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目前显示的是 十月, 2016的博文

Guide to QSFP28 Transceivers for 100G Data Center Connectivity

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Using standard transceivers and cables is the most straightforward way to upgrade to 100G traffic. However, there are several types of 100G optics (transceivers and cables) available on the market like the CFP, CFP2, CFP4 and QSFP28 fiber optic assemblies. QSFP28 transceivers offer the cost-optimized solutions for connecting 100G switches together in a rack or data center, which become very popular in the 100G connectivity. Today, we are going to introduce this smallest 100G form factor transceiver—QSFP28 to you. QSFP28 Optical Transceivers It is notable that QSFP28 transceiver not only have the same physical size as the QSFP+ used for 40G traffic, but the lowest power consumption among those that are capable of handling 100G traffic. The QSFP28 interconnect offers four channels of high-speed differential signals with data rates ranging from 25 Gbps up to potentially 40 Gbps, and will meet 100 Gbps Ethernet and 100 Gbps 4X InfiniBand Enhanced Data Rate (EDR) requirements. There are ba…

Whether to Choose 40G DAC or AOC Cables

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With the top trend for data center and enterprises to move to higher data rate like 40G, relevant products and technologies are developed to back this new speed (e.g. the 40G optical transceivers and cables). However, there are so many options out there on the market. Network users usually don’t know how to make a choice. Take the 40G cables as an example, the most commonly used 40G cables are the 40G direct attached cable (DAC) and active optical cable (AOC). Each has its unique specification and usage. Which would be the most suitable one for connecting signals across the rack in data center? This article will provide you an ideal answer from the aspect of cabling performance, transmission distance and cost. Brief Overview of DAC and AOC Cables QSFP DAC cable is a form of high-speed cable with “transceivers” on either end used to connect 40Gbqs switches to routers or servers. QSFP+ DAC cable usually comes in either active or passive versions. They are widely available for short-reac…

Guide to Several Materials in Fiber Optic Cable Construction

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Fiber optic cable is considered as one of the most effective transmission medium today for safe, and long-reach communications, and it also offers a number of advantages over copper. In general, fiber optic cable consists of a core, cladding, coating, strengthening fibers, and a cable jacket, which has been clearly introduced in the previous article. Today’s article will focus on the several materials in fiber optic cable construction, as well as their features and applications. PVC (Polyvinyl Chloride) Polyvinyl Chloride (PVC) is one of the most commonly used thermoplastic polymers in the world. The PVC cable is typically used for patch connections in the data center, wiring closet, and at the desktop. PVC is produced in two general forms, first as a rigid or unplasticized polymer (RPVC or uPVC). The following image shows a ST single-mode pre-Terminated cable (0.9mm PVC Jacket). Features: Good resistance to environmental effects. Some formulations are rated for -55 to +55.Good flame re…

Pre-terminated Trunk Cable and MTP Cassette Overview

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Per-terminated cabling is a popular type of termination method that has been used by the overall network designers. It provides an plug-and-play solution for links between switches, servers, patch panels, and zone distribution areas in the data center. Compared to the Fusion splicing, pre-terminated cabling is apparently more suitable to meet the high-bandwidth, high-density network needs. An article entitled “Understanding Pre-Terminated Cabling and Network Deployment” offers some detailed information about the pre-terminated cabling and its advantages. This article will go further to talk about the elements of the pre-terminated cabling including the pre-terminated trunk cables, and plug and play cassettes. Pre-terminated Trunk Cables Pre-terminated trunking cable assemblies provide an easily installed and cost effective alternative to individual field-terminated channels. There are basically pre-terminated fiber cabling and pre-terminated copper cabling, which will be ntroduced in …

100G Direct and Breakout Cabling Solutions

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With the emerging high-speed network standards and rapidly advancing technology, fiber optic network is driven to meet the growing demand for faster access to larger volumes of data. Although 10G/40G Ethernet becomes the mainstream of telecommunication market nowadays, organizations of all sizes still need to be prepared to integrate speeds of 100G and beyond. For data center networking, users can choose different solutions based on the different transmission distance need. In general, there are two kinds of 100G fiber optic solutions: direct cabling and breakout cabling. It is essential for users to understand the detailed information of each type of solution in order to select the one that meets their current and future connectivity needs. How 100G Optics Develop After the IEEE completing the certification of the first 100G standard for Ethernet networks, the transceiver industry launched a new type of form factors for 100G connectivity—CFP ("C" for 100, and FP for Form fa…

QSFP28 100GBASE-LR4 and 100GBASE-SR4 Optical Modules Overview

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Without denying that the market for 100G data center optics is accelerating, and more and more telecommunication vendors are aiming to seize this opportunity to launch cost-effective 100G solutions. FS.COM also offers a series of 100G optical modules and cabling solutions that are compliant to the IEEE standards. Our 100G optical modules support different transmission distance from 100m, 10km and more reach options in CFP and QSFP28 form factors. Before introducing the FS.COM 100G optical modules, let’s firstly talk about the 100 Gigabit Ethernet standard. IEEE 100GbE Standard Introduction Defined by the IEEE 802.3ba-2010 standard, 100 Gigabit Ethernet (100GbE) technology was given birth to transmit Ethernet frames at the rates of 100 gigabits per second. The 100G optical modules are not standardized by any official standards body but are in multi-source agreements (MSAs). The major 100Gigabit Ethernet 100GBASE-R optical module standards are briefly listed in the below table. Accordin…

Introduction to QSFP to SFP+ Cables

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The present 10G network infrastructure has absolutely no more capacity from which we can grow. They just need to scale it up by using 40-Gigabit Ethernet QSFP+ equipped devices and with further scalability options in the near future. But most people may run into an awkward situation that they are out of money to upgrade all of the 10G hardware. Thus owing to the price perspective, some users still stay at 10G Ethernet network. QSFP+ to SFP+ cables or QSFP+ to 4SFP+ fanout cables are introduced to offer a highly cost-effective way to establish a 40G links, which is sure to be a great news to them. QSFP+ to SFP+ direct attached cables (DAC), as an essential component to support 40G connectivity, will be introduced in this passage. QSFP+ Cables Despite the fact that there are several QSFP+ cables available for sale, the optical QSFP+ DAC cables are sure to be the best of them. In general, QSFP+ DAC cables are marked as the most cost-effective cables used inside a short distance for 40G d…

Introduction to Several Cable Types

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Fiber optic cable usually works as the bridge of two devices for both new cabling installations and upgrades, including backbone, horizontal, and even desktop applications. This is how it works, the conventional electrical data signals are converted into a modulated light beam, then transported via a very small diameter glass or plastic fiber to a receiver that converts the light back into electrical signals. The fiber optic links can provide much higher bandwidth and performances than copper links do, making it an ideal choice for many high rate systems that require the transfer of large, bandwidth-consuming data flies over long distance. However, there are several different types of cables available on the market. Here is what you should know about them. Fiber Optic Cable Types Usually fiber optic cables contain several fiber, a strong central strength member, and one or more metal sheaths for mechanical protection. According to different standard, there are different types of fiber…

250um Loose-tube vs. 900um Tight Buffered Fiber

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Choosing the right fiber-optic cable has become more challenging than ever. Factors like the advent of new cable designs, suppliers, changes in fiber specifications, and the many claims of cable performance can confuse even the most seasoned network designers. However, the selection of the basic cable design is mostly dependent on the application and installation environment. There are two common styles of fiber optic cable constructions—loose-tube 250um loose-tube and 900um tight buffered fiber, but they are designed for different usage. So how to choose between them? This article may help you sort it out. Construction of 250um Loose-Tube and 900um Tight Buffered Fiber These two fibers begin with the same 250um bare fiber that features the same size fiber core (like 50um or 62.5um for MM fiber patch cords), 125um cladding and soft 250um coating. However, their main differences lie in the cable construction. As you can see in the following image, a 250um bare fiber or 250um loose tube…