabit, so that one megabit represents 220bits=1048576bits.[3][4][5] For example, a single discrete DDR3 chip specified at 512 Mb invariably contains 229 bits = 536870912bits = 512 Mibit of storage,[6] or 671088648-bit bytes, variously referred to as either 64 mebibytes or 64 (binary) megabytes.
  • During the 16-bit game console era, the megabit was a commonly used measure of the size (computer data storage capacity) of game cartridges. This size represented one mebibit (Mibit). The vast majority of SNES and Mega Drive (Genesis) games were produced on 8 megabit cartridges, although other sizes such as 4, 12, 16, 24, 32, and 48 megabit cartridges appeared. This usage continued on the Nintendo 64, with cartridge sizes ranging between 32 and 512 megabits.

References

  1. ^ The NIST Reference on Constants, Units, and Uncertainty: SI prefixes
  2. ^ The NIST Reference on Constants, Units, and Uncertainty: Prefixes for binary multiples
  3. ^ "DDR3 SDRAM Memory Product Guide" (PDF). Samsung Global. Retrieved 12 February 2015.
  4. ^ "S25FL128P Data Sheet" (PDF). Spansion Support. Retrieved 12 February 2015.
  5. ^ "1-Megabit (128K x 8) Paged Parallel EEPROMs" (PDF). Atmel Corporation. Retrieved 12 February 2015.
  6. ^ "JEDEC Standard DDR3 SDRAM Specification" (PDF, 8.8 MB). Retrieved 2008-07-10.
This page was last edited on 19 December 2020, at 15:58
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