# The solution of slow speed

Source: Internet
Author: User

Telecom, Netcom has provided users with a number of different grades of speed can be selected.

The average household has 1M. 2M also has the speed 8M. I use the telecommunication adsl2m, the daily expense is 2 yuan money. Speed can also be, with BT download, generally in the 210K or so.

A little knowledge of broadband speed

Basic knowledge:

(1) A description of the conversion of bit (bit)/second (seconds) and byte (bytes)/s (sec): The line unit is BPS, which indicates bit (bit)/second (seconds), note is lowercase b; The rate units that users display when downloading online are often byte (bytes)/s (sec ), note that the capital letter B. The relationship between byte and bit is 1byte=8bits, and the actual transmission rate is about 10kbps when the transmission rate of IP header, HTTP header and so on is increased by network transmission protocol, and the 1kbyte/s download speed is displayed. For example: The download display is 50kbyte/s, the actual has reached the speed of 500Kbps. Remember to pay attention to unit!!!

(2) The broadband service rate that the user applies refers to the maximum theoretical rate value that can be reached by the technology, the user is also affected by the user's computer hardware and software configuration, the location of the website, the bandwidth of the website, etc.

(3) Theoretically: 2M (ie 2mb/s) broadband theoretical rate is: 256kb/s (ie 2048kb/s), the actual rate is approximately 103--200kb/s; (the reason is the user's computer performance, network equipment quality, Resource usage, network Peak, Web service capacity, line loss, The effect of multiple factors such as signal attenuation). The broadband theoretical rate of 4M (i.e. 4mb/s) is: 512kb/s, the actual rate is approximately---440kb/s.

Calculation method of broadband network speed

In computer science, bit is the smallest unit of information, called bits, which is usually expressed in 0 and 1. Byte is called Byte and consists of 8 bits (8bit) of a byte (1Byte) that represents a character in the computer. Bit and byte can be converted between, the conversion relationship is: 1byte=8bit (or abbreviated as: 1b=8b), in the practical application of the general abbreviation, that is, 1bit abbreviated to 1b (note is the lowercase letter b), 1Byte abbreviation for 1B (note that the capital letter B).

In computer networks or network operators, in general, the unit of broadband rate is expressed in bps (or b/s), and bps represents bits per second, which represents the number of bits per second, and is the abbreviation for bit second. In practice, the 1M bandwidth means 1Mbps (Mbps is megabits per second without megabytes per second Mbps).

It is recommended that users remember the following conversion formulas:

1b=8b 1b/s=8b/s (or 1bps=8bps)

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

1MB=1024KB 1mb/s=1024kb/s

Spec hint: In the actual writing specification B should represent Byte (byte), B should represent bit (bit), but in peacetime actual writing some of the bit and byte mixed to B, such as both MB/s and MB/s are mixed to MB/s, resulting in the actual calculation of the confusion of the unit error. Remember to pay attention to!!!

Example: In our actual Web application, downloading software often see the words such as the download speed shown as 128KBps (kb/s), 103kb/s, and so on broadband rate size, because the ISP provides the line bandwidth used by the unit is bit, while the general download software shows the byte (1 bytes =8 bit), So you can get the actual value by conversion. However, we can use the conversion formula to convert the following:

128kb/s=128x8 (kb/s) =1024kb/s=1mb/s is 128kb/s=1mb/s.

A user reflects, why my speed and I do not have the same bandwidth? Why do I test but only 200 K network speed AH?

Analysis: Respected users, this is just a misunderstanding. There may be several reasons why you don't understand: first, the actual speed of the unit is MB/s, not MB/s, and you say more than 200 k, which actually refers to more than 200 kb/s (that is, more than 200 kilobytes per second) is not more than 200 kb/s (that is, 2百多千 bits per second), usually referred to as 250kb/ s or 250kb/s is said to be 250K. Second, broadband 4mb/s=512kb/s and this is only the largest theoretical value of the technology, rather than the actual value achieved, the general normal conditions of the maximum theoretical value of 4mb/s broadband real value can reach 200kb/s to 440kb/s. Because the broadband rate is subject to a number of factors (such as user computer performance, resource usage, network Peak, Web service capacity, signal loss, line loss, distance, etc.), so that the actual value and the technical maximum theoretical value is biased. Third, in the broadband rate unit provided by the network operator, "bps" means "bit per second". and the actual speed refers to the bps refers to "Byte per second". So to pass the conversion, and 1byte=8bit, in the calculation of the uplink speed or downlink speed, you must divide the number by 8 to convert the bit to byte. For example: downlink speed (that is, download speed) for 1mb/s, its conversion into equal value is 128KBps; Conversion method: 1mbps=1024/8 (KBps) =128kbps is 128kbyte/s.

A user reflects, I do the broadband, why my network speed than usually slow yo, but also often drop the line? Did telecom cheat me?

Analysis: leads to slow speed and frequent drop of line, there are usually several possible causes: first, the computer virus infection is more serious; second: computer software and hardware configuration and performance; third, the quality of Internet terminals, network cable quality, transmission line load; Four, the line contact is good, the power supply voltage is stable and so on; External signal interference, signal attenuation, line decay and length of line distance; vi, private or irregular network; seven, the network card quality is not good or not plugged in; eighth, the installation of a variety of anti-virus software and firewalls or run too many programs at the same time, Nineth, communication protocol settings and firewall configuration, and so on; for this case, The user's situation was identified, the user's network slow and offline reasons are: First, the user's computer infected with a variety of viruses, resulting in memory consumption, CPU utilization rate is high, often up to 100%, affecting the performance of the computer, resulting in slow speed; second, the user for ADSL dial-up Internet access, because of irregular network, Causes the line transmission load to aggravate, affects the line transmission flow, causes the network speed to be slow and often loses the line. Third, the network cable RJ45 and hub of the joint contact is not good and power supply voltage instability.

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