How is network bandwidth calculated? How is the bandwidth formula calculated

In computer networks and IDC rooms, the unit of network transmission rate is expressed in b s (bits per second) (or bit s, sometimes written as bps, that is, bit per second).

In the field of communications and computers, special attention should be paid to the numerical values represented by the abbreviations of the units of quantity, such as "kilo", "mega", "giga", etc. The unit of quantity in a computer is measured in bytes, and the "thousand" of "kilobyte" is represented by a capital k, which is equal to 210, which is 1024, not 1000.

In the actual network application, the software often sees the speed displayed as 176kb s, 103kb s and other broadband speed sizes, because the unit of line bandwidth provided by the ISP is bit, and the general software displays bytes (bytes) (1byte=8bit), so the actual value can be obtained through conversion. Let's take 1M broadband as an example and convert it according to the conversion formula:

1mb/s=1024*1024b/s=1024kb/s=1024/8kb/s=128kb/s

Theoretically: the theoretical rate of 2M (i.e. 2MB s) broadband is: 256KBS, and the actual rate is about 150 240KBS; (The reason is caused by the user's computer performance, network equipment quality, resource usage, network peak period, service capacity, line attenuation, signal attenuation and other factors).

The theoretical rate of 4M (i.e. 4MB s) broadband is 512 kbs, and the actual rate is about 200 440 kbs. The uplink rate refers to the data transmission rate when the user's computer sends information to the network, and the downlink rate refers to the transmission rate when the network sends information to the user's computer.

For example, if you use FTP to upload a file to the Internet, the upload speed will affect the "uplink rate". And from the ** file on the Internet, what affects the ** speed is the "downlink rate". Of course, in the actual transmission process, the quality of the line, equipment (including computers and other equipment) will also have a greater or less impact on the speed.

This refers to the unit calculation method and relationship of bandwidth network speed.

In computer networks and IDC rooms, the unit of broadband rate is expressed in bps (or b s); The conversion relationship is as follows: 1 byte = 8 bits

1b=8b --1bs=8bs (or 1bps=8bps).

1kb=1024b --1kb/s=1024b/s

1mb=1024kb --1mb/s=1024kb/s

In the actual network application, the software often sees the speed displayed as 128kb (kb s), 103kb s and other broadband rate sizes, because the line bandwidth provided by the ISP is used in bits, and the general software displays bytes (1 byte 8 bits), so the actual value can be obtained through conversion. However, we can follow the conversion formula to convert it:

128KB S=128 8(KBs)=1024KBs=1MB S, that is: 128KBs=1MB S

Theoretically: the theoretical rate of 2M (i.e. 2Mb s) broadband is: 256kb s (i.e., 2048kb s), and the actual rate is about 80-200kb s; (The reason is caused by the user's computer performance, network equipment quality, resource usage, network peak period, service capacity, line attenuation, signal attenuation and other factors).

The theoretical rate of 4M (i.e. 4MB s) broadband is 512 kbs, and the actual rate is about 200 440 kbs.

In the actual network application, the software often sees such as the speed display of 125kb (kb s), 103kb s and so on broadband rate size words, because the line bandwidth provided by the ISP uses the unit of bits, and the general software displays bytes (1 byte = 8 bits), so it is necessary to convert to get the actual value. Let's take 1M broadband as an example and convert it according to the conversion formula:

1mb/s≈1000kb/s≈1000/8kb/s≈125kb/s

The maximum speed of wired broadband Internet access with a bandwidth of 1m is 1024kbps, but the ** rate displayed by the general software is generally about 100kbytes s, which is far from the "1024" applied by the customer.

In fact, the "1024" in this is not the same as the 100kbytes s unit.

The full name of 1024kbps is 1024kbits s, that is, the unit is a bit, and the unit of 100kbytes s is a byte, and a byte is equal to 8 bits, so that 1024kbits s = 128kbytes s. The bandwidth of wired broadband is converted to 1 Mbps = 1024 8 (kbps) = 128kbps, which is 128kbyte s

Telecom gives us the unit of MBIT, and when we actually apply it, it is calculated in MBITY, 1BITY = 8bit

Calculation method: In computer networks and IDC rooms, the unit of network transmission rate is expressed in b s (bits per second) (or bit s, sometimes written as bps, that is, bit per second).

In the field of communication and computing, special attention should be paid to the numerical values represented by the abbreviations of the units of quantity, such as "kilo", "mega", "giga", etc. The unit of quantity in a computer is measured in bytes, and the "thousand" of "kilobyte" is represented by a capital k, which is equal to 210, which is 1024, not 1000.

In the actual network application, the software often sees the speed of the software as 176kb s, 103kb s and other broadband speed sizes, because the line bandwidth provided by the ISP is used in bits.

The general ** software displays bytes (bytes) (1byte=8bit), so the actual value can only be obtained through conversion. Let's take 1M broadband as an example and convert it according to the conversion formula:

1mb/s=1000kb/s=1000000b/s=1000000/8 b/s=125000b/s=125000/1024 kb/s=

One is the bit bit bit, and the other is the byte byte. Usually there are 8 bits in 1 byte. Network bandwidthIt is usually used as bps (nominal bit s).Unit of measure, i.e. "bits-per-second, which is often translated asBaud rate.

Note: At present, most IDC computer rooms provide the bandwidth metering method: Mbps, which is actually the port call or traffic of the switch, not the actual bandwidth of each server, usually the total bandwidth of a cabinet is about:

10 30 Mbps, the so-called 100 megabit sharing is actually sharing 100 megabit ports, not sharing 100 megabit bandwidth.

In the field of communications and in the field of computers.

Particular attention should be paid to the units of quantity.

The numerical value represented by the abbreviations of "thousand", "mega", "auspicious", etc. The unit of quantity in a computer is measured in bytes, and the "thousand" of "kilobyte" is represented by a capital k, which is equal to 210, which is 1024, not 1000.

In the actual network application, the software often sees the speed displayed as 176kb s, 103kb s and other broadband speed sizes, because the unit of line bandwidth provided by the ISP is bit, and the general software displays bytes (bytes) (1byte=8bit), so the actual value can be obtained through conversion.

The above content is referred to: Encyclopedia - Network Bandwidth.