博文

目前显示的是 五月, 2016的博文

Single-mode Fiber Standard and Selection

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Are you turning to deploying single-mode cables to speed up your infrastructure? If yes, let’s say you have made the right choice. In general, single-mode cables are typically categorized into OS1 and OS2 single-mode fibers. Besides this, a variety of SM optical fibers with carefully optimized characteristics are also available in ITU-T G.652, 653, 654, 655, 656 or 657 standard. Each has its unique specification, which reflects the evolution of transmission system technology from the earliest installation of single-mode optical fiber to the present day. Today’s article will make a brief introduction to the G.65x series of single mode fiber patch cables so as to assist you in making a wise selection. G.652—The ITU-T G.652 fiber is the most commonly deployed single-mode fiber. This standard SM fiber comes in four variants (A, B, C, D) see in Figure 2. A and B have a water peak. C and D eliminate the water peak for full spectrum operation. The G.652.A and G.652.B fibers are designed to h…

Introduction to 100G Optics – CFP and QSFP28 Transceivers

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2015 witnessed the prosperity of the telecom market. Many research company predicts that the market of 2016 for telecommunication field will continue to thrive. With such a bright future, fiber optics market attracts a wide attention and many vendors want a piece of the pie. At present, 40G is ubiquitous in the data center and 100G is accelerating. As for the optical transceiver, it has been developed in the past decades to adapt to the high-speed requirement from 1G to 40G even to 100G. Believe it or not, 100G is coming. So, what can we do to make us well-prepared for the upcoming 100G era? How about the 100G optical transceivers? 100G Optical Transceiver Modules There are many form factors of 100G transceivers including CXP, CFP, CFP2, CPAK, CFP4 and QSFP28. Among them, QSFP28 and CFP optical transceiver are the most commonly used 100G transceivers. The following figure shows a comparison between 100G transceivers. CFP Transceiver—CFP transceiver was designed after SFP transceiver in…

10G SFP+ Optics Ensure Smooth Network Performance

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According to a recent IDC report, data center power consumption continues to draw a lot of attention, which accounts for 40% of the operating expenses of a data center and the cost of this power has doubled in the last five years. Additionally, IDC estimates that data center power costs will equal server capital cost. These trends are driving the emphasis towards data center power efficiency. Server virtualization is the key element in the next-generation energy efficient data center. It enables multiple virtual servers to run a single machine, helping companies to consolidate their data center infrastructure into fewer, high-density, high-efficiency facilities. Nowadays in order to support the data storage and retrieval requirements of multiple virtual servers, enterprises are driving the transition of data center interconnect speeds from the current 1 Gbps to 10 Gbps. As 10Gbqs interconnect are ubiquitous in the data center, enterprises are turning to a low-cost, low-power, and spa…

25G Ethernet Q&A

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25G Ethernet, developed by IEEE 802.3 task force P802.3by is a newly proposed standard for Ethernet connectivity. After its appearance, the road to 100G is considered to be 10G→25G→100G. 25G Ethernet may be the quickest path to completion IEEE Ethernet standards effort to 100GbE. To unveil the mask of the mysterious 25G standard, this post offers some answers to help you sort it out. What is 25G Ethernet? Do you mean 25G electrical lanes used for 100G Ethernet? No, it is a proposed standard for Ethernet connectivity that will benefit cloud and enterprise data center environments. 25 GbE leverages technology defined for 100 Gigabit Ethernet implemented as four 25 Gbit/s lanes running on four fibers or copper pairs. Just think of it as 10G Ethernet sped up 2.5 times. Why Choose 25G? The most obvious feature of 25 Gigabit is described in two words—single lane. The phrase refers to the electrical signaling on the chip that would power an Ethernet port, while the design of 40 GbE was based …

10G Fiber Optic Transceivers

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10GbE technology nowadays is becoming more pervasive as enterprises grow their networks and support more bandwidth-intensive application. In the meanwhile, 10GbE functionality can provide immediate performance benefits and safeguard a company’s investment well into the future. The supporting 10G fiber optic transceivers are designed for 10Gbit/s data transmission applications including 10 Gigabit Ethernet, 10 Gbit/s Fiber Channel, Synchronous optical networking. After years of development, there has been various different form factors and optics types introduced—10G XENPAK, 10G X2, 10G XFP and 10G SFP+. This article will have a brief introduction to these 10G optical transceivers. XENPAK XENPAK is the first 10G fiber optic transceiver. It is a highly integrated, serial optical transponder module for high-speed, 10Gbit/s data transmission application. XENPAK modules designed XAUI interface and knowledge shaping (CDR) function, which comply with the XENPAK MSA protocol and satisfy the a…

Three Things To Know The SFP Modules

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SFP optical transceiver is generally regarded as the most useful technological advancements of the telecom industry. This transceiver is less than half the width of the GBICs and created under the Multi-Source Agreement (MSA). SFP transceiver is hot-swappable, which is highly beneficial to network designers. What’s more, the smaller size and high performance enable the enterprises to cost-effectively migrate to Gigabit Ethernet. There are a number of small form pluggable (SFP) optical modules and network accessories to select from. Therefore, to save your troubles, this article elaborates three basic information of SFP transceiver module to make sure you have chosen the right one. The Origin of SFP Optical Module SFP transceiver modules are hot-pluggable module with LC interfaces. SFP can be simply treated as the upgrade version of GBIC. SFP module volume ratio reduced by half, the same panel can be configured in more than double of ports. Other features of SFP Module are generally th…

40G QSFP+ DAC Overview – QFX-QSFP-DAC-3M and QSFP-H40G-CU3M

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Evolution is taking placing every minute in the data center in order to better meet people’s needs, and one of the main changes in the data center is that data center designers want to migrate to 40G or 100G without replacing the existing multimode cabling infrastructure. It is known that every data center requires optical transceivers and Direct Attach Cable (DAC) for interconnect. Recently many vendors supply 40G optical devices including QSFP+ optical transceivers, QSFP+ DAC cables and QSFP+ AOC cables. The QSFP+ DAC cables from Cisco and Juniper are highly favored by overall users. Thus in today’s article, we will pay more attention to the illustration of the 40G QSFP+ DAC cables, especially the Juniper QFX-QSFP-DAC-3M and Cisco QSFP-H40G-CU3M. 40G QSFP+ to QSFP+ Direct Attach Copper Cable QSFP+ to QSFP+ direct attach copper cable offers a highly cost-effective way to establish a 40G link between QSFP+ ports of QSFP+ switches within racks and across adjacent racks, which is very s…

Why the Fiber Optic Technology Is Better Than Copper?

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There is no denying that people may encounter a dilemma when accessing which type of network cable (fiber or copper) to install, and which type you should go with. As technology develops further and supporting devices catch up, fiber optic technology is becoming more and more popular. As we know, the most obvious difference between the fiber optic network and copper network is the speed of transmitting data. Associate Professor Robert Malaney has said, “When we are talking about 'speed', we were actually talking about throughput (or capacity)—the amount of data you can transfer per unit time.” Of course, fiber optic cable can definitely transfer more data at higher speed over longer distances than copper cable. So here comes the question: why is the fiber optic technology better than copper? How Do They Work? To solve this problem, first we should get down to the working principles of them. Copper network works by sending electrical pulses through a copper wire. The power of t…