博文

目前显示的是 六月, 2016的博文

What Will Affect the Longevity of Your Fiber Network?

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When deploying a fiber network, people nowadays not only appreciate the high-speed broadband services, but the maintenance of how long it will last. After all, optical fiber is a particular type of hair-thin glass with a typical tensile strength that is less than half that of copper. Even though the fiber looks fragile and brittle, but if correctly processed, tested and used, it has proven to be immensely durable. With this in mind, there are essentially factors that will affect the longevity of your fiber network. Installation Strains Stress, on the other hand, is a major enemy of fiber longevity, so the protection task is passed to the cable installer, who will ensure that the use of suitable strength elements limits the stress applied to the cable to much less than the 1 per cent proof test level. The installer then needs to ensure that the deployment process does not overstrain the cable. Figure 2 below illustrates a typical crew deployment for a trunk installation. The whole proc…

Why Is Polarity Management Vital in Ribbon Cable Designs?

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Recently Local area network (LAN) campus, enterprises backbones and data centers are upgrading to higher-density fiber counts to meet system bandwidth needs. Therefore, instead of loose tube and tight-buffered cables, network designers are turning to ribbon cables because of its ability to meet the design criteria of high connectivity density relative to cable diameter. However, ribbon cables require unique polarity designs to ensure reliable system performance as well as support ease of installation, maintenance and reconfiguration. In fact, there are three common polarity design methods, namely Method A, Method B and Method C. In today’s article, we will shed light on these three polarity standards and its impact on ribbon cable designs. Ribbon Optical Cable Design As noted before, ribbon optical cable has been regarded as the primary cable design choice for deployment in campus, building and data center backbone applications. The ribbon optical cable design offers robust performanc…

For 1 GbE and 10 GbE Infrastructure : Copper or Fiber Cabling Solutions

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From 1GbE to 10GbE, and eventually up to 100GbE, Etherent technology has developed itself to better meet the increasingly needs of higher-bandwidth. In the meanwhile, higher Ethernet network also requires technological evolution on data carrying techniques. Fiber or copper cabling are the two common cabling standards, providing greater bandwidth for transporting data over Ethernet architectures. Today’s article will highlights these two cabling solutions for 1 Gigabit Ethernet and 10 Gigabit Ethernet application. 1 GIgabit Ethernet Cabling Both fiber and copper cable connections are available for 1GbE application. But which one is more suitable for 1G Ethernet infrastructure? 1GbE Fiber Cabling Compared with copper cabling, the most obvious advantages of fiber cabling are long-reach and high performance. Optical fiber connection for 1GbE connectivity is typically constructed with optical transceivers that receives digital signals from the Ethernet device (switch or adapter card) and co…

End User’s Guide to Fiber Optics

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Subscribers are often complaint about not finding any information about fiber optics aimed specifically at them. Because most materials about fiber optics is written to train optical technicians, people who have no experience in telecommunication can not understand these industry standards. So they have to ask an optical technician for help every time they met a problem or even a tiny error. Today’s article has provided detailed information so that end users can find answers to their questions on fiber optics. What Is Fiber Optics? Fiber optics is the primary the medium we use to communicate today. For instance, Phones, landline or wireless, the Internet and cable TV all communicate on fiber optic cables. Fiber optics carries signals as pulses of light while copper cables carry signals as pulses of electrons. Fiber's advantages over copper result from the physics of transmitting with photons instead of electrons. In glass, optical attenuation is much less than the attenuation of e…

Next Innovation – 25G Ethernet

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The traditional migration path from 10G to 40/100G is widely acknowledged by network installer. People are turning to upgrade to 40G using QSFP+ transceiver. However, migrating from 10G to 40G is a big jump, optical technicians wonder if there is a better solution to replace the existing 10GbE-40GbE-100GbE path. Under this circumstance, a new migration path 10GbE-25GbE-100GbE is given birth. What is 25GbE? Why should subscribers choose to migrate to 25GbE instead of 40GbE? Today’s article will provide some detailed information about this new Ethernet to help you figure out the best migration path to 100GbE. What Is 25 Gigabit Ethernet? 25 Gigabit Ethernet or 25GbE, is a proposed standard for Ethernet connectivity that will benefit cloud and enterprise data center environments. This specification recommends a single-lane 25 GbE and dual-lane 50 GbE link protocols. 25 GbE leverages technology defined for 100 Gigabit Ethernet implemented as four 25 Gbit/s lanes (IEEE 802.3bj) running on …

40GBASE-SR4 QSFP+ Transceivers – 720187-B21 and QFX-QSFP-40G-ESR4 Illustration

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The Ethernet standard relied on duplex fiber cabling with each channel using one fiber to transmit and the other to receive. But for the 802.3ab standard, parallel optics are required to transmit and receive signals. For instance, there are eight fibers associated with the channel—four for Tx signal and four for Rx signal, each transmitting at 10Gbqs for an aggregate bandwidth of 40Gbqs. For 40G interconnection infrastructure, there are 40GBASE-SR4, 40GBASE-CSR4 and 40GBASE-ESR4 QSFP+ transceivers. Today’s article will highlight some practical solutions to the cabling connectivity for 40G short-reach transceivers. 40G Short-Reach Transceivers As noted before, 40G optical transceivers typically use four 10G channels to transmit and four 10G channels to receive over one 12-fiber assembly providing 40Gbqs bandwidth, the middle four fibers remain unused, or dark. Each fiber either transmits (Tx) or receives (Rx) 10G traffic at a single wavelength. Compared with other 40G transceivers, 40G…

Introduction to Fiber Optic Pigtails

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A smooth connection between cable and other optical devices allows the optical signals to pass with low attenuation and little return loss, which is vital for telecommunication network. Fiber optic pigtails, compared with the regular fiber jumper, is terminated with fiber optic connector at only one side of the cable, which are usually used with fiber optic management equipment like ODF, splice closures and cross cabinets. Today’s article will provide some detailed information about fiber optic pigtails. What Is Fiber Optic Pigtail? Fiber optic pigtail is also called bare fiber. It is a kind of optical cable terminated with fiber optic connectors at one side of the cable while leave the other side no connectors, so that the connector side can link to the equipment (eg. fiber converter or optical transceiver module) and the other side can be melted with optical fiber. In fact, fiber optic pigtail and patch cord are similar in structure, fiber optic patch cable is composed of a fiber op…