10G-EPON
Encyclopedia
The 10 Gbit/s Ethernet Passive Optical Network standard, better known as 10G-EPON allows computer network
connections over telecommunication provider infrastructure. The standard supports two configurations: symmetric, operating at 10 Gbit/s data rate in both directions, and asymmetric, operating at 10 Gbit/s in the downstream (provider to customer) direction and 1 Gbit/s in the upstream
direction. It was ratified as IEEE 802.3av standard in 2009.
task force of the Institute of Electrical and Electronics Engineers
(IEEE) 802.3 standards committeee
published standards that included a passive optical network
(PON) variant in 2004.
In March 2006, the IEEE 802.3 held a call for interest for a 10 Gbit/s Ethernet PON study group. According to the CFI materials, representatives from the following companies supported the formation of the study group:
Advance/Newhouse Communications, Aeluros, Agilent, Allied Telesyn, Alloptic, Ample Communications, Astar-ODSM, Broadcom
, Centillium Communications, China Netcom
, China Telecom
, Chunghwa Telecom
, Cisco Systems
, ClariPhy Communications, Conexant Systems, Corecess, Corning, Delta Electronics
, ETRI
, Fiberxon, FOTEK Optoelectronics, ImmenStar, Infinera
, ITRI
, KDDI R&D Labs., K-Opticom, Korea Telecom
, NEC
, OpNext, Picolight, Quake Technologies, Salira Systems, Samsung Electronics
, Softbank BB, Teknovus, Teranetics, Texas Instruments
, Telecom Malaysia, TranSwitch, UNH IOL, UTStarcom
, Vitesse.
By September 2006, IEEE 802.3 formed the 802.3av task force to produce a draft standard. In September 2009, the IEEE 802 Plenary ratified an amendment to 802.3 to make 802.3av-2009 a standard.
Major milestones:
building (known in the standard as Multi Dwelling Unit or MDU) customers. When deployed in the MDU configuration, one EPON ONU may be connected to up to a thousand subscribers.
The 10/10G-EPON employs a number of functions that are common to other point-to-point Ethernet standards. For example, such functions as 64B/66B line coding
, self-synchronizing scrambler, or gearbox are also used in optical fiber types of 10 Gigabit Ethernet
links.
(FEC) mechanism based on Reed-Solomon(255, 223)
. The FEC is mandatory for all channels operating at 10 Gbit/s rate, i.e., both downstream and upstream channels in symmetric 10 Gbit/s EPON and the downstream channel in the 10/1 Gbit/s asymmetric EPON. Upstream channel in the asymmetric EPON is the same as in 1 Gbit/s EPON, an optional frame-based FEC using Reed-Solomon(255, 239).
In the upstream direction, the 1 Gbit/s and 10 Gbit/s bands overlap. 1 Gbit/s band spreads from 1260 to 1360 nm; 10 Gbit/s band uses 1260 to 1280 nm band. This allows both upstream channels to share spectrum region characterized by low chromatic disperson, but requires the 1 Gbit/s and 10 Gbit/s channels to be separated in time domain. Since burst transmissions from different ONUs now may have different line rates, this method is termed dual-rate TDMA.
Various OLT implementations may support 1 Gbit/s and 10 Gbit/s transmissions only downstream direction, only upstream direction, or in both downstream and upstream directions. The following table illustrates which ONU types are simultaneously supported by various OLT implementations:
sector, recommendation number G.987.
Known as 10G-PON
, it has 10 Gbit/s downstream and 2.5 Gbit/s upstream, and is intended to coexist with ITU-IT's G.984
standard known as GPON instead of the IEEE standards.
Computer network
A computer network, often simply referred to as a network, is a collection of hardware components and computers interconnected by communication channels that allow sharing of resources and information....
connections over telecommunication provider infrastructure. The standard supports two configurations: symmetric, operating at 10 Gbit/s data rate in both directions, and asymmetric, operating at 10 Gbit/s in the downstream (provider to customer) direction and 1 Gbit/s in the upstream
Upstream (networking)
In computer networking, upstream refers to the direction in which data can be transferred from the client to the server . This differs greatly from downstream not only in theory and usage, but also in that upstream speeds are usually at a premium...
direction. It was ratified as IEEE 802.3av standard in 2009.
Standardization
The Ethernet in the first mileEthernet in the first mile
Ethernet in the first mile refers to using one of the Ethernet family of computer network protocols between a telecommunications company and a customer's premise. From the customer's point of view it is their "first" mile, although from the access networks' point of view it is known as the "last...
task force of the Institute of Electrical and Electronics Engineers
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers is a non-profit professional association headquartered in New York City that is dedicated to advancing technological innovation and excellence...
(IEEE) 802.3 standards committeee
IEEE 802.3
IEEE 802.3 is a working group and a collection of IEEE standards produced by the working group defining the physical layer and data link layer's media access control of wired Ethernet. This is generally a local area network technology with some wide area network applications...
published standards that included a passive optical network
Passive optical network
A passive optical network is a point-to-multipoint, fiber to the premises network architecture in which unpowered optical splitters are used to enable a single optical fiber to serve multiple premises, typically 16-128. A PON consists of an optical line terminal at the service provider's central...
(PON) variant in 2004.
In March 2006, the IEEE 802.3 held a call for interest for a 10 Gbit/s Ethernet PON study group. According to the CFI materials, representatives from the following companies supported the formation of the study group:
Advance/Newhouse Communications, Aeluros, Agilent, Allied Telesyn, Alloptic, Ample Communications, Astar-ODSM, Broadcom
Broadcom
Broadcom Corporation is a fabless semiconductor company in the wireless and broadband communication business. The company is headquartered in Irvine, California, USA. Broadcom was founded by a professor-student pair Henry Samueli and Henry T. Nicholas III from the University of California, Los...
, Centillium Communications, China Netcom
China Netcom
China Netcom, full name China Netcom Group Corporation Limited , abbreviated CNC, was a former telecommunication service provider in People's Republic of China...
, China Telecom
China Telecom
China Telecom Corp. Ltd. is a Chinese state-owned telecommunication company. It is the largest fixed line service and 3rd largest mobile telecommunication provider in the People's Republic of China.-Sectors:...
, Chunghwa Telecom
Chunghwa Telecom
Chunghwa Telecom is the largest telecommunications company in Taiwan. It has its headquarters in Zhongzheng District, Taipei on the remains of the old Taipei Prison.- History :...
, Cisco Systems
Cisco Systems
Cisco Systems, Inc. is an American multinational corporation headquartered in San Jose, California, United States, that designs and sells consumer electronics, networking, voice, and communications technology and services. Cisco has more than 70,000 employees and annual revenue of US$...
, ClariPhy Communications, Conexant Systems, Corecess, Corning, Delta Electronics
Delta Electronics
Delta Electronics, Inc., founded in 1971, is the world's largest provider of switching power supplies and DC brushless fans, as well as a major source for power management solutions, components, visual displays, industrial automation, networking products, and renewable energy solutions...
, ETRI
ETRI
The Electronics and Telecommunications Research Institute, Korea is a government-backed research institute in Daedeok Science Town in Daejeon, Republic of Korea...
, Fiberxon, FOTEK Optoelectronics, ImmenStar, Infinera
Infinera
Infinera Corporation is a manufacturer of long-haul WDM optical transmission equipment for the service provider market.Infinera claims to have changed the world of optical telecommunications with its “Digital...
, ITRI
Itri
Itri is a small city and comune in the central Italian region of Latium and the Province of Latina.Itri is an agricultural centre divided in two parts by a small river, the Pontone. It lies in a valley between the Monti Aurunci and the sea, not far from the Gulf of Gaeta...
, KDDI R&D Labs., K-Opticom, Korea Telecom
Korea Telecom
KT Corporation is a South Korean integrated wired/wireless telecommunication service provider. KT has an information & communications business, and has the largest portion of the South Korean local telephone and high-speed Internet business...
, NEC
NEC
, a Japanese multinational IT company, has its headquarters in Minato, Tokyo, Japan. NEC, part of the Sumitomo Group, provides information technology and network solutions to business enterprises, communications services providers and government....
, OpNext, Picolight, Quake Technologies, Salira Systems, Samsung Electronics
Samsung Electronics
Samsung Electronics is a South Korean multinational electronics and information technology company headquartered in Samsung Town, Seoul...
, Softbank BB, Teknovus, Teranetics, Texas Instruments
Texas Instruments
Texas Instruments Inc. , widely known as TI, is an American company based in Dallas, Texas, United States, which develops and commercializes semiconductor and computer technology...
, Telecom Malaysia, TranSwitch, UNH IOL, UTStarcom
UTStarcom
UTStarcom is a Fortune 1000 company that specializes in IP-based networking products for telecommunications companies and service providers. Its core markets are multimedia communications and broadband, including IP and entertainment , next generation broadband networks and optical network solutions...
, Vitesse.
By September 2006, IEEE 802.3 formed the 802.3av task force to produce a draft standard. In September 2009, the IEEE 802 Plenary ratified an amendment to 802.3 to make 802.3av-2009 a standard.
Major milestones:
| Date | Milestone |
|---|---|
| September 2006 | IEEE 802.3av task force was formed and met in Knoxville, Tennessee Knoxville, Tennessee Founded in 1786, Knoxville is the third-largest city in the U.S. state of Tennessee, U.S.A., behind Memphis and Nashville, and is the county seat of Knox County. It is the largest city in East Tennessee, and the second-largest city in the Appalachia region... . |
| December 2007 | Draft D1.0 produced. |
| July 2008 | Draft D2.0 produced. Working Group balloting began. |
| November 2008 | Cut-off date for last technical change |
| January 2009 | Draft D3.0 produced. Sponsor balloting began. |
| September 2009 | Standard approved. |
Symmetric (10/10G-EPON)
Symmetric-rate 10/10G-EPON supports transmit and receive data paths operating at 10 Gbit/s. The main driver for 10/10G-EPON was to provide adequate downstream and upstream bandwidth to support multi-family residentialMulti-family residential
Multi-family residential is a classification of housing where multiple separate housing units for residential inhabitants are contained within one building or several buildings within one complex. A common form is an apartment building...
building (known in the standard as Multi Dwelling Unit or MDU) customers. When deployed in the MDU configuration, one EPON ONU may be connected to up to a thousand subscribers.
The 10/10G-EPON employs a number of functions that are common to other point-to-point Ethernet standards. For example, such functions as 64B/66B line coding
64b/66b encoding
In data networking and transmission, 64b/66b is a line code that transforms 64-bit data to 66-bit line code to provide enough state changes to allow reasonable clock recovery and facilitate alignment of the data stream at the receiver....
, self-synchronizing scrambler, or gearbox are also used in optical fiber types of 10 Gigabit Ethernet
10 Gigabit Ethernet
The 10 gigabit Ethernet computer networking standard was first published in 2002. It defines a version of Ethernet with a nominal data rate of 10 Gbit/s , ten times faster than gigabit Ethernet.10 gigabit Ethernet defines only full duplex point to point links which are generally connected by...
links.
Asymmetric (10/1G-EPON)
The asymmetric 10/1G-EPON appear less challenging than the symmetric option, as this specification relies on fairly mature technologies. The upstream transmission is identical to that of the 1G-EPON (as specified in IEEE standard 802.3ah), using deployed burst-mode optical transceivers. The downstream transmission, which uses continuous-mode optics, will rely on the maturity of 10 Gbit/s point-to-point Ethernet devices.Power budgets
The 802.3av defines several power budgets, denoted either PR or PRX. PRX power budget describes asymmetric–rate PHY for PON operating at 10 Gbit/s downstream and 1 Gbit/s upstream. PR power budget describes symmetric–rate PHY for PON operating at 10 Gbit/s downstream and 10 Gbit/s upstream. Each power budget is further identified with a numeric representation of its class, where value of 10 represents low power budget, value of 20 represents medium power budget, and value of 30 represents high power budget. The 802.3av draft standard defines the following power budgets:| Power Budget | Downstream Line Rate (Gbit/s) |
Upstream Line Rate (Gbit/s) |
Channel Insertion Loss (dB) |
Notes |
|---|---|---|---|---|
| PRX10 | 10.3125 | 1.25 | 20 | compatible with PX10 power budget defined for 1G-EPON |
| PRX20 | 10.3125 | 1.25 | 24 | compatible with PX20 power budget defined for 1G-EPON |
| PRX30 | 10.3125 | 1.25 | 29 | |
| PR10 | 10.3125 | 10.3125 | 20 | compatible with PX10 power budget defined for 1G-EPON |
| PR20 | 10.3125 | 10.3125 | 24 | compatible with PX20 power budget defined for 1G-EPON |
| PR30 | 10.3125 | 10.3125 | 29 |
Forward error correction
The 10G-EPON employs a stream-based forward error correctionForward error correction
In telecommunication, information theory, and coding theory, forward error correction or channel coding is a technique used for controlling errors in data transmission over unreliable or noisy communication channels....
(FEC) mechanism based on Reed-Solomon(255, 223)
Reed–Solomon error correction
In coding theory, Reed–Solomon codes are non-binary cyclic error-correcting codes invented by Irving S. Reed and Gustave Solomon. They described a systematic way of building codes that could detect and correct multiple random symbol errors...
. The FEC is mandatory for all channels operating at 10 Gbit/s rate, i.e., both downstream and upstream channels in symmetric 10 Gbit/s EPON and the downstream channel in the 10/1 Gbit/s asymmetric EPON. Upstream channel in the asymmetric EPON is the same as in 1 Gbit/s EPON, an optional frame-based FEC using Reed-Solomon(255, 239).
Backward compatibility
The 10G-EPON standard defines a new physical layer, keeping the MAC, MAC Control and all the layers above unchanged to the greatest extent possible. This means that users of 10G-EPON can expect backward compatibility of network management system (NMS), PON-layer operations, administrations, and maintenance (OAM) system, DBA and scheduling, and so on.Coexistence with 1G-EPON
The 802.3av standard places significant emphasis on enabling simultaneous operation of 1 Gbit/s and 10 Gbit/s EPON systems on the same outside plant. In the downstream direction, the 1 Gbit/s and 10 Gbit/s channels are separated in the wavelength domain, with 1 Gbit/s transmission limited to 1480-1500 nm band and 10 Gbit/s transmission using 1575-1580 nm band.In the upstream direction, the 1 Gbit/s and 10 Gbit/s bands overlap. 1 Gbit/s band spreads from 1260 to 1360 nm; 10 Gbit/s band uses 1260 to 1280 nm band. This allows both upstream channels to share spectrum region characterized by low chromatic disperson, but requires the 1 Gbit/s and 10 Gbit/s channels to be separated in time domain. Since burst transmissions from different ONUs now may have different line rates, this method is termed dual-rate TDMA.
Various OLT implementations may support 1 Gbit/s and 10 Gbit/s transmissions only downstream direction, only upstream direction, or in both downstream and upstream directions. The following table illustrates which ONU types are simultaneously supported by various OLT implementations:
| OLT Implementation | Supported ONU types |
|---|---|
| Downstream: two wavelengths Upstream: single rate |
(1) 1G-EPON ONU (2) 10/1G-EPON ONU |
| Downstream: single wavelength Upstream: dual rate |
(1) 10/10G-EPON ONU (2) 10/1G-EPON ONU |
| Downstream: two wavelengths Upstream: dual rate |
(1) 1G-EPON ONU (2) 10/1G-EPON ONU (3) 10/10G-EPON ONU |
Related standard
Another standards body, the International Telecommunications Union has a similar standard in the ITU-TITU-T
The ITU Telecommunication Standardization Sector is one of the three sectors of the International Telecommunication Union ; it coordinates standards for telecommunications....
sector, recommendation number G.987.
Known as 10G-PON
10G-PON
10G-PON is a 2010 computer networking standard for data links, capable of delivering shared Internet access rates up to 10 Gbit/s over existing passive optics. Passive optical network architecture has become a cost effective way to meet performance demands in access networks...
, it has 10 Gbit/s downstream and 2.5 Gbit/s upstream, and is intended to coexist with ITU-IT's G.984
G.984
ITU-T Recommendation G.984 is a family of recommendations that defines gigabit passive optical networks for telecommunications access networks...
standard known as GPON instead of the IEEE standards.