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Confusion between
bits and bytes
 When
are used they to transcribe a rate of transfer of data, the bits/bytes
are calculated in the traditional metric system
In the data transmissions,
a kilobit is a thousand of bits , or 1000 bits .
The bit is commonly
used to measure the quantity of data transferred in one second between
two points of transmission.
The Kilobit a
second is usually shortened in kbps or Kbps . Certain
sources define a kilobit as being 1024 bits . Although the
bit is the unit of the binary numerical system, the bits in the data communications
are discrete impulses of the signal and were historically counted by using
the decimal numerical system.
For example, 28.8
kilobits a second (kbps) represent 28 800 bits per seconds .
1 bit (b) = 0
or 1 = 1 binary digit
1 kilobit (kb)
= 10^3 bits = 1,000 bits
1 Megabit (Mb)
= 10^6 bits = 1,000,000 bits
1 Gigabit (Gb)
= 10^9 bits = 1,000,000,000 bits
When one use them to translate a size memory or of storage, a kilobyte
represents 2^10 or 1024 bytes . Because of binary architecture
of the computers and beaches of address memory, the bytes are always multiples
or exhibitors of 2.
1 byte (B) = 8
bits (b)
1 Kilobyte (K/KB)
= 2^10 bytes = 1,024 bytes
1 Megabyte (M/MB)
= 2^20 bytes = 1,048,576 bytes
1 Gigabyte (G/GB)
= 2^30 bytes = 1,073,741,824 bytes
1 Terabyte (T/TB)
= 2^40 bytes = 1,099,511,627,776 bytes
Although the storage
capacities of data, as on the hard disks, are generally expressed in MegaBytes
binary (2^20), the majority of manufacturing hard disks use the
decimal megabytes (10^6), which is appreciably different and generates
confusion...
1 byte (B) = 8
bits (b)
1 Kilobyte (K/KB)
= 10^3 bytes = 1,000 bytes
1 Megabyte (M/MB)
= 10^6 bytes = 1,000,000 bytes
1 Gigabyte (G/GB)
= 10^9 bytes = 1,000,000,000 bytes
1 Terabyte (T/TB)
= 10^12 bytes = 1,000,000,000,000 bytes
Count of the abbreviations
| bit |
b |
0 or 1 |
| byte |
B |
8 bits |
| kilobit |
kb |
1000 bits |
| kilobyte (binary) |
KB |
1024 bytes |
| kilobyte (decimal) |
KB |
1000 bytes |
| Megabit |
Mb |
1000 kilobits |
| Megabyte (binary) |
MB |
1024 Kilobytes |
| Megabyte (decimal) |
MB |
1000 Kilobytes |
| Gigabit |
Gb |
1000 Megabits |
| Gigabyte (binary) |
GB |
1024 Megabytes |
| Gigabyte (decimal) |
GB |
1000 Megabytes |
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Table of reference of the
band-widths
|
| Name
of the circuit |
Capacity |
Comment |
| DS0 |
64 kbps |
Portion of T1 |
| ISDN |
64 kbps/128 kbps |
1 or 2 cx |
| Frame Relay (Fractional
T1) |
64 kbps/1.54 Mbps |
North America |
| T1, DS-1 |
1.544 Mbps |
North America |
| E1, DS-1 |
2.048 Mbps |
Europe, Asia |
| T2, DS-2 |
6.312 Mbps |
America of North |
| E2 |
8.448 Mbps |
Europe |
| E3 |
34.368 Mbps |
Europe and Japan |
| T3 or DS3 |
44.736 Mbps |
672 DS0, 28 T1 |
| OC-1, STS1 |
51.840 Mbps |
Optical fibre, switch ATM,
SONET |
| Fast Ethernet |
100.00 Mbps |
bandage fréquance
without wire |
| OC-3, STS3 |
155.520 Mbps |
Optical fibre; 3 X 51.840Mbps |
| OC-3c |
155.520 Mbps |
Optical fibre; "C" = concatené |
| T4 |
274 Mbps |
equivalent of 6 T3' S |
| OC-12, STS12 |
622.080 Mbps |
Optical fibre, switch ATM,
SONET |
| OC-48 |
2.488 Gbps |
Optical fibre, switch ATM
*, SONET |
| OC-96 |
4.976 Gbps |
Optical fibre, switches
ATM *, SONET |
| OC-192 |
10 Gbps |
Optical fibre, switches
ATM *, SONET |
| OC-255 |
13.21 Gbps |
Optical fibre, switches
ATM *, SONET |
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