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01/04/2012 - Signals Research Group uses Spirent for Industry's First Independent Data Performance Benchmark Test of Commercial LTE Chipsets


Results highlights LTE's strong data performance potential, as well as issues with today's device implementations

Sunnyvale, California – (January 4, 2011) – Signals Research Group, LLC (SRG) has announced the findings of the industry's first and only independent data performance benchmark test of commercially-available LTE chipsets. Although the SRG report highlighted the ability of some chipsets to realize the promise of LTE's high data rates, large performance differences were found between commercially-available implementations in devices.

Using a lab-based testing approach on the Spirent 8100 solution, SRG collected and analyzed the data performance of five commercial devices from LG, Sierra Wireless, Novatel Wireless, Samsung and Fujitsu, which use chipsets from four different vendors.

"Overall the industry has made tremendous strides in the last few years, with theoretical peak data rates increasing from 3.6Mbps in 2007, when SRG and Spirent first started working together on benchmark testing, to today's 70Mbps in a 10MHz radio channel," said Michael Thelander, CEO, Signals Research Group. "It is also very heartening to see the presence of emerging baseband chipset suppliers who previously did not offer a 3G baseband chipset."

While no single chipset dominated the performance benchmark test, the SRG report concluded that: Some devices exhibit significant problems under certain conditions, lagging the top performers by a high double-digit percentage.

The demands of the much higher throughput requirements in LTE appear to be creating unforeseen performance bottlenecks not exhibited by today's HSPA and HSPA+ chipsets.

Some chipsets misreport the quality of the radio channel, which could result in network resources being allocated to devices unable to make effective use of them, to the detriment of other network users. This recent round of tests marked the sixth time that SRG and Spirent have collaborated on chipset performance testing. For the LTE data performance benchmark test, the Spirent 8100 solution was used to subject all the chipsets to the exact same sets of network conditions, automatically repeating each test multiple times to generate statistically significant, objective results.

The tests measured the downlink throughput and key performance indicators of each chipset at the application layer under a wide range of realistic network conditions. The test scenarios, based on the latest specifications from 3GPP Technical Reports (TRs), included various static conditions as well as industry-standard pedestrian fading and vehicular fading conditions. In total, 28 LTE test scenarios were used.

A complete analysis of the LTE chipset performance benchmark is contained in SRG's latest report, which is published today. For more information please visit www.signalsresearch.com.

For more information on testing LTE chipset and mobile device performance, visit http://www.spirent.com/Devices-and-Equipment/LTE_devices

About Spirent Federal Systems
Spirent Federal Systems was formed in July 2001 by Spirent Communications as a wholly owned subsidiary and United States proxy company. Spirent Federal markets and sells products in North and South America with value-added features and ongoing customer support. Spirent Federal Systems is headquartered in Yorba Linda, California, with support and sales offices throughout the US.

About Spirent's Positioning Technology Division
Spirent is the first choice of major manufacturers, integrators, test facilities and space agencies worldwide for GNSS testing and simulation solutions. Today, Spirent simulation systems are used throughout the world through a broad range of clients in more than 30 countries. Spirent delivers navigation and positioning test equipment and services to all sectors of the navigation and positioning community, from government agencies through to high volume commercial markets.

About Spirent Communications plc
Spirent Communications plc. (LSE: SPT), a global leader in test & measurement, inspires innovation within development labs, networks and IT organizations to enable customers to deploy communications networks, services & applications, and devices that enrich life. Our extensive portfolio of solutions test data centers, high speed Ethernet networks and services, 3G/4G wireless networks and devices, network security, and global navigation satellite systems. With solutions used by more than 1,700 customers in 30 countries, the world’s largest equipment manufacturers, service providers, enterprise and governments rely daily on Spirent to help ensure their success. Based in Sunnyvale, CA, Spirent Communications has 1,300 employees worldwide.

Spirent Communications plc Ordinary shares are traded on the London Stock Exchange (ticker: SPT). The Company operates a Level 1 American Depositary Receipt ("ADR") program with each ADR representing four Spirent Communications plc Ordinary shares. The ADRs trade in the US over-the-counter ("OTC") market under the symbol SPMYY and the CUSIP number is 84856M209. Spirent Communications' sales to the United States government are made through Spirent Federal Systems Inc (www.spirentfederal.com).

Spirent, Spirent Communications and the Spirent logo are trademarks or registered trademarks of Spirent Communications plc. All other trademarks or registered trademarks mentioned herein are held by their respective companies. All rights reserved.

This document may contain forward-looking statements which are made in good faith and are based on current expectations or beliefs, as well as assumptions about future events. You can sometimes, but not always, identify these statements by the use of a date in the future or such words as "will", "anticipate", "estimate", "expect", "project", "intend", "plan", "should", "may", "assume" and other similar words. By their nature, forward-looking statements are inherently predictive and speculative and involve risk and uncertainty because they relate to events and depend on circumstances that will occur in the future. You should not place undue reliance on these forward-looking statements, which are not a guarantee of future performance and are subject to factors that could cause our actual results to differ materially from those expressed or implied by these statements. The Company undertakes no obligation to update any forward-looking statements contained in this document, whether as a result of new information, future events or otherwise.



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