計算機網絡 計算機存儲 單位 定義問題 （整合）
比特bit:二進制中的1或0
**速率: 連接在計算機網絡主機數字信道上傳送的速率，也稱數據率 data rate
單位 b/s(bit/s bps) kb/s Mb/s Gb/s Tb/s
100M 以太網省略了b/s (額定速率)
k=10^3M 10^3M=G 10^3G=T
項目１
- 帶寬：1頻域稱謂 2時域稱謂
- 信號具有的頻帶寬度 Hz kHz(赫 千 兆 吉)
- 帶寬用來表示網絡的通信線路傳送數據的能力，單位時間內從網絡一點到另一點的最高數據率 比特每秒 bit/s
- 在計算機領域 數據量單位 千 兆 吉代表的數值
- 計算機使用字節作爲度量單位，一字節（byte，B）8個比特
- 千用K表示2^10=1024 2^20=MB 2^30=GB
Gbit/s是數據傳送單位 1字節=8bit
1Gbit/s（0.125GB/s=128MB/s）
(MiB,MB是以2爲底數的指數)
(Mbit,Mb是以10爲底數的指數)
另附 十進制單位（SI） 二進制單位
kilo
The International System of Units (SI) defines the prefix kilo as 1000 (10^3); per this definition, one kilobyte is 1000 bytes.The internationally recommended unit symbol for the kilobyte is kB.
In historical usage in some areas of information technology, particularly in reference to digital memory capacity, kilobyte denotes 1024 (2^10) bytes. This arises from the powers-of-two sizing common to memory circuit design. In this context, the symbols K and KB are often used.
kibi
The kibibyte is a multiple of the unit byte for quantities of digital information. The binary prefix kibi means 2^10, or 1024; therefore, 1 kibibyte is 1024 bytes. The unit symbol for the kibibyte is KiB.
The unit was established by the International Electrotechnical Commission (IEC) in 1998,has been accepted for use by all major standards organizations, and is part of the International System of Quantities. The kibibyte was designed to replace the kilobyte in those computer science contexts in which the term kilobyte is used to mean 1024 bytes. The interpretation of the older term “kilobyte” to denote 1024 bytes, conflicting with the SI definition of the prefix kilo (1000), is still common.
- 十進制單位（SI）_______________________________________ 二進制單位
| 名字 | 縮寫 | 次方 | 名字 | 縮寫 | 次方 |
|---|---|---|---|---|---|
| kilobyte | KB | 10^3 | kibibyte | KiB | 2^10 |
| megabyte | MB | 10^6 | mebibyte | MiB | 2^20 |
| gigabyte | GB | 10^9 | gibibyte | GiB | 2^30 |
| terabyte | TB | 10^12 | tebibyte | TiB | 2^40 |
| petabyte | PB | 10^15 | pebibyte | PiB | 2^50 |
| exabyte | EB | 10^18 | exbibyte | EiB | 2^60 |
| zettabyte | ZB | 10^21 | zebibyte | ZiB | 2^70 |
| yottabyte | YB | 10^24 | yobibyte | YiB | 2^80 |