Upgrading to 40/100 Gigabit Ethernet? Consider the Implications on your Multimode Fiber Infrastructure

Posted by OJ Johnston on Mon, May 11, 2015 @ 17:05 PM

While many enterprises are considering the move to a 40/100G ethernet infrastructure, often they overlook the impact of remaining with a multimode fiber infrastructure. While there is little difference in the infrastructure requirements of 10G ethernet for single-mode fiber and multimode fiber infrastructures, there is an exponential difference in 40/100G ethernet infrastructures. Many people tout the economics of MMF vs SMF lasers as the key reason for remaining with their MMF infrastructure; however, the savings achieved there will likely be erased by the increased cost of the passive optical infrastructure.

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Topics: network monitoring, single mode optical fiber, multimode optical fiber, 100G, optical taps, network taps, 40G, gigabit ethernet

Optical Switches: Symmetric and Asymmetric

Posted by Kevin Miller on Wed, Feb 5, 2014 @ 16:02 PM

While there are a number of aspects that can be discussed in regards to optical switching technology, the focus of this article is to provide information about two key categories of optical switches – symmetric and asymmetric.  The concept is very straightforward, but still important to understand when determining which type of optical switch will be most suitable for a given application.

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Topics: network monitoring, optical switch, optical switches, optical switching, symmetric optical switches, asymmetric optical switches, non-blocking switch, switchlight

Best Practices for Network Monitoring Traffic Capture

Posted by OJ Johnston on Thu, Dec 20, 2012 @ 18:12 PM

In recent years, companies have shown the benefits of “copying” and sending traffic from network backbones to purpose-built monitoring devices…no interference with the existing, “live” traffic and the traffic can be analyzed in real-time or stored for later playback. However, the best approaches to “copying” and sending the traffic to be monitored has been a source of contention.  As 40/100G becomes more prevalent, how the traffic is accessed will become increasingly important.

Initially, the Switched Port Analyzer (SPAN) ports were used to deliver copies of traffic to analyzers, but this has posed several problems at the 1G and 10G data rates, which likely will increase exponentially with 40/100G:

  • SPAN ports are part of the switch/router and operate in much the same way as typical ports, so the data is not always an exact copy
  • Traffic congestion both on the router and on the SPAN port itself can result in increased latency or the traffic to be dropped completely
  • Relying on a device that could be creating the problem to help identify it can be a self-defeating exercise
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Topics: network monitoring, 100G, network tap, traffic capture, analyzer port, passive optical taps, layer 1 switch, ethernet tap, network traffic analyzer

Remote Fiber Test Systems – Increasing Optical Network Availability

Posted by Kevin Miller on Tue, Aug 14, 2012 @ 10:08 AM

With most of the world now relying on fiber optic systems for communication, a key component to ensuring a high level of performance from operators is network monitoring.  When we think of network monitoring, much of the focus is usually on the equipment itself, as well as the management of all the data flowing through the system.  As a result, an area often overlooked when deploying and monitoring a network is the actual fiber optic cable, through which all the data is sent from one location to another.

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Topics: fiber monitor, optical network, network monitoring, remote fiber test systems, remote fiber test system, rfts, monitor fibers