![]() Another test included flood pinging between the servers on either side of the transceivers and measuring the packet loss created by interruptions in the light path. I measured raw TCP throughput at a consistent 920Mbps. For all intents and purposes, the link performed like a gigabit fiber link. I also ran raw TCP and UDP (User Datagram Protocol) throughput tests using wildly different packet and window sizes. Tunable parameters within the DT-130, such as a configurable hold-down timer, can also be used to prevent rapid link flapping.Īfter setup, I pushed billions of packets through the DT-130s. Integrating switching and 802.1q trunking capabilities would remove the need for the separate copper management interface and provide fiber link stabilization. In a layer-3 switching environment, spanning-tree will have similar problems. For example, should OSPF or another routing protocol be running across the link, twitches to the optical link could cause frequent route recalculations and increased load on the routers and switches. This shortcoming means that fluctuating optical links could cause deeper network problems. Until an optical link is achieved, the fiber remains dark. When fiber is run from a switch to a transceiver and the transceiver is powered on, no link is established. One unfortunate facet of the DT-130s is its layer-1 characteristics. The farther away the other transceiver, the better the tracking works. I also found that active tracking works well when the motion is smooth and steady rough motion will cause link failure. In practice, I found operation to be quite binary: either there is a link, or there isn’t signal strength does not necessarily affect throughput. Using their integrated scopes, I was able to quickly aim each unit and establish a link between them. In the lab, I set up the DT-130s about 30 feet apart, running from the SC-SX multimode fiber port of each transceiver to a single layer-3 switch. The DT-130s also boast active tracking that can sustain a link even if the transceivers move slightly, such as when mounted atop two swaying skyscrapers. Using free space optics, a pair of Canobeam DT-130 transceivers is able to securely pump data via a beam of light at gigabit speeds across distances of as far as 0.75 miles. ![]() Canon’s Canobeam optical transceivers take the RF out of wireless networking, overcoming many of Wi-Fi’s limitations. Then again, distance, bandwidth, or security requirements may rule out Wi-Fi. ![]() Aecon is pleased to be consistently recognized as one of the Best Employers in Canada.In places where fiber can’t reach, whether due to physical or economical constraints, you might resort to an 802.11a, b, or g link. is a Canadian leader in construction and infrastructure development providing integrated turnkey services to private and public sector clients. “We look forward to working with our partner Dufferin Construction, the Region of York and Metrolinx to deliver a sustainable transportation network.”Īecon Group Inc. “This contract highlights the unmatched multi-disciplinary expertise Aecon brings to the table,” said Teri McKibbon, Aecon’s President & Chief Operating Officer. Work will commence in the second quarter of 2014 and is expected to be complete in the fourth quarter of 2018. ![]() The scope of the project includes widening Yonge Street to accommodate approximately nine kilometres of dedicated rapidway lanes for Viva rapid transit vehicles in the centre of the road, as well as ten new vivastations. (TSX: ARE) advised today that the Region of York has announced that York RapidLINK Constructors, a 50/50 joint venture comprised of Aecon and Dufferin Construction Company, a division of Holcim (Canada) Inc., has been chosen for a $261 million project to design and build the York Viva Bus Rapid Transit (vivaNext) rapidways along Yonge Street in the Towns of Richmond Hill and Newmarket. Toronto, Ontario – April 22, 2014: Aecon Group Inc.
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