Sunday, September 30, 2018

Facebook open sources LogDevice data store

Facebook is committing to the open source community its LogDevice distributed data store for sequential data.

LogDevice was originally developed and currently deployed within Facebook for a variety of workloads, including event streaming, replication pipelines, transaction logs, and deferred work journals. LogDevice comes with a command-line administration tool called LDShell.

https://code.fb.com/core-data/open-sourcing-logdevice-a-distributed-data-store-for-sequential-data/

Gremlin adds $18m in funding for its Failure-as-a-service

Gremlin, a start-up based in San Francisco, announced $18 million in Series B for its Failure-as-a-Service platform.

Gremlin, which was founded by a former engineer at Amazon and Netflix, said it helps customers build more resilient system through a new engineering philosophy called chaos engineering. The new tool simulates how a system would react when encountering challenges, such as network latency, data center outages, etc. With nearly a dozen attacks and more launching soon, Gremlin recreates the most common failures across three categories: Resource, Network, and State. The Gremlin tool is delivered as a subscription-based service, with pricing based on per instance or service.

The new funding round was led by Redpoint Ventures.

“The concept of purposefully injecting harm into systems is still new for many companies, but chaos engineering has been practiced at places like Amazon and Netflix for over a decade,” said Kolton Andrus, CEO and Co-Founder of Gremlin. “We like to use the analogy of a flu shot, injecting small amounts of harm to build an immunity, in order to proactively avoid disasters. Now with ALFI, users will be able to bring this practice to serverless environments, and have much greater control within their applications.”

Zayo to supply high-bandwidth IP to Mexican carrier

Zayo announced a contract to provide a high-bandwidth IP solution to a leading Mexican carrier. The solution will facilitate interconnection to U.S.-based content, gaming and webscale companies via Zayo’s data center at 1950 N. Stemmons in Dallas.

Zayo operates a Tier 1 IP backbone delivering IP solutions in North American and European data centers and Internet exchange points.

“We continue to see growing demand from global carriers for interconnection, and we are leveraging our international experience to make inroads in strategic markets,” said Randy Dunbar, president of Transport at Zayo. “This transaction is a success story of flexibility and agility, underscoring our commitment to global customers. In addition to this IP solution, we are providing the platform for this carrier to connect to major markets that Zayo serves.”

Molex to acquire Laird Connected Vehicle Solutions Division

Molex agreed to acquire the Connected Vehicle Solutions division of Laird Limited. Financial terms were not disclosed.

Laird CVS specializes in the design, development and delivery of vehicle antenna systems, smart device integration and vehicle connectivity devices.

Molex said the acquired solutions will add to its agile connected vehicle technology ecosystem, which feature a 10Gbps Ethernet backbone for automotive OEMs building next-generation, intelligent vehicles.

“There is tremendous demand for seamless end-to-end network integration across hardware, software and services in the automotive industry,” said Tim Ruff, senior vice president, Molex Business Development. “Laird CVS expands our geographic reach and strengthens our ability to support automotive OEMs seeking to introduce future-ready vehicles with critical functionality while still containing costs. It aligns with our strategy to provide groundbreaking solutions for a growth market.”


Thursday, September 27, 2018

Facebook plans big expansion of Virginia data center campus

Facebook announced a major expansion of its data center campus in Henrico County, Virginia.

Under the plan, Facebook will build two new data center buildings, for a total of five at this campus.

Facebook said the expansion builds on its original $1 billion investment in its initial 940,000 square foot campus, and that there are currently more than 800 construction workers on-site and, so far, over 925,000 hours have gone into building the project.

Facebook also noted that it is working with Dominion Energy to develop additional renewable energy resources that will support the campus.

MAREA redefines the transAtlantic subsea bandwidth equation

Construction of the highest-capacity subsea cable to cross the Atlantic is now complete.

The 6,600 km MAREA subsea cable, which was jointly funded by Microsoft and Facebook, links Virginia Beach, Virginia to Bilbao, Spain. The cable will be managed by Telxius, Telefónica’s new infrastructure company. The cable features eight fiber pairs and an initial estimated design capacity of 160 Tbps.

The cable takes a more southern route than other transatlantic cables, which mostly connect northern Europe to the New York/New Jersey region.

“Marea comes at a critical time,” says Brad Smith, president of Microsoft. “Submarine cables in the Atlantic already carry 55 percent more data than trans-Pacific routes and 40 percent more data than between the U.S. and Latin America. There is no question that the demand for data flows across the Atlantic will continue to increase and Marea will provide a critical connection for the United States, Spain, and beyond."


  • TE SubCom served as the system supply partner for MAREA.

AWS intros EC2 12 TB instances for large in-memory databases

Amazon Web Services (AWS) announced the availability of new High Memory instances for Amazon Elastic Compute Cloud (Amazon EC2) for running large in-memory databases, including production deployments of SAP HANA.

Amazon EC2 High Memory instances deliver 6 TB, 9 TB, and 12 TB of memory today, with 18 TB and 24 TB instances coming in 2019.

These are the largest memory sizes available in the cloud, according to AWS.

“Amazon EC2 provides the most comprehensive selection of instances by far, giving customers the flexibility to select the right instance for the right workload today and into the future,” said Matt Garman, Vice President of Compute Services at AWS. “We have memory-optimized instances today, and they’ve proven quite popular with customers who want to run memory-intensive applications, including in-memory databases. With 12 TB instances available in AWS, and 24 TB instances coming next year, Amazon EC2 High Memory instances give our customers the ability to scale their in-memory database with predictable performance in the same VPC as their other AWS services. Customers can grow their in-memory database and easily connect it to their storage, networking, analytics, IoT, and machine learning services – helping them make faster and better business decisions.”

SoftBank tests Non-IP Data Delivery for NB-IoT

SoftBank is testing NIDD (Non-IP Data Delivery) for NB-IoT over its commercial network.

NIDD, which is defined by 3GPP, enables users to transmit data to IoT devices without allocating an IP address. Two benefits are cited: better security by not using IP in transmission; and better efficiency by not requiring header information.

SoftBank said it aims to leverage NIDD technology to introduce and commercialize devices tailored to various businesses and fields such as crime prevention, social infrastructure and agriculture, making full use of its distinctive features of high security, low power consumption, and high area coverage.


Akira Sakakibara, CTO at Microsoft Japan, stated “We expect that NIDD technology to reduce communication load for IoT devices and enables to accelerate utilization in IoT field especially for those who had difficulty in conventional condition. As NIDD technology corresponds to open standards, it can easily connects to Microsoft Azure IoT platform and enable to implement data management, view and AI features. SoftBank and Microsoft Japan will continuously contribute to accelerate IoT technology utilization in every industry.”

Tadashi Okazaki, Head of Solution Architect, Amazon Web Services Japan K.K., said “Along with the popularization and growth of IoT technology, absolute security for IoT devices itself is strongly in demand. With the implementation of NIDD technology which securely connect AWS IoT platform and peripheral device, we expect to accelerate the popularization of IoT technology. Low power consumption is one of the characteristic of NIDD technology. Therefore, we hope to solve long discussed controversy of IoT devices high power consumptions.”

Cignal AI: Compact modular optical equipment market to top $1 billion in 2018

The market for compact modular optical equipment is on track to top $1 billion in revenue this year, according to the latest Optical Applications Report from Cignal AI. the category includes equipment designed specifically for use in DCI, open & disaggregated hardware applications.

Cignal AI has raised its CY18 forecast for 200G and 400G coherent port shipments and cut its 100G coherent forecast.

“Operators are rapidly adopting second and third generation coherent technology as they seek to lower their cost per bit and achieve better performance. This has resulted in higher than expected demand for 200G and 400G speeds this year, at the expense of first-generation coherent,” said Andrew Schmitt, lead analyst for Cignal AI. “Compounding this trend is the growing adoption of 200G CFP2 DCO modules, which allows coherent technology to integrate with switches and routers more easily than earlier solutions.”

Some highlights from Cignal AI:

  • Ciena and Huawei Top Compact Modular Market Growth – In this record quarter, Ciena and Huawei were the fastest-growing vendors in the compact modular segment. Ciena benefits from its third-generation coherent technology, while Huawei was lifted by greater adoption from Chinese cloud operators. New entrant Nokia also grew share in its second quarter of serving this market.
  • Packet-OTN Market Grows with Incumbent Adoption – More incumbent network operators are using packet-OTN switching hardware to upgrade their transport networks. In North America, this segment grew 30 percent year-over-year as result of more deployments by Verizon and other large incumbents. Growth was also significant in EMEA and India, where Nokia has taken significant market share.
  • Third Generation Coherent Gaining Momentum – Even though the overall market slowed in 2Q18 as a result of ZTE’s shutdown, other vendors experienced healthy sales growth. Third generation coherent solutions are picking up steam with Ciena’s 400G offering doing well. Acacia, Huawei, Nokia, and NTT Electronics based solutions will reach the market within the next two quarters to challenge Ciena’s lead.
https://cignal.ai/2018/09/compact-modular-optical-equipment-market-on-pace-to-break-1-billion-in-2018/


ECOC 2018: Synopsys and SMART Photonics announce InP kit

At ECOC 2018, Synopsys and SMART Photonics, which is a European manufacturer of InP Photonics components with production and research facilities located in Eindhoven, The Netherlands, introduced a production-ready process design kit (PDK) based on SMART Photonics' Indium Phosphide (InP) process.

Synopsys said its PIC Design Suite, which comprises OptSim Circuit and OptoDesigner tools, provides a seamless PIC design flow from idea to manufacturing from a single solutions provider. The addition of the SMART PDK to OptSim Circuit, combined with the PDK's availability in OptoDesigner, enables users to use the PIC Design Suite to schematically capture and simulate InP-based PIC designs with the SMART PDK building blocks, and then synthesize and verify a SMART-foundry-compatible layout.

"This is another example of a world-class PIC foundry taking advantage of the new opportunities offered by rapid advances in photonic integration," said Tom Walker, group director of R&D for Synopsys' Photonic Solutions. "We are excited to be working with SMART Photonics and to be able to give our mutual customers the ability to design advanced custom photonic applications using the SMART Photonics InP semiconductor process."

http://www.synopsys.com

ECOC 2018: Inphi highlights 100G and 400G Single Lambda PAM4

At ECOC 2018, Inphi highlighted its ecosystem collaboration with multiple optical solution industry leaders, including AOI, Delta Electronics and Source Photonics, showing readiness in delivering 100Gbps and 400Gbps PAM4 based module solutions for hyperscale cloud data center networks.

“As the pioneer of PAM based solutions with a proven history in the data center, Inphi is excited to be demonstrating single lambda PAM4 based solutions in conjunction with multiple industry leaders at ECOC 2018,” said Siddharth Sheth, SVP, Networking Interconnects at Inphi. “Multi-vendor interoperability coupled with adhering to strict compliant standards, allows this ecosystem of vendors to successful advance the adoption of PAM4 based solutions quickly and efficiently.”

“In order for 100Gbps and 400Gbps PAM4 based optical solutions to become a reality, strong collaboration across the industry is critical,” said Seamus Crehan, president and founder of Crehan Research Inc. “This ecosystem of industry leaders will help to advance the quick adoption and interoperability of PAM4 based systems and make single lambda optical solutions for 12.8T switch platforms a reality.”

“As the industry continues to move to higher data rates, it becomes vital to build a healthy ecosystem through value-driven partnerships. Inphi Corporation has been an important partner in the development of our 100G and 400G solutions,” said Robinson Tsai, VP of R&D of AOI Taiwan and AOI China. “We are excited to work together with this collaboration of leaders to build the next generation high-speed transmission technology.”

“We work closely with Inphi on 100Gbps and 400Gbps PAM4 based solutions. We see the emergence of 100Gbps and 400Gbps PAM4 solutions for next generation of hyperscale cloud data center networks and Inphi is one of the leading companies providing advance technologies,” said Ted Kuo, CBU BU Head at Delta Electronics Inc.

“Many successful demonstrations at this years’ ECOC show that the single lambda 100G ecosystem is coming together and will be ready for deployment in the field in 2019,” said Ed Ulrichs, director of PLM at Source Photonics. “Inphi is a trusted industry partner that is enabling us to productize both 100G and 400G solutions using a variety of solutions at both 28Gbaud and 53Gbaud per lane. We are excited to partner with Inphi to meet both performance and time-to-market needs for advanced transceiver solutions.”

ECOC 2018: Tektronix shows PAM4 test and debug solutions

At ECOC 2018, Tektronix showcased its optical test solutions, including:
  • PAM 4 Testing - DSA8300 sampling oscilloscope with an 80GHz optical sampling module showing support for IEEE 802.3bs based 400G optical testing for TDECQ, including new advances in high-sensitivity single-mode/multi-mode optical measurements for NRZ and PAM-4.
  • PAM 4 design and debug- DPO70000SX 70GHz ATI performance oscilloscope analyze single shot PAM-4 signals with live triggering and post-equalized error detection for 400G standards.
  • Complex Coherent testing - an end-to-end demonstration of optical modulation analysis software supporting multi-OMA systems, featuring the AWG70000 Series Arbitrary Waveform Generator and the DPO70000SX oscilloscope for applications such as spatial division multiplexing and more.
  • Support for new emerging standards - 400G ZR Receiver Testing - featuring the Tektronix DPO70000SX 70GHz ATI performance oscilloscope


Nokia Bell Labs joins Alex Thomson Racing for Vendée Globe race

Nokia Bell Labs will serve as Technology Partner to UK-based sailing team Alex Thomson Racing.

Skipper Alex Thomson, supported by his onshore team, will compete in the next Vendée Globe race, a 24,000-mile solo, non-stop unassisted sailing race around the world. The next Vendée Globe is scheduled to begin in November 2020.

The Vendée Globe race is often described as "the ultimate physical and psychological challenge" especially as the boats traverse the Southern Ocean.

Nokia Bell Labs said it will work alongside Thomson - and his IMOCA 60 race boat – to develop and test both existing and new cutting-edge technologies including augmented intelligence and wearables.

Nokia Chief Technology Officer and Bell Labs President, Marcus Weldon, said: “We are delighted to be working with Alex Thomson Racing to push the limits of what is possible, and pioneer breakthroughs in the seamless integration of human talent and technological performance, in extremely harsh and often remote environments, in a race against time.

"Alex Thomson Racing represents an important microcosm of the broader industrial IoT and mission-critical network focus of Nokia. This collaboration is another step toward realization of our Future X Network Vision, where human existence will be transformed in an era defined by the digitization and connection of everything and everyone with the goal of automating much of life, effectively creating time, by maximizing the efficiency of everything we do."

http://www.bell-labs.com
https://www.vendeeglobe.org/

Wednesday, September 26, 2018

In Memoriam: Sir Charles Kuen Kao, 1933-2018, Pioneer of Fiber Optics

Sir Charles Kuen Kao, recipient of the 2009 Nobel Prize in Physics, passed away on September 23rd in Hong Kong.

Dr. Kao, who was often called the "Father of Fibre Optics", is credited with breakthrough research in the realization of fiber optics as a telecommunications medium in the 1960s while at Standard Telecommunication Laboratories (STL) based in Harlow, UK. He earned his Ph.D. in electrical engineering in 1965 from University College London.

Over his career, Dr. Kao published more than 100 papers and was granted over 30 patents. He was the founder of the Department of Electronics at Chinese University of Hong Kong and later became vice chancellor of the university. In 2010, he was awarded the Most Excellent Order of the British Empire (KBE).

IEEE posted the following tribute to Dr. Kao
https://spectrum.ieee.org/tech-talk/tech-history/cyberspace/remembering-the-remarkable-feat-of-charles-kao


FCC eases regulatory barriers for small cells and 5G infrastructure

The FCC adopted an order aimed at removing regulatory barriers that inhibit the deployment of infrastructure necessary for 5G and other advanced wireless services.

In a Declaratory Ruling, the FCC focuses primarily on local fees for the authorizations necessary to deploy small wireless facilities.  Specifically, the Declaratory Ruling concludes that state and local governments may not charge fees that "are greater than a reasonable approximation of objectively reasonable costs for processing applications and for managing deployments in the rights-of-way." The ruling sets specific fee levels for small wireless facility deployments that presumably comply with the relevant standard; and provides guidance on when certain state and local non-fee requirements that are allowed, such as aesthetic and undergrounding requirements—may constitute an effective prohibition of service.

The second part of the FCC's decision establishes two new shot clocks for small wireless facilities (60 days for collocation on preexisting structures and 90 days for new builds); and codifies the existing 90 and 150 day shot clocks for wireless facility deployments that do not qualify as small cells that were established in 2009.

FCC Chairman Ajit Pai stated "To be sure, there are some local governments that don’t like this Order.  They would like to continue extracting as much money as possible in fees from the private sector and forcing companies to navigate a maze of regulatory hurdles in order to deploy wireless infrastructure.  But these actions are not only unlawful, they’re also short-sighted.  They slow the construction of 5G networks and will delay if not prevent the benefits of 5G from reaching American consumers.  And let’s also be clear about one thing:  When you raise the cost of deploying wireless infrastructure, it is those who live in areas where the investment case is the most marginal—rural areas or lower-income urban areas—who are most at risk of losing out.  And I don’t want 5G to widen the digital divide; I want 5G to help close that divide."

Dissenting, in part, FCC Commissioner Jessica Rosenworcel writes: "Instead of working with our state and local partners to speed the way to 5G deployment, we cut them out.  We tell them that going forward Washington will make choices for them—about which fees are permissible and which are not, about what aesthetic choices are viable and which are not, with complete disregard for the fact that these infrastructure decisions do not work the same in New York, New York and New York, Iowa.  So it comes down to this: three unelected officials on this dais are telling state and local leaders all across the country what they can and cannot do in their own backyards.  This is extraordinary federal overreach."

http://www.fcc.gov

Ericsson and Telstra complete 100-km NB-IoT connection

Ericsson and Telstra announced a technical milestone for extending IoT over long distances.

The companies have deployed and tested Narrowband Internet of Things (NB-IoT) data connections up to 100km from a base-station in Telstra’s commercial network — the longest-range NB-IoT connection of its kind.

Telstra said this helps extend its LTE footprint in rural and regional Australia.

Ericsson notes the achievement extends the 3GPP standards-based limit from around 40km out to 100km and is activated entirely through software upgrades, with no changes required to NB-IoT devices.

Telstra launched Cat M1 coverage in 2017 over an approximate three million square kilometers before deploying NB-IoT technology in its IoT network in January 2018. With this new capability, Telstra’s NB-IoT coverage increases to more than three and a half million square kilometers and will provide enhanced accessibility and reliability.

Channa Seneviratne, Telstra’s Executive Director, Network and Infrastructure Engineering, says: “Telstra already had Australia’s largest IoT coverage with Cat M1 across our 4G metro, regional and rural coverage footprint. With this NB-IoT extended range feature, we have now extended our coverage to more than three and a half million square kilometers, delivering our customers the best IoT coverage and capability in the country. Once again Telstra, working closely in partnership with Ericsson, has delivered innovation that ensures the benefits of IoT technology can be enjoyed by the largest number of Australians, not just those in the cities and towns.”

ECOC 2018: Cisco shows 400 Gigabit Ethernet Nexus switch

At ECOC 2018. as part of the 100G Lambda multisource agreement (MSA) interoperability demonstration, Cisco demonstrated Nexus 32-port 100 GbE & 400 GbE 1RU switches populated with modules from various manufacturers.

In a blog post, Cisco's Mark Nowell writes "It is very exciting that 400 GbE is now becoming available for testing, deployment, and adoption by network operators, paving the way for Terabit Scale Ethernet being a mainstream technology. There will be many more announcements in the future but it is important to mark this key milestone!"

https://blogs.cisco.com/datacenter/cisco-makes-terabit-scale-ethernet-networking-a-reality-with-400-gbe-technology


ECOC 2018: EXFO reveals open transceiver system for testing 400G and up

At ECOC 2018, EXFO unveiled a new 400G test module featuring its Open Transceiver System (OTS), which is a modular design concept that enables compatibility between current or future high-speed transceivers and EXFO's test platforms (lab and field).

EXFO said inserts to test specific transceiver types, including those used in 400G systems (e.g., QSFP-DD, OSFP, COBO, and CFP8), eliminate the need to replace entire testing modules and can be interchanged directly in the lab, out in the field or on the production floor. The OTS debuts on the new FTBx-88460 Power Blazer: a compact testing solution that supports all of today's latest high-speed ecosystem technologies (400G, FlexE and OTUCn/FlexO) and transceivers on a single module.

"We are proud of our position at the core of the 400G ecosystem—demonstrated by our participation alongside key industry partners in important interoperability events at ECOC," said Stéphane Chabot, EXFO's Vice President, Test and Measurement. "These activities, strategic relationships and new innovations contribute to our goal of delivering smart solutions that help our customers get the most from their testing investments while staying ahead of the 400G curve."

"Xilinx is pleased to partner with the EXFO team in a FlexE (Flex Ethernet) interoperability demonstration taking place during ECOC 2018. The Xilinx leadership FlexE solution combined with the EXFO test platform leadership clearly show that the FlexE and 400G ecosystem is mature and ready for production. FlexE is becoming an increasingly important component of the network evolution. Proven interoperability between Xilinx's leading FPGA, FlexE IP and design platform and EXFO's test and measurement products provide confidence to our customer base", said Farhad Shafai, Vice President Communications Markets, Xilinx.

ECOC 2018: Sicoya shows 100G Embedded Optical Module, 400G DR4

At ECOC 2018, Sicoya held private demonstrations of one chip 100G solutions based on its SETR-CDR-E100 Silicon Photonic Engine, which integrates CDRs, TIAs, drivers, modulators, and PINs. The engine enables QSFP28 transceivers using chip on board assembly technology or embedded optical modules utilizing Sicoya's optical ASIC packaging solution.

Highlights:
  • a 100G Embedded Optical Module (EOM) that comes in a 20x20mm BGA ASIC package. The EOM can be soldered to the main board and is optically pluggable utilizing Sicoyas optical connector system. 
  • sampling of the SETR-E400 monolithically integrated Silicon Photonic 400G DR4 engine along with the SIGT-I200 400Gb/s PAM4 Gearbox starts in Q4 2018 to selected partners.
http://sicoya.com/


  • Sicoya, founded in January 2015, is a spin-off from TU Berlin based on continuous R&D in Silicon Photonics since 2007.

ECOC 2018: ColorChip shows 40-400G optical transceivers

At ECOC 2018, ColorChip showcased its portfolion of optical transceivers ranging from 40 to 400G.

During the exhibition, ColorChip demonstrated a new family of 100G-400G PAM4 optical transceivers, including 100G Single-Lambda PAM4 QSFP28, 200G FR4 (2km) and LR4 (10km) QSFP56 and 400G QSFP56-DD DR4/FR4 transceivers, built with power efficient uncooled DML/EML-based CWDM4 optical engines.

ColorChip's CEO, Yigal Ezra, commented: "Today we are proud to announce the availability of 200G QSFP56 FR4 beta samples and expect to have 400G DR4/FR4 samples available in Q4, proving once again our commitment to spearhead innovative optical interconnect solutions that will further advance a truly connected world".

ECOC 2018: MaxLinear intros 400 Gbps DR4 Optical Modules, 100G transceiver/driver

At ECOC 2018, MaxLinear introduced a 100 Gbps transceiver with integrated driver.

MaxLinear’s new MxL93512 is part of the Telluride family of devices, which are DSP SoCs with integrated electro-absorption modulated laser (EA-EML) drivers for 100 Gbps/400 Gbps optical interconnects. The new device allows optical module vendors to develop a 100 Gbps optical interconnect module in a compact form factor for intra-datacenter applications with a transmission distance up to 2 Kilometers.


The MxL9351x SoCs are suitable for use within QSFP28 module form factors. Two options are currently available: the MxL93512 that integrates an EA-EML driver with 1.8V PP SE swing, and the MxL93513 that offers differential 800mV peak-to-peak swing for non EA-EML-based optics.

Maxlinear said its Telluride family features several operating modes that can connect to multiple generations of switch ASICs (128x25G NRZ, 256x25G NRZ or 256x50G PAM4) enabling 3.2Tbps, 6.4Tbps or 12.8Tbps front panel capacity per data center rack unit. These different operating modes span a variety of optical module form factors such as QSFP28, SFP-DD, QSFP-DD, OSFP and COBO.

MaxLinear also announced support for 400 Gbps breakout mode clocking in its MxL9354x products. The functionality will be on display at the company’s stand (#684) at the European Conference on Optical Communication (ECOC) in Rome taking place from Sept. 24-26, 2018. MaxLinear’s Telluride 400 Gbps PAM4 DSP (MxL9354x), based on 100 Gbps single lambda technology, is enabling development of DR4 and FR4 optical modules for the upcoming hyperscale datacenter transition to 400 Gbps. The initial use case in this transition is expected to be dominated by use of 400 Gbps DR4 modules used in a breakout application. The breakout mode of a 400 Gbps DR4 module requires certain clocking considerations that allow for the four 100 Gbps lanes to be treated as independent 100 Gbps ports and connect to a 100 Gbps DR1 or FR1 module on the other side. The unique clocking architecture of the MxL9354x makes it possible to achieve this requirement seamlessly.

http://www.maxlinear.com