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扫描下载二维码From Wikipedia, the free encyclopedia
40 Gigabit Ethernet (40GbE) and 100 Gigabit Ethernet (100GbE) are groups of
technologies for transmitting
at rates of 40 and 100
(40 and 100 Gbit/s), respectively. The technology was first defined by the
standard and later by the 802.3bg-bj-2014, and 802.3bm-2015 standards.
The standards define numerous port types with different optical and electrical interfaces and different numbers of
strands per port. Short distances over
are supported.
cabling for 40 Gbit/s over distances up to 30 m.
On July 18, 2006, a call for interest for a High Speed Study Group (HSSG) to investigate new standards for high speed Ethernet was held at the IEEE 802.3 plenary meeting in San Diego.
The first 802.3 HSSG study group meeting was held in September 2006. In June 2007, a trade group called "Road to 100G" was formed after the
trade show in Chicago.
On December 5, 2007, the Project Authorization Request (PAR) for the P802.3ba 40 Gbit/s and 100 Gbit/s Ethernet Task Force was approved with the following project scope:
The purpose of this project is to extend the 802.3 protocol to operating speeds of 40 Gb/s and 100 Gb/s in order to provide a significant increase in bandwidth while maintaining maximum compatibility with the installed base of 802.3 interfaces, previous investment in research and development, and principles of network operation and management. The project is to provide for the interconnection of equipment satisfying the distance requirements of the intended applications.
The 802.3ba task force met for the first time in January 2008. This standard was approved at the June 2010 IEEE Standards Board meeting under the name IEEE Std 802.3ba-2010.
The first 40 Gbit/s Ethernet Single-mode Fibre PMD study group meeting was held in January 2010 and on March 25, 2010 the P802.3bg Single-mode Fibre PMD Task Force was approved for the 40 Gbit/s serial SMF PMD.
The scope of this project is to add a single-mode fiber Physical Medium Dependent (PMD) option for serial 40 Gb/s operation by specifying additions to, and appropriate modifications of, IEEE Std 802.3-2008 as amended by the IEEE P802.3ba project (and any other approved amendment or corrigendum).
On June 17, 2010, the IEEE 802.3ba standard was approved
In March 2011 the IEEE 802.3bg standard was approved. On September 10, 2011, the P802.3bj 100 Gbit/s Backplane and Copper Cable task force was approved.
The scope of this project is to specify additions to and appropriate modifications of IEEE Std 802.3 to add 100 Gb/s 4-lane Physical Layer (PHY) specifications and management parameters for operation on backplanes and
copper cables, and specify optional Energy Efficient Ethernet (EEE) for 40 Gb/s and 100 Gb/s operation over backplanes and copper cables.
On May 10, 2013, the P802.3bm 40 Gbit/s and 100 Gbit/s Fiber Optic Task Force was approved.
This project is to specify additions to and appropriate modifications of IEEE Std 802.3 to add 100 Gb/s Physical Layer (PHY) specifications and management parameters, using a four-lane electrical interface for operation on multimode and single-mode fiber optic cables, and to specify optional Energy Efficient Ethernet (EEE) for 40 Gb/s and 100Gb/s operation over fiber optic cables. In addition, to add 40 Gb/s Physical Layer (PHY) specifications and management parameters for operation on extended reach (&10 km) single-mode fiber optic cables.
Also on May 10, 2013, the P802.3bq 40GBASE-T Task Force was approved.
Specify a Physical Layer (PHY) for operation at 40 Gb/s on balanced twisted-pair copper cabling, using existing Media Access Control, and with extensions to the appropriate physical layer management parameters.
On June 12, 2014, the IEEE 802.3bj standard was approved. On February 16, 2015, the IEEE 802.3bm standard was approved. On May 12, 2016, the IEEE P802.3cd Task Force started working to define next generation two-lane 100 Gbit/s PHY.
The IEEE 802.3 working group is concerned with the maintenance and extension of the Ethernet data communications standard. Additions to the 802.3 standard are performed by task forces which are designated by one or two letters. For example, the 802.3z task force drafted the original
802.3ba is the designation given to the higher speed Ethernet task force which completed its work to modify the 802.3 standard to support speeds higher than 10 Gbit/s in 2010.
The speeds chosen by 802.3ba were 40 and 100 Gbit/s to support both end-point and link aggregation needs. This was the first time two different Ethernet speeds were specified in a single standard. The decision to include both speeds came from pressure to support the 40 Gbit/s rate for local server applications and the 100 Gbit/s rate for internet backbones. The standard was announced in July 2007 and was ratified on June 17, 2010.
A 40G-SR4 transceiver in the
form factor
The 40/100 Gigabit Ethernet standards encompass a number of different
(PHY) specifications. A networking device may support different PHY types by means of pluggable modules. Optical modules are not standardized by any official standards body but are in
(MSAs). One agreement that supports 40 and 100 Gigabit Ethernet is the
(CFP) MSA which was adopted for distances of 100+ meters.
connector modules support shorter distances.
The standard supports only
operation. Other electrical objectives include:
Preserve the 802.3 / Ethernet frame format utilizing the 802.3 MAC
Preserve minimum and maximum FrameSize of current 802.3 standard
(BER) better than or equal to 10-12 at the MAC/PLS service interface
Provide appropriate support for
data rates of 40 and 100 Gbit/s
Provide physical layer specifications (PHY) for operation over
(MMF) OM3 and OM4, copper cable assembly, and .
The following nomenclature is used for the physical layers:
Physical layer
40 Gigabit Ethernet
100 Gigabit Ethernet
100GBASE-KP4
Improved Backplane
40GBASE-KR4
100GBASE-KR4
7 m over
copper cable
40GBASE-CR4
100GBASE-CR10
100GBASE-CR4
30 m over "" twisted pair
100 m over OM3 MMF
40GBASE-SR4
100GBASE-SR10
100GBASE-SR4
125 m over OM4 MMF
2 km over SMF, serial
40GBASE-FR
100GBASE-CWDM4
10 km over SMF
40GBASE-LR4
100GBASE-LR4
40 km over SMF
40GBASE-ER4
100GBASE-ER4
The 100 m laser optimized multi-mode fiber (OM3) objective was met by parallel ribbon cable with 850 nm wavelength 10GBASE-SR like optics (40GBASE-SR4 and 100GBASE-SR10). The backplane objective with 4 lanes of 10GBASE-KR type PHYs (40GBASE-KR4). The copper cable objective is met with 4 or 10 differential lanes using SFF-8642 and SFF-8436 connectors. The 10 and 40 km 100 Gbit/s objectives with four wavelengths (around ;nm) of 25 Gbit/s optics (100GBASE-LR4 and 100GBASE-ER4) and the 10 km 40 Gbit/s objective with four wavelengths (around ;nm) of 10 Gbit/s optics (40GBASE-LR4).
In January 2010 another IEEE project authorization started a task force to define a 40 Gbit/s serial single-mode optical fiber standard (40GBASE-FR). This was approved as standard 802.3bg in March 2011. It used ;nm optics, had a reach of 2 km and was capable of receiving ;nm and ;nm wavelengths of light. The capability to receive ;nm light allows it to inter-operate with a longer reach ;nm PHY should one ever be developed. ;nm was chosen as the wavelength for 802.3bg transmission to make it compatible with existing test equipment and infrastructure.
In December 2010, a 10x10 multi-source agreement (10x10 MSA) began to define an optical
(PMD) sublayer and establish compatible sources of low-cost, low-power, pluggable optical transceivers based on 10 optical lanes at 10 Gbit/s each. The 10x10 MSA was intended as a lower cost alternative to 100GBASE-LR4 for applications which do not require a link length longer than 2 km. It was intended for use with standard single mode G.652.C/D type low water peak cable with ten wavelengths ranging from 1523 to ;nm. The founding members were , ,
and Santur. Other member companies of the 10x10 MSA included MRV, Enablence, Cyoptics, AFOP, , Hitachi Cable America, AMS-IX, EXFO, , Kotura, Facebook and Effdon when the 2 km specification was announced in March 2011. The 10X10 MSA modules were intended to be the same size as the C Form-factor Pluggable specifications.
On June 12, 2014, the 802.3bj standard was approved. The 802.3bj standard specifies 100 Gbit/s 4x25G PHYs - 100GBASE-KR4, 100GBASE-KP4 and 100GBASE-CR4 - for backplane and twin-ax cable.
On February 16, 2015, the 802.3bm standard was approved. The 802.3bm standard specifies a lower-cost optical 100GBASE-SR4 PHY for MMF and a four-lane chip-to-module and chip-to-chip electrical specification (CAUI-4). The detailed objectives for the 802.3bm project can be found on the 802.3 website.
All variants listed in the table share the 64b/66b , and the media count is given per direction (i.e. double the count is required to form a link.) RS-FEC refers to the Reed-Solomon Layer defined in Clause 91, introduced in IEEE 802.3bj. DP-QPSK refers to Dual polarization-quadrature phase shift keying.
40GBASE-CR4
40GBASE-CR4 ("copper") is a port type for twin-ax copper cable. Its 64b/66b
is defined in IEEE 802.3 Clause 82 and its
in Clause 85. It uses four lanes of twin-axial cable delivering serialized data at a rate of 10.;Gbit/s per lane.
CR4 involves two clauses: CL73 for auto-negotiation, and CL72 for link training. CL73 allows communication between the two PHYs to exchange technical capability pages, and both PHYs come to a common speed and media type. Once CL73 has been completed, CL72 starts. CL72 allows each of the four lanes' transmitters to adjust pre-emphasis via feedback from the link partner.
40GBASE-KR4
40GBASE-KR4 is a port type for backplanes. Normally backplanes are board traces, such as Megtron6 or FR4 materials. Its
64b/66b PCS is defined in IEEE 802.3 Clause 82 and its
PMD in Clause 84. It uses four lanes of backplane delivering serialized data at a rate of 10.;Gbit/s per lane.
As in CR4 case, KR4 involves 2 clauses, first CL73 for autoneg, followed by CL72 for link training. CL73 allows the communication between the 2 PHY's to exchange tech ability pages, and both PHYs come to a common speed and media type. Once CL73 has been completed, CL72 starts. CL72 allows each of the 4 lanes transmitter to adjust its preemphasis by way of feedback from the link partner.
40GBASE-SR4
40GBASE-SR4 ("short range") is a port type for
and uses 850 nm lasers. Its
64b/66b PCS is defined in IEEE 802.3 Clause 82 and its
PMD in Clause 86. It uses four lanes of multi-mode fiber delivering serialized data at a rate of 10.;Gbit/s per lane. 40GBASE-SR4 has a reach of 100 m on OM3 and 150m on OM4. There is a longer range variant 40GBASE-eSR4 with a reach of 300 m on OM3 and 400 m on OM4. This extended reach is equivalent to the reach of 10GBASE-SR.
40GBASE-LR4
40GBASE-LR4 ("long range") is a port type for
and uses ;nm lasers. Its
64b/66b PCS is defined in IEEE 802.3 Clause 82 and its
PMD in Clause 87. It uses four wavelengths delivering serialized data at a rate of 10.;Gbit/s per wavelength.
40GBASE-PLR4
40GBASE-PLR4 ("parallel long range") is a variant of 40GBASE-LR4 that uses 4 transmitters at 1310nm over 4 single mode fibers (rather than 4 wavelengths over 1 single mode fiber). Unlike LR4, PLR4 allows breakout to 4x 10G.
40GBASE-ER4
40GBASE-ER4 ("extended range") is a port type for
being defined in P802.3bm and uses ;nm lasers. Its
64b/66b PCS is defined in IEEE 802.3 Clause 82 and its
PMD in Clause 87. It uses four wavelengths delivering serialized data at a rate of 10.;Gbit/s per wavelength.
40GBASE-FR
40GBASE-FR is a port type for . Its
64b/66b PCS is defined in IEEE 802.3 Clause 82 and its
PMD in Clause 89. It uses ;nm optics, has a reach of 2 km and is capable of receiving ;nm and ;nm wavelengths of light. The capability to receive ;nm light allows it to inter-operate with a longer reach ;nm PHY should one ever be developed. ;nm was chosen as the wavelength transmission to make it compatible with existing test equipment and infrastructure.
40GBASE-T is a port type for 4-pair balanced twisted-pair
copper cabling up to 30 m defined in IEEE 802.3bq. IEEE 802.3bq-2016 standard was approved by The IEEE-SA Standards Board on June 30, 2016. It uses 16-level PAM signaling over four lanes at 3,200 MBaud each, scaled up from 10GBASE-T.
25GBASE-T is a 25 Gbit/s standard for 4-pair twisted pair that was approved alongside 40GBASE-T. It uses 16-level PAM signaling over four lanes at 2,000 MBaud each, scaled up from 10GBASE-T.
CAUI-10 is a 100 Gbit/s 10 lane electrical interface defined in 802.3ba.
CAUI-4 is a 100 Gbit/s 4 lane electrical interface defined in 802.3bm.
Pluggable Optics Form Factors
The + connector is specified for use with the 40GBASE-CR4/SR4, can be copper direct attached cable (DAC) or optical module, see Figure 85–20 in the 802.3 spec. QSFP modules at 40Gbps can also be used to provide four independent ports of
Optical Connectors
Short reach interfaces use Multiple-Fiber Push-On/Pull-off (MPO) connector, see subclause 86.10.3.3 of the 802.3 spec. 40GBASE-SR4 uses MPO-12 and 100GBASE-SR10 uses MPO-24, with individual optical lanes per fiber strand.
Long reach interfaces use duplex LC connectors with all optical lanes multiplexed with .
MSA defines hot-pluggable optical transceiver form factors to enable 40 Gbit/s and 100 Gbit/s applications. CFP modules use the 10-lane CAUI-10 electrical interface.
modules use the 10-lane CAUI-10 electrical interface or the 4-lane CAUI-4 electrical interface.
modules use the 4-lane CAUI-4 electrical interface.
modules use the CAUI-4 electrical interface.
has the CPAK optical module that uses the four lane CEI-28G-VSR electrical interface.
There are also
and HD module standards. CXP modules use the CAUI-10 electrical interface.
announced backplane modules in October 2010.
Copper cables
Quellan announced a test board in 2009.
Multimode fiber
and Reflex Photonics announced modules based on the CFP agreement.
Single mode fiber
, , and OpNext all demonstrated singlemode 40 or 100 Gbit/s Ethernet modules based on the C Form-factor Pluggable agreement at the European Conference and Exhibition on Optical Communication in 2009.
Compatibility
Optical fiber
implementations were not compatible with the numerous 40 and 100 Gbit/s line rate transport systems because they had different optical layer and modulation formats as the
show. In particular, existing 40 Gbit/s transport solutions that used
to pack four 10 Gbit/s signals into one optical medium were not compatible with the
standard, which used either
in ;nm wavelength region with four 25 Gbit/s or four 10 Gbit/s channels, or parallel optics with four or ten optical fibers per direction.
Test and measurement
developed Physical Coding Sublayer Lanes and demonstrated a working 100GbE link through a test setup at
in June 2008. Ixia announced test equipment in November 2008.
Discovery Semiconductors introduced
converters for 100 Gbit/s testing of the 10 km and 40 km Ethernet standards in February 2009.
introduced test and measurement products for 40 and 100 Gbit/s Ethernet in August 2009.
introduced test and measurement products in September 2009.
demonstrated interoperability in January 2010.
Xena Networks demonstrated test equipment at the
in January 2011.
introduced 100GbE
synchronisation test equipment in November 2014.
introduced the Attero-100G for 100GbE and 40GbE impairment emulation in April 2015.
VeEX introduced its CFP-based UX400-100GE and 40GE test and measurement platform in 2012, followed by CFP2, CFP4, QSFP28 and QSFP+ versions in 2015.
Unlike the "race to 10Gbps" that was driven by the imminent need to address growth pains of the
in the late 1990s, customer interest in 100 Gbit/s technologies was mostly driven by economic factors. The common reasons to adopt the higher speeds were:
to reduce the number of optical wavelengths ("lambdas") used and the need to light new fiber
to utilize bandwidth more efficiently than 10 Gbit/s
to provide cheaper wholesale, internet peering and data center connectivity
to skip the relatively expensive 40 Gbit/s technology and move directly from 10 to 100 Gbit/s
Optical signal transmission over a nonlinear medium is principally an analog design problem. As such, it has evolved slower than digital circuit lithography (which generally progressed in step with .) This explains why 10 Gbit/s transport systems existed since the mid-1990s, while the first forays into 100 Gbit/s transmission happened about 15 years later – a 10x speed increase over 15 years is far slower than the 2x speed per 1.5 years typically cited for Moore's law.
Nevertheless, at least five firms (Ciena, Alcatel-Lucent, MRV, ADVA Optical and Huawei) made customer announcements for 100 Gbit/s transport systems   by August 2011 – with varying degrees of capabilities. Although vendors claimed that 100 Gbit/s light paths could use existing analog optical infrastructure, deployment of high-speed technology was tightly controlled and extensive interoperability tests were required before moving them into service.
Designing routers or switches which support 100 Gbit/s interfaces is difficult. The need to process a 100 Gbit/s stream of packets at line rate without reordering within IP/MPLS microflows is one reason for this.
As of 2011, most components in the 100 Gbit/s packet processing path (PHY chips, , memories) were not readily available off-the-shelf or require extensive qualification and co-design. Another problem is related to the low-output production of 100 Gbit/s optical components, which were also not easily available – especially in pluggable, long-reach or tunable laser flavors.
In November 2007,
held the first field trial of 100 Gbit/s optical transmission. Completed over a live, in-service 504 kilometre portion of the Verizon network, it connected the Florida cities of Tampa and Miami.
100GbE interfaces for the 7450 ESS/7750 SR service routing platform were first announced in June 2009, with field trials with Verizon, T-Systems and Portugal Telecom taking place in June–September 2010. In September 2009, Alcatel-Lucent combined the 100G capabilities of its IP routing and optical transport portfolio in an integrated solution called Converged Backbone Transformation.
In June 2011, Alcatel-Lucent introduced a packet processing architecture known as FP3, advertised for 400 Gbit/s rates. Alcatel-Lucent announced the XRS 7950 core router (based on the FP3) in May 2012.
introduced the ConnectX-4 100GbE single and dual port adapter in November 2014. In the same period, Mellanox introduced availability of 100GbE copper and fiber cables. In June 2015, Mellanox introduced the Spectrum 10, 25, 40, 50 and 100GbE switch models.
introduced the C-GEP FPGA-based switching platform in February 2013. Aitia also produce 100G/40G Ethernet PCS/PMA+MAC IP cores for FPGA developers and academic researchers.
introduced the 7500E switch (with up to 96 100GbE ports) in April 2013. In July 2014, Arista introduced the 7280E switch (the world's first top-of-rack switch with 100G uplink ports).
introduced their first 100GbE products (based on the former Foundry Networks MLXe hardware) in September 2010. In June 2011, the new product went live at the
traffic exchange point in Amsterdam.
announced their 100GbE trials in June 2008. However, it is doubtful that this transmission could approach 100 Gbit/s speeds when using a 40 Gbit/s per slot CRS-1 platform for packet processing. Cisco's first deployment of 100GbE at
and Comcast took place in April 2011. In the same year, Cisco tested the 100GbE interface between CRS-3 and a new generation of their ASR9K edge router model.
introduced a four-port 100GbE module for the BlackDiamond X8 core switch in November 2012.
In October 2008,
presented their first 100GbE interface for their NE5000e router. In September 2009, Huawei also demonstrated an end-to-end 100 Gbit/s link. It was mentioned that Huawei's products had the self-developed NPU "Solar 2.0 PFE2A" onboard and was using pluggable optics in
form-factor.
In a mid-2010 product brief, the NE5000e linecards were given the commercial name LPUF-100 and credited with using two Solar-2.0 NPUs per 100GbE port in opposite (ingress/egress) configuration. Nevertheless, in October 2010, the company referenced shipments of NE5000e to Russian cell operator "Megafon" as "40Gbps/slot" solution, with "scalability up to" 100 Gbit/s.
In April 2011, Huawei announced that the NE5000e was updated to carry 2x100GbE interfaces per slot using LPU-200 linecards. In a related solution brief, Huawei reported 120 thousand Solar 1.0 integrated circuits shipped to customers, but no Solar 2.0 numbers were given. Following the August 2011 trial in Russia, Huawei reported paying 100 Gbit/ DWDM customers, but no 100GbE shipments on NE5000e.
announced 100GbE for its
routers in June 2009. The 1x100GbE option followed in Nov 2010, when a joint press release with academic backbone network
marked the first production 100GbE interfaces going live in real network.
In the same year, Juniper demonstrated 100GbE operation between core (T-series) and edge ( 3D) routers. Juniper, in March 2011, announced first shipments of 100GbE interfaces to a major North American service provider (Verizon).
In April 2011, Juniper deployed a 100GbE system on the UK education network . In July 2011, Juniper announced 100GbE with Australian ISP iiNet on their T1600 routing platform. Juniper started shipping the MPC3E line card for the MX router, a 100GbE CFP MIC, and a 100GbE LR4 CFP optics in March 2012[]. In Spring 2013, Juniper Networks announced the availability of the MPC4E line card for the MX router that includes 2 100GbE CFP slots and 8 10GbE SFP+ interfaces[].
In June 2015, Juniper Networks announced the availability of its CFP-100GBASE-ZR module which is a plug & play solution that brings 80 km 100GbE to MX & PTX based networks. The CFP-100GBASE-ZR module uses DP-QPSK modulation and coherent receiver technology with an optimized DSP and FEC implementation. The low-power module can be directly retrofitted into existing CFP sockets on MX and PTX routers.
switches support 40 Gbit/s interfaces. These 40 Gbit/s fiber-optical interfaces using QSFP+ transceivers can be found on the Z9000 distributed core switches, S4810 and S4820 as well as the . The
series switches also offer 40 Gbit/s QSFP+ interfaces.
introduced 40 Gbit/s Ethernet network adapters (based on the fifth generation of its Terminator architecture) in June 2013.
announced the dual 100G PCIe accelerator card, part of the MPAC-IP series. Telesoft also announced the STR 400G (Segmented Traffic Router) and the 100G MCE (Media Converter and Extension).
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