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25 Sep 2016

As is known to all, fiber optic cables are widely deployed in telecommunication networks. It seems that copper cables are out of date. However, copper network is superior to fiber network in some cases as copper cables are stronger and easier to manage than fiber cables. Copper cable also takes the advantage of lower cost than fiber. Besides, copper network is easier to build, which eliminates the process of I/O. Today’s copper cables are able to support data rate of 1G, 10G, 40G and even 100G, among which 10G copper based network is most commonly deployed. Currently, there are two types of standards designed for 10G copper-based network: 10GBASE-CR and 10GBASE-T. Which one is more suitable for you when building a 10G copper based...

01 Aug 2016

Direct attach cable, short for DAC, is a form of high speed cable with “transceivers” on either end. They can be used to connect switches to routers or servers. They are becoming increasingly popular in the network industry and widely applied in storage area network, data center, and high-performance computing connectivity etc. The DAC has the advantage of cost-effectiveness compared with the regular optics. Another reason for its increased popularity is that RJ-45 10G is not widely adopted, and most high density 10G switches are delivered with 48x SFP+ ports in 1 Rack Unit. Here are some basic knowledge you may not know but should know about the DACs.

Cisco SFP-H10GB-CU5M

1. No matter in the related article or in product description of some DACs...

23 May 2016

Parallel-optical data links are now available and designed into many next-generation telecom/datacom central-office switches and routers. In order to meet the continued growing Internet capacity over the next couple of years, parallel-optical data links are gaining more and more popularity. This article will introduce the next-generation parallel optical data links which will play continuing role in the future network of data communications.

What Is Parallel Optical Link

Parallel optical data link is a concept opposite to serial optical data link and also a replacement for many serial data communication links. In the more typical application of parallel optic link, one byte of information is split up into bits. And each bit is coded...

19 Jan 2016

As the speed and transfer rates of computer hardware continue to grow alongside demand for ever-more data, new cabling becomes a necessity to keep up. Backbones for 40G on multimode fiber generally use MPO connectors which work with QSFP+ transceivers to allow four simultaneous 10G or better connections. An upgrade to QSFP+ can mean a significant reduction in overall cabling, which brings better reliability and cost-effectiveness.

MPO can work at higher speeds as well, able to bundle hundreds of individual fiber lines at once into a single terminator. As this is a relatively new standard, MPO connectors are not well-understood by many people. However, they're necessary to deliver the speeds promised by today's top-line...

09 Dec 2015

With the economics-driven growth of fiber communication networks over the past few decades, there is an increasing demand for cables which can provide a lower-power means for operation on short fiber optic links or short copper connections such as the direct attach cables (DAC) that will be described in this article.

What is DAC

A direct attach cable (DAC) is a fixed assembly that is purchased at a given length, with the connector modules permanently attached to each end of the cable. The direct attach cable is designed to use the same port as an optical transceiver, but compared with optical transceivers, the connector modules attached to the DAC leave out the expensive optical lasers and other electronic components, thus achieving...