Difference Between BPON, GPON and EPON

Hello,

Today I will share with you the difference between BPON, GPON and EPON in a popular way.

GPON and EPON are somewhat incompatible. After all, they are not born to the same parents. As for GPON, I feel that I have a superior background and can do everything. Let us first look at the effort of GPON. Its biggest secret is that it has learned the lessons of its brother BPON. It is using ATM to connect to the live PON, so it dreams of a day when the video service is prosperous, relying on its own broadband to defeat DSL. Because even with mpeg2 compression, a TV channel needs to occupy at least 2Mbps of bandwidth, DSL is not so emboldened. However, DSL charges are low, with the addition of ADSL2, VDSL, etc., and the start of IPTV services development depends on the DSL family. PON had to make the rear bigger, and sometimes it also supports pseudo-video information directly added to the light wave through radio frequency modulation. In this way, a large capacity of video signals can be transmitted, and network changes are also small, which is very convenient. Once they use this magic weapon, the people in the village will call them VPON (video PON). Due to the need to distinguish three wavelengths, in this case, the PON brothers need one-way three-way device technology to support (optical triplexer). As one of the fans of PON, Infineon does a good job in this regard. Of course, the people in the village ultimately want to upload TV to IP. As long as the TV is converted to IP through mpeg2, the PON brothers will use ATM and Ethernet protocol to support the transmission of the so-called IPTV. At this time, the three brothers need Each shows its magical powers.

At the same time, he also secretly added another skill to himself, called GEM (GPON pulsation Method). GPON basically bet all its future on GEM. It intends to use GEM to do all the services it can obtain. What is GEM? Everyone has heard of the popular framing protocol GFP in SDH. GEM is a variant of GFP, which has been slightly modified by GPON and used. Think about SDH’s ability to undertake voice and TDM services, and you will know how superior GEM is in accessing voice services, with very good efficiency and performance. GEM can also encapsulate IP data by encapsulating ether with very high efficiency. This is where it prides itself. It can transmit voice and data, and still maintain high efficiency. How can these PON brothers compare to it. That’s not to say, GPON decided to surpass other brothers in physical strength, and it is No. 1 in various indicators. For example, the maximum downlink rate support can support 2.5Gbps, and the uplink rate can be flexibly allocated. It also hopes that it can run in one breath. 40km, supports 64 ONUs. Of course, everyone should pay attention to it. This is the ideal of GPON. If he charges more for this, it will be difficult for the villagers to buy it. It seems that GPON is really good, but sometimes GPON also has a trick of selling dog meat, which means selling ATM with GEM (or GFP). Why is this? GPON supports both ATM and GEM protocols. ATM was originally used to support the original ATM service interface, but GEM has not matured yet, so GPON sometimes pushes data services to ATM. In doing so, GPON has no advantage over BPON. However, it is not so easy for the people in the village to see GPON’s tricks. With the connivance of its fans, GPON is doing the real and the fake. But please believe that GPON’s original intention is very good. List several GPON network devices for your reference. OLT: MA5608T/MA5683T, ONT: EG8141A5/HG8247H5.

Let’s talk about EPON. EPON is a bit like BPON from a certain angle, it is just a rib. BPON wants to use ATM to do all the work, and EPON is like Ethernet to undertake all services. However, the relationship between Ethernet and IP is very good, so the villagers I think that EPON is also very promising, which is very different from ATM. EPON was also moved by this, and when I met the villagers, I kissed and strongly advocated the KISS rule to attract the villagers. The KISS rule is Keep It Simple and Stupid. EPON firmly believes that all future services, whether it is voice, video, or data, will be carried by IP. Therefore, it is necessary to be simple and simple to be a PON boy, and there is no need to work hard like GPON. So everyone is curious to think that EPON is naturally blessed to transmit IP, but how to transmit the timing service of voice? This has long been dealt with in the Ethernet network, and it is classified as Circuit Emulation Service (CES). To transmit video, it is necessary to use IPTV. All solutions are solved by Ethernet/IP. As for the performance, it depends on how much confidence the villagers have in Ethernet/IP. Not all villagers are very confident, and they murmured in their hearts: When I called, would my neighbor interrupt my call because of a sudden online game or next file. Therefore, EPON management issues and QOS issues need to give villagers confidence. EPON’s significant advantage is that it has low requirements for devices, and is a unified Ethernet platform, which is simple to manage and low in cost. Therefore, EPON is approachable and inexpensive. However, EPON fans are not as good at talking as GPON fans. One unsightly aspect of EPON’s face is its speed. The downstream line rate of EPON is 1.25Gbps on the surface, but in order to reduce the requirements for basic devices, it adopts 8B/10B encoding, plus other overheads. This approachable price makes it actually transmit data at a rate of 600 -About 700Mbps. In this way, when GPON claims that its efficiency is high, it counts with its fingers. I don’t know how to calculate that its actual labor price is lower than EPON, so it starts to laugh at EPON: So you are Expensive PON. In this regard, the earliest fans of GPON, called flexLight, are the most exaggerated. They criticize EPON every few days, and they want to drown EPON with saliva. However, the management difficulty and cost introduced by GPON’s complex two-layer platform, and GPON’s handling of IP are difficult to explain at a glance. Everyone is also suspicious of this clamoring GPON. The villagers did not neglect EPON because of this, but were always concerned about the growth of the two brothers EPON and GPON. The so-called, road knows horsepower, and it takes a long time to see fat (PON) heart!

In fact, these three brothers still have something in common. For example, their core device technology is somewhat special compared to other optical fiber family brothers. For example, on passive devices, they need single-fiber bidirectional devices, BIDI, so that the downstream signal generally uses a wavelength of 1490nm and the upstream signal uses a wavelength of 1310 to achieve the purpose of transmitting signals in two directions on a single fiber. On active devices, there is a requirement for burst acceptance and emission.

Because the signals from different ONUs to the OLT have different distances, the amplitude and timing of the signals received by the OLT vary greatly. Therefore, both ONU transmission and OLT reception need to react quickly. So the corresponding chip is also difficult to develop. However, the two brothers, EPON and GPON, each had their own brains. EPON uses 8B/10B encoding to reduce the difficulty of timing recovery. As for GPON, the ONU is required to be able to perform power control, and try to make the amplitude of the OLT signal not so large, which also reduces the requirements for the underlying devices.

The three PON brothers also have a magic weapon in common, which is the ‘video overlay’ technology. This is a convenient technology that supports video transmission. It is to add a light with a wavelength of 1555nm on the downstream line, and directly add digital or analog video information to the light wave through radio frequency modulation. In this way, a large capacity of video signals can be transmitted, and network changes are also small, which is very convenient. Once they use this magic weapon, the people in the village will call them VPON (video PON). Due to the need to distinguish three wavelengths, in this case, PON brothers need one-way three-way device technology to support (optical triplexer). As one of the fans of PON, Infineon has done a good job in this regard. Of course, the people in the village ultimately want to upload TV to IP. As long as the TV is converted to IP through mpeg2, the PON brothers will use ATM and Ethernet protocol to support the transmission of the so-called IPTV. At this time, the three brothers need Each shows its magical powers.

One of their common enemies is the DSL family. There are many members in the DSL family, including ADSL, ADSL2, VDSL and other brothers. By the way, if you are interested in them, please checK link MA5616  for more details. They are different from the PON family relying on optical fiber for their food. The guy they make a living is the telephone line. PON has just begun to look down on the DSL family because they are slowly growing up. Like ADSL, the downstream rate is only 1M-2Mb/s, and the upstream rate is even lower. However, to their surprise, DSL was generally welcomed by people in the village, while PON was left out. Although the DSL family has inherent deficiencies, it is generally easy to learn. For example, VDSL can reach as much as 6M-8Mbps to make up for the deficiencies. And this support for voice and data services is sufficient. This is the main reason for suppressing PON.

PON then dreamed of a prosperous video services day, relying on its own broadband to defeat DSL. Because even if mpeg2 compression is used, a TV channel must occupy at least 2Mbps of bandwidth, DSL is not so confident. However, DSL charges are low, with the addition of ADSL2, VDSL, etc., and the start of IPTV services development depends on the DSL family. PON had to make the rear bigger, and sometimes it also supports pseudo-video information directly added to the light wave through radio frequency modulation. In this way, a large capacity of video signals can be transmitted, and network changes are also small, which is very convenient. Once they use this magic weapon, the people in the village will call them VPON (video PON). Due to the need to distinguish three wavelengths, in this case, the PON brothers need one-way three-way device technology to support (optical triplexer). As one of the fans of PON, Infineon does a good job in this regard. Of course, the people in the village ultimately want to upload TV to IP. As long as the TV is converted to IP through mpeg2, the PON brothers will use ATM and Ethernet protocol to support the transmission of the so-called IPTV. At this time, the three brothers need Each shows its magical powers.

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