Network LatencyNetwork latency is measured by the time it takes for information to travel from one point to another, and efforts to reduce it have been going on since humans first started communicating.

A brilliant example of this was seen in the early days of the telegraph, when news between North America and Europe still had to travel by boat before being re-transmitted over land-based telegraph lines. A few enterprising telegraph companies started setting up stations on the southwest coast of Ireland to intercept United Kingdom-bound ships carrying news from the US. They would re-transmit the news and, in doing so, reduce network latency by several hours or days. The completion of the transoceanic telegraphic lines helped put an end to using ships to transport telegraphs, and further reduced the latency between the continents by days.

Network latency is even more critical in today’s information age, where delay is often measured in milliseconds (or microseconds, in the case of financial markets) rather than days. The relentless move towards Internet-based business, and the expectation that the network response time will be close to instantaneous, has meant that networks must be engineered to minimize delay.

Some enterprises have made a direct correlation between delay and revenue impact. Amazon famously claimed that every 100 milli-second reduction in delay led to a one percent increase in sales. Google also stated that for every half second delay, it saw a 20 percent reduction in traffic on its site.

Excess latency can have a profound effect on user experience—from excess delay during a simple phone conversation, to slow-loading webpages and delays with streaming video. Ask any on-line gamer how delay or lag impacts his or her experience.

There are plenty of examples that quantify the results of excess delay, and there are plenty of tools available to measure latency; however, the real challenge lies in isolating and correcting the actual cause of the delay. New technologies such as virtualization and cloud computing make much better use of existing assets, but they also add unintended layers of complexity and make troubleshooting more challenging.

Fortunately, there are tools available to help address these issues. Solutions such as applications performance monitoring or infrastructure performance monitoring tools are available to monitor applications and ensure that security, availability and performance objectives are met.

One of the key requirements these tools must meet is to monitor the bitstream without affecting its performance or availability without excessive additional cost. Schemes such as port mirroring are costly and reduce switch resources.

One key enabling technology in the monitoring application is the fiber traffic access point (TAP) module. This completely passive device splits the incoming signal and sends one copy to the monitoring equipment and the other copy to the IT equipment. A well designed TAP should be fully integrated into the fiber infrastructure, and the links engineered such that they can accommodate the TAP while ensuring link performance.

As history has shown, reducing latency is an ongoing challenge. For many industries, having the lowest latency network will provide a distinct competitive advantage. Engineering networks to provide low latency and putting the tools in place to monitor and isolate sources of delay can have a great impact on a company’s success.

We have come a long way since the transoceanic telegraph, but we still fight latency issues on several levels.  The fiber TAP is the latest tool to help cut down on this costly issue. If you have any questions about the fiber TAP solution or other network latency solutions, please leave a comment below and I will be sure to respond.

About the Author

Dave Tanis

David Tanis is the Director of Strategic Enterprise Marketing at CommScope. Dave joined the team in April, 2005 and has overall responsibility for driving solutions and product marketing for enterprise customers throughout North America. Dave has over 20 years experience in the telecommunications industry. He joined AT&T Network Systems in 1984 as Product Engineer and held a number of positions in their manufacturing facility in North Andover, MA, USA. He joined Lucent Technologies in 1996 and assumed the role of EMEA Technical Manager for Optical Fiber and Cable in 1998. With the acquisition of the Lucent Optical Fiber and Cable business by Furukawa and CommScope in 2001, Dave assumed the role of EMEA Technical Director, OFS. Dave continued in this role for OFS until April 2005, when he joined SYSTIMAX Solutions as EMEA Technical Director. Dave has published several papers in various industry trade journals and is a regular presenter at industry conferences. He holds a Bachelors Degree in Mechanical Engineering from the University of Vermont and a Masters in Business Administration from Boston University in the USA.

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