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The design would better support single-mode fiber, and the packaging would be easier with both the ASIC and optics being silicon. Hasharoni says that were he and his hardware colleagues to tackle a similar design today, they would use silicon photonics instead of VCSELs. Compass-EOS was developing a second-generation chip with a 16-Tb input–output before the project was canceled. The resulting chip with optical input–output consumed one-fifth of the power of a chip using electrical-only connections and achieved a 12-fold bandwidth-density improvement compared with electrical for the same chip area. In total, 168 VCSELs and 168 photodetectors were used on the traffic manager chip, enabling 1.344 Tb of traffic for transmit and the same for receive. VCSELs in 2007 were at 10 Gb/s, and Compass-EOS chose to operate them at a more relaxed rate of 8 Gb/s.
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Instead, Compass-EOS used its ingenuity to figure out how to couple multiple VCSELs and photodetectors onto the chip. Eight traffic manager chips in total were used on four line cards-all linked in a fully connected optical mesh.Īs lead engineer Kobi Hasharoni put it, there was no backplane, which is why the Compass-EOS routers were so much more compact than those of its competitors.Īt the time of the design, Compass-EOS did not consider using silicon photonics, which was deemed too immature. Instead of the traffic manager going via the router’s electrical backplane to a traffic manager on another card, each optically enabled traffic manager had sufficient bandwidth to connect to all the other traffic managers. As a result, no switch fabric was needed. But it designed its own complex traffic manager ASIC and added a twist by figuring out a way to add optics to the chip. In a conventional IP router, there are also switch fabric chips that send the packets between the cards to the right router output ports.Ĭompass-EOS designed its router between 20 and used a merchant chip for the network processor. The chip implements the queueing protocols and, based on a set of rules, determines which packets have priority on what ports. The traffic manager oversees billions of packets. The network processor does all the packet processing-it takes the packet’s header and uses a lookup routing table to determine its destination and inserts a new updated header frame in the packet. To do this, two chip types are used: a network processor and a traffic manager. It takes IP traffic in the form of packets on its input ports and forwards them to their destination via its output ports. Simply put, a router is a networking platform at the heart of the Internet.
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However, despite the novel chip, the company ultimately failed commercially, largely because its software team of 60 engineers could not compete with its much larger IP core router rivals. It developed a way to integrate optics with its complex traffic manager chip design, resulting in a simpler and lower-power optically enabled core router platform. The ambitious Israeli start-up developed an IP core router to compete with the likes of Cisco Systems, Juniper Networks, Alcatel-Lucent (now Nokia), and Chinese giant Huawei. The company, which later became Compass Networks, provides a valuable case study from a technology and commercial perspective.
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It allows developers to choose from three different load-balancing strategies: Performance, Round-Robin, and Failover.Ĭurrently, the two services are still in beta phase and are available for free only by invitation.ĭaryl Inniss, Roy Rubenstein, in Silicon Photonics, 2017 7.4.3 Compass-EOS: Copackaging Optics and SiliconĬompass-EOS was arguably the first company to offer optics copackaged with a complex chip.
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Windows Azure Traffic Manager provides load-balancing features for services listening to the HTTP or HTTPS ports and hosted on multiple roles. This service is particularly useful in the case of VM roles, where machines hosted in the Azure Cloud become part of the private network of the enterprise and can be managed with the same tools used in the private premises. Windows Azure Connect allows easy setup of IP-based network connectivity among machines hosted on the private premises and the roles deployed on the Azure Cloud. Networking services for applications are offered under the name Windows Azure Virtual Network, which includes Windows Azure Connect and Windows Azure Traffic Manager.
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Thamarai Selvi, in Mastering Cloud Computing, 2013 Windows Azure virtual network
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