popular expression of BPON, GPON and EPON difference
Liu Xi
--- Five people from the blog
I am a little
PON, when I came to this world, I was emerging as a new thing. Many people like me, some people does not like me. Now I have slowly grown up. However, there are many things I do not understand. I do not know why everyone calls me PON, my parents are? Where are they? I do not know what I have brothers and sisters? I do not even know why my appearance, I do not know where to go? I do not know, I looked like? I walk the streets alone destination, walked, this time in front of a Hefatongyan elderly walking towards me and told me: \\? ... was thinking, I have many questions to ask the old man, looked up, how was gone. I went hunting, did not see what that elderly people. only his words still remain in my ear, the last mile village? have nothing else to do, I try to find out the last mile to the way how to get the village. Along the way met a lot of people,
ecco boots, they all told me the same sentence, that this matter is important, I have to do it. on the way met two called WAN (backbone network) and MAN (metropolitan area) and good-hearted people, they took me to the entrance of the village of the last mile (access network). the whole village, a lively scene.
Slowly I got to know people with the village.
I want to tell you that this village has three children and I are very similar names, belonging to two families, and their parents in the village who are very authoritative. APON and GPON are brothers, APON 10 years old this year (1995 students), some said he was 7 years old, GPON 4 years old, their father called the ITU-T , the mother called the FSAN (Full Service Access Network). GPON born in the year (2001), their parents changed the name to APON BPON was. There is another called EPON, he was born in 2000, 5 years old this year, EPON's father called the IEEE, the mother called EFM (Ethernet in the First Mile), EPON close relationship with a man named Ethernet, and Ethernet in the village and a wide sphere of influence outside the village, so, EPON and therefore very popular. GPON Although the youngest, but his birth village, many people entrusted this desire. BPON, EPON, and GPON their greatest feature is that they all have a unique approach to helping the people of the village with the outside world exchange information. precisely because of their expertise in this, the last mile village, exchange of information between people in the future to rely on them.
Although the ITU-T, FSAN, IEEE, is an authority here, but then they have a study with a teacher's experience. FSAN master the most, about 50, including Verizon, Bellsouth, BT, France Telecom, Korea Telecom; Agere; OKI; Flexlight; Fujitsu; Hitachi; Infineon; Intel, and so well-known high people.
topic back to my brothers and friends of three of the same name. Gradually, the last mile village people have a message to the world outside the village to communicate, through B, E, GPON . This 3PON have a child prodigy of the supernatural. but they will be sent to the village head and what each needs to first build a call OLT (this is a capable big stuff) place, from there go any further. PON brothers also Each prepared a very convenient one box, take the name of ONU. each as long as news to the outside communication, where only the information on the ONU, PON is very often they will be responsible for regularly in order to collect. slowly, small PON PON brothers will find a certain number (16/32/64/128) and collected a ONU things inside the box with a dedicated pipeline (known as Fiber) sent to a collection point where the OLT, and then unified by the OLT certain rules to send to a pipe outside the village. Of course this is a two-way transmission, outside information can also be spread through the network by the OLT for each ONU. PON brothers placed in the middle of the device of a Passive optical Splitter responsible for the distribution and collection. This is a method of their transfer process is characterized by the middle of this Passive optical Splitter (passive optical splitter), such an OLT can be responsible for lots of ONU (multipoint), saving the OLT also save the pipeline Fiber, and if every one of the ONU, pipelines directly connected to the OLT, then you need lots of OLT (same number) (point to point). More importantly, Passiveoptical Splitter does not require energy supply.
Later, small PON slowly realized it, B, E, GPON's ability comes from their parents FSAN, ITU-T, IEEE, etc., where words and deeds come. FSAN, ITU-T, IEEE will continue to Tips to some of their children. These secrets have code, ITU-T BPON the secrets to the code-named G. 983; to GPON, secrets code is: G. 984; IEEE to EPON, is: 802.3ah . and these secrets in due time there will be new versions.
above B, G, EPON read the secrets of three there is a difference. BPON not change the name used to be called APON, APON Back then it was famous inherited the mantle of ATM, but the so-called highbrow, ATM's \allowed to adapt to more situations, renamed BPON, BPON the demand for more people, the same system can do more. At this point, EPON is the use of its profile in the last mile village has its sphere of influence the Ethernet, so his presence was the most consistent and the status quo. But, there are a wise man said that now meet the compliance does not equal the future, people's demand for more, EPON to meet the various needs of the new rules not yet published. that rainy day, GPON is the future of this area see, in a more rapid and more efficient (to meet the various needs, to adapt to a variety of business) important aspects to consider, as G.984, which is a lot of people support the application of the participants.
; GPON, EPON, BPON Cheats concentrate on the three brothers took the practice, with small, but ambitious, is to become the last mile of the village leader, pushed out of the other brothers. fighting is the most powerful both GPON and EPON brothers, despise each other, often on another cursed, accused each other. BPON it, the oldest, but more honest. GPON and EPON brothers, did not it looked down on, because the main skill is to practice BPON can receive both ATM.ATM voice, data, IP, and video services,
discount ecco shoes, is a very good effort. But when the transfer IP data, ATM a bit too careful, so efficiency is too low. IP in the village to know the hearts of the people has become increasingly important position , have set the rules, who can not better to send IP, who will be eliminated. but it is also more money to use ATM, so do not be optimistic about the future. But then, due to relatively practical BPON honest, though not outstanding, but more comprehensive , so now most people in the village or BPON.BPON also greatly rely on encouragement, would have its maximum downstream speed is 622Mb / s, now ITU-T in his father's encouragement, the maximum speed of aiming to 125> Gb / s, want better for the people, do not lag behind other brothers.
GPON and EPON is somewhat incompatible mean, after all, is not born of the same parents. GPON it, self origin is superior and omnipotence. GPON let us look at the effort it. The greatest secret is that it draws on the lessons of his brother BPON. it dry with ATM access, while living, and gave himself secretly added another one effort, called the GEM (GPON psulationMethod). GPON basically put their bet on the future of all the GEM bodies. It is intended to embrace all future business to do all in GEM. GEM what stuff do? you heard the more popular protocols SDH Generic Framing Protocol GFP bar, GEM is it is a variant of GFP, was GPON slightly modified a bit to get back to use. think about SDH and TDM voice services in undertaking the ability to know the GEM in how much access the advantages of voice services, the efficiency and performance is very good. GEM can also use very high efficiency through Ethernet to encapsulate IP data package. This is where it triumphantly, but also transfer of voice, can pass data, but also can maintain high efficiency,
ecco casual, these brothers, how can I beat that PON. that was not, GPON also decided to physically than the other brothers, all indicators are No.1, for example, the maximum downlink rate Support can support 2.5Gbps, upstream rate can be flexible allocation of breath also hope I can run 40km, support 64 ONU. Of course, Tell me what you want to note that this is the ideal GPON, and if he is to this end, more charges, then they can be difficult to go for the villagers. look, GPON is pretty good, but sometimes GPON also trying to sell the trick is hanging GEM (or GFP) to sell ATM mean. This is why , GPON has ATM and GEM supports two protocols, ATM was originally used to support the existing ATM service interface, but the GEM has not yet developed, so GPON sometimes pushed to the ATM data services took him to do, to do so ,
ecco sale, GPON nothing compared to the superiority of the BPON. But people of the village is not so easy to see that trick the GPON, GPON connivance of its fans, it's so true or otherwise Lanhuo dry, but please believe GPON are intended to be a very good.
say EPON. EPON in perspective a bit like a BPON, is a muscle, BPON want to use ATM to do all live, EPON as with Ethernet (Ethernet ) to contract all services. However, Ethernet and IP relations are very good, so the villagers that EPON is very promising, much different from the ATM.EPON also greatly moved by this, met with villagers to Kiss, KISS principle advocated to attract the villagers. KISS rule is Keep It Simple and Stupid.EPON believe that all future business, whether it is voice, video, or data, will be IP to host. so do the PON earners will simply not necessary to like GPON so hard effort. so that everyone is curious to think, EPON transmission is of unique IP, but how to pass voice this time business? Ethernet network that already in our approach, this is classified as circuit emulation service (Circuit Emulation Service , CES) to send. pass the video it, the way we should do with IPTV. All solutions are with the Ethernet / IP to resolve. As for how the performance would depend on the villagers Ethernent / IP have much confidence . Not all the villagers are very confident, and my heart whispered: I called when the neighbors will play a network game because of a sudden, or the next file, put my phone to interrupt it. Therefore, the EPON management, QOS issues need to give the villagers the confidence ah. EPON of the very significant advantage is that the device requires low, and is a unified Ethernet platform, and the management is also simple and costs low. Therefore, EPON approachable, costs low. However, EPON GPON, the fans can be fans no less able to speak. EPON has a ugly face that is on their rates. EPON downstream surface of wire-speed rate is 1.25Gbps, but on the basis of the device in order to reduce requirements, it adopted a 8B/10B encoding, together with other expenses, the cost of this approachable, to make it in the actual data transfer rate of about 600-700Mbps. This, GPON blow that their efficiency is high, sit there straight fingers Suanlaisuanqu do not know how to even out prices than their actual service EPON is low, so he started to laugh when the EPON: So you are Expensive PON ah. This is, GPON's earliest fans called flexlight and the most exaggerated, each critical one every few days to EPON, wait for them to drown with saliva to EPON. However, GPON platform complexity introduced by the second floor of the difficulty and cost management, GPON on the IP approach, are very difficult to look at that clear, Members of the clamor of the GPON also feel suspicious. villagers will not therefore to cold EPON, but always concerned about the EPON and GPON growth of the two brothers. The so-called, distance tests a horse in a long fat (PON) hearts!
actually owned by three brothers slapstick slapstick, they have in common. For example, the core of their technology compared to other fiber optic device family, brother, will be special. For example, in the passive device they need single fiber bi-directional device, BIDI, so that the downlink signal generally use 1490nm wavelength, with 1310 uplink signal wavelength, single fiber to achieve the purpose of sending signals in both directions. In active devices, there to receive and fired a burst requirements.
ONU to OLT because of different signal to go the distance are different, so OLT received signal changes in the magnitude and timing is very large, so the ONU and OLT receiver needs to launch respond more quickly. so the corresponding chip being developed is also difficult. However, EPON and GPON two brothers some of the automatic brain. EPON uses 8B/10B encoding to reduce the recovery time of difficulty. and GPON does require ONU capable of power control, as far as possible by OLT the signal amplitude do not change so much, but also lowers the requirements of the underlying device.
PON three brothers and a common magic, that is, 'video overlay' (video overlay) technology. This is supported by video a convenient technology transfer. is down the line, plus a 1555nm wavelength of light, the digital or analog video information directly through the RF modulation added to the light on. Thus, a large capacity capable of delivering video signals on the network changes are very small, very convenient. Once they use this magic, people of the village to call them uniform VPON (videoPON) a. due to the distinction between the three wavelengths, in which case, PON brothers need to one-way three- device technology to support the (optical triplexer). Infineon's fans as one of PON, to do a good job in this area. Of course, the people of the village into the IP TV will eventually want to upload, as long as the TV via mpeg2 to IP technology, PON brothers on the use of ATM, Ethernet protocols to support, send so-called IPTV, this time, need to recount the three brothers.
they are facing an enemy that is DSL family. DSL family members of many, there ADSL, ADSL2, VDSL and so a bunch of brothers. They rely on fiber to eat is different from the PON family, their guy is the phone line to make a living. PON family first looked down on DSL because they sluggish. as ADSL downlink Only 1M-2Mb / s, upstream rate is even lower. However, contrary to their surprise by the DSL people of the village was widely welcomed, PON has been ignored. DSL family, although the deficiencies, it is generally easy to learn, like VDSL can go to the 6M-8Mbps and more to make up deficiencies. and which support voice and data services is sufficient. This is the main reason for suppression of PON.
PON fantasy video market was booming then one day, by to defeat their own broadband DSL. because even with mpeg2 compression, a TV channel to account for at least 2Mbps bandwidth, DSL is less emboldened enough to. However,
ecco shoes store, DSL low-cost, as well as ADSL2, VDSL, etc. to join, IPTV business conduct beginning or by the DSL family. PON had to become a rear base, and sometimes also supports video information to be added directly through the modulation of light waves on the radio. In this way, can transmit a large volume of video signals,
ecco shoes online, the network changes are very small, very convenient. Once they use this magic, people of the village to a unified call them VPON (videoPON) a. due to the distinction between the three wavelengths, in which case, PON need to check the three brothers to the device technology to support the (optical triplexer ). Infineon's fans as one of PON, to do a good job in this area. Of course, the people of the village into the IP TV will eventually want to upload, as long as the TV through the mpeg2 to the IP based, PON brothers on the use of ATM , Ethernet protocols to support, send so-called IPTV, this time, need to recount the three brothers.
facing an enemy who is DSL family. DSL family members of many, there ADSL, ADSL2 , VDSL and so a bunch of brothers. They rely on fiber to eat is different from the PON family, their guy is the phone line to make a living. PON family first looked down on DSL because they sluggish. as ADSL downlink rate is only 1M-2Mb / s, uplink even lower. However, contrary to their surprise by the DSL people of the village was widely welcomed, PON has been ignored. DSL family, although the deficiencies, it is generally easy to learn, like VDSL can go to the 6M-8Mbps and more, to make up insufficient. And this voice and data services support has been sufficient. This is the main reason for suppression of PON.
PON fantasy video market was booming then one day, on their own to defeat broadband DSL. because even if use mpeg2 compression, a TV channel to account for at least 2Mbps bandwidth, DSL is less emboldened enough to. However, DSL low-cost, and ADSL2, VDSL, etc. to join, IPTV started the business in the family or by DSL. PON had to do rear, and sometimes also supports about DSL, PON it is not thought of.
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