ADSL Question 2
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Users questions:Just forgot to ask, I can go to the bureau to change my speeds, I now change the 2M, and we changed it was 10M, and may his speeds faster I do not know in the end did not, I see some people that the highest 8M, then you suggested that I change over wide best? If I could change in the bureau and then to my home phoneLine replaced by shielded cable, speed will be increased? After I finished dialing, the following shows 100Mbps, which in the end mean?
Experts answer: ADSL speed upgrade three tactics first move: to know ourselves and wants to solve the problem, we must first know ourselves. Let's look at ADSLADSL works do not need to set up the biggest advantage is that private network, it can exploit the world's most widely distributed copper as the transmission medium of telephone and in a pair of copper twisted pair (telephone line) get three messages Channel: A channel for the standard telephone service, a rate of 640kbps~ 1Mbps medium-speed upstream channel, a rate of 1Mbps ~ 8Mbps high-speed downlink channel, and these three channels can work simultaneously. DMT modulation and demodulation techniques in a pair of copper telephone line 0 ~ 4kHz frequency band used to transmit telephone audio with 26kHz ~ 1.1MHz-band data transmission, and put it to 4KHz the width of the uplink sub-divided into 25 channels and 249 downstream sub-channels. Input data through the bit allocation and buffer into the bit block, and then modulated by the TCM coded QAMM send sub-channel, in theory, can transfer 15bits of data per Hertz,Therefore, the theoretical ADSL line speed 25 4 15 = 1.5Mbps, while the theoretical downlink speed of 249 415 = 14.9Mbps (Of course, this is only a theoretical peak, the actual transmission because of line quality and distance factor is difficult to achieve such a high-speed). ADSL speed and stability of a relationship in fact the main and two, one for your ADSL to the bureau's central office equipment (ADSL module engine room) of the distance from the more distant, slower and unstable. Second, the quality of good or bad phone line itself, the size of electromagnetic interference. Third, of course, the reasons for our own equipmentThe. Along this vein, we try to solve the problem about it. The second measure: transform circuit is now widely used telephone lines, originally designed for voice communications, the bandwidth of about 300Hz to 3300Hz are basically not consider the data communications needs. In a network, the communication signals of highSome have a certain frequency attenuation, especially when the aging narrower bandwidth, attenuation is more severe - on ADSL, this is the most deadly. As the ADSL technology requires high quality of telephone lines, and is currently used in ADSL is a RADSL (ie rate adaptive ADSL), ifModule Board to the user between telephone lines in a certain period of time, interference by external factors, RADSL dynamically adjust the user's access speed. ADSL is a technology based on twisted pair, twisted pair is two insulated copper wires wrapped around each other with some regularity and together, this can effectively resist externalElectromagnetic interference. Households is over 20 meters parallel to the user, should be replaced first twisted pair of parallel lines, preferably brand Category 5. Change line in time to note the strength of twisted pair is not enough, we must try to fixed, or you planted a lot of hidden dangers. Replaced after not feeling faster Internet accessMany? Here to tell you a secret, the bureau could have been the sub-junction box cable twisted pair, but in order to reduce costs, the bureau usually regarded phone line to line connection. This is the original of course use the telephone when the impact is small, but in the next most sensitive of ADSL line after it became a bottleNeck! Aware of this problem, you must let them change the route twisted pair wiring, eliminating the bottleneck, it will greatly improve the speed of the Internet. For complete outside, into the interior, but also pay attention to the following questions: 1, because ADSL is a low-frequency voice of ordinary telephone lines superimposed on high-frequency digital signal, theTo filter from the bureau to the ADSL connection to any equipment this will be harmful to join the normal transmission of data, so do not filter before and telephone, phone anti-theft devices and other equipment to fight. Although theoretically ADSL telephone line connection speed will not have any impact on the Internet, but when received the unqualifiedEquipment, the speed will slow down even on the Internet. I proposed, conditional, it is best to install an ADSL line, this can avoid some strange problems. Money? Do not worry, initial installation fee is not canceled yet? :) 2, indoor wiring problem. Special attention must not be peace and power lines running
Experts answer: ADSL speed upgrade three tactics first move: to know ourselves and wants to solve the problem, we must first know ourselves. Let's look at ADSLADSL works do not need to set up the biggest advantage is that private network, it can exploit the world's most widely distributed copper as the transmission medium of telephone and in a pair of copper twisted pair (telephone line) get three messages Channel: A channel for the standard telephone service, a rate of 640kbps~ 1Mbps medium-speed upstream channel, a rate of 1Mbps ~ 8Mbps high-speed downlink channel, and these three channels can work simultaneously. DMT modulation and demodulation techniques in a pair of copper telephone line 0 ~ 4kHz frequency band used to transmit telephone audio with 26kHz ~ 1.1MHz-band data transmission, and put it to 4KHz the width of the uplink sub-divided into 25 channels and 249 downstream sub-channels. Input data through the bit allocation and buffer into the bit block, and then modulated by the TCM coded QAMM send sub-channel, in theory, can transfer 15bits of data per Hertz,Therefore, the theoretical ADSL line speed 25 4 15 = 1.5Mbps, while the theoretical downlink speed of 249 415 = 14.9Mbps (Of course, this is only a theoretical peak, the actual transmission because of line quality and distance factor is difficult to achieve such a high-speed). ADSL speed and stability of a relationship in fact the main and two, one for your ADSL to the bureau's central office equipment (ADSL module engine room) of the distance from the more distant, slower and unstable. Second, the quality of good or bad phone line itself, the size of electromagnetic interference. Third, of course, the reasons for our own equipmentThe. Along this vein, we try to solve the problem about it. The second measure: transform circuit is now widely used telephone lines, originally designed for voice communications, the bandwidth of about 300Hz to 3300Hz are basically not consider the data communications needs. In a network, the communication signals of highSome have a certain frequency attenuation, especially when the aging narrower bandwidth, attenuation is more severe - on ADSL, this is the most deadly. As the ADSL technology requires high quality of telephone lines, and is currently used in ADSL is a RADSL (ie rate adaptive ADSL), ifModule Board to the user between telephone lines in a certain period of time, interference by external factors, RADSL dynamically adjust the user's access speed. ADSL is a technology based on twisted pair, twisted pair is two insulated copper wires wrapped around each other with some regularity and together, this can effectively resist externalElectromagnetic interference. Households is over 20 meters parallel to the user, should be replaced first twisted pair of parallel lines, preferably brand Category 5. Change line in time to note the strength of twisted pair is not enough, we must try to fixed, or you planted a lot of hidden dangers. Replaced after not feeling faster Internet accessMany? Here to tell you a secret, the bureau could have been the sub-junction box cable twisted pair, but in order to reduce costs, the bureau usually regarded phone line to line connection. This is the original of course use the telephone when the impact is small, but in the next most sensitive of ADSL line after it became a bottleNeck! Aware of this problem, you must let them change the route twisted pair wiring, eliminating the bottleneck, it will greatly improve the speed of the Internet. For complete outside, into the interior, but also pay attention to the following questions: 1, because ADSL is a low-frequency voice of ordinary telephone lines superimposed on high-frequency digital signal, theTo filter from the bureau to the ADSL connection to any equipment this will be harmful to join the normal transmission of data, so do not filter before and telephone, phone anti-theft devices and other equipment to fight. Although theoretically ADSL telephone line connection speed will not have any impact on the Internet, but when received the unqualifiedEquipment, the speed will slow down even on the Internet. I proposed, conditional, it is best to install an ADSL line, this can avoid some strange problems. Money? Do not worry, initial installation fee is not canceled yet? :) 2, indoor wiring problem. Special attention must not be peace and power lines running
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