彥成通信所獨家代理的 Spirent Communication 有鑑於寬頻網路科技的日異更新，其中ADSL網路普及應用的相關課題，更是眾所注目的焦點，而最新的ADSL2++更是讓現有的ADSL頻寬提升至4.4MHz，下載資料速率可高達每秒52M Bits，Spirent DLS提供您DLS410系列的 Loop Simulator和DLS 5200系列的 Noise Generator等ITU-T所公認的標準測試平臺，再加上Spirent SmartBits提供您 Traffic Generator，讓您在開發ADSL2++的相關網路產品上有了最佳完善的測試環境。

The lucrative revenue opportunities associated with new services such as Video over DSL and other triple play (voice, data, video) services are driving service providers to achieve higher data rates within their large installed base of ADSL equipment. The most promising technology on the horizon to support these higher data rates is ADSL2+ (aka ADSL+). ADSL2+ effectively doubles the downstream bandwidth available for services while co-existing with ADSL, thereby minimizing replacement of existing equipment.

As the xDSL industry gears up to implement and support new equipment and services based on ADSL2++ technology, Spirent Access Emulation (AE) is playing a leading role in the industry and in the standards bodies in building consensus towards the full definition of the appropriate test loops, cable models and noise models. As the ADSL2++ testing standards evolve, Spirent AE will be ready to support existing and new customers with the ADSL2++ testing solutions they need.

As each geographic market has its own specific requirements, Spirent has focused on providing solutions for each market according to its needs and schedule. Spirent’s family of ADSL2++ products began with the successful DLS 410J and DLS 5200JPA systems for Japan. These systems are now widely deployed and accepted as the NTT benchmark testing solution for ADSL2++ in Japan. These are now joined by ADSL2++ testing solutions for North America(DLS 410A and DLS 5200AP) and for Europe(DLS 410E and DLS 5200EP). Spirent’s ADSL2++ family of testing solutions will offer a bandwidth of DC to 4.5MHz to ensure that all known ADSL/ADSL2/ADSL2+/ADSL2++ options from the standards are supported.

ADSL2++ Performance/Reach Testing

Spirent presents the first performance/reach ADSL2++ laboratory testing solutions for the North American and European markets, consisting of the DLS 414 Series of straight loop simulators and the DLS 5200R Noise Generation System, which can be combined with the Spirent SMB 200/2000 Traffic Generator/Analyzer. This solution, which builds on proven high accuracy and realistic cable simulation technology from the Spirent ADSL TR-048 interoperability test solution and the DLS 410 Series ADSL2++ high accuracy technology, provides a seamless Layer 1 test platform for all ADSL options.

The reach testing solution enables integrated circuit manufacturers, network equipment manufacturers and service providers to determine the performance of integrated ADSL/ADSL2/ADSL2+/ADSL2++ style IC/modem/DSLAM products. Spirent’s customers worldwide have used the DLS 90 ADSL bandwidth simulator extensively to determine the performance of their product. The DLS 414 is the next generation DLS 90 with a wide bandwidth, and long reach suitable for ADSL2++.

The DLS 414 allows customers to test new ADSL2++ products prior to formal ITU-T access network conformance testing with the industry standard DLS 410. The DLS 414 system is upgradeable in a variety of flexible options to a DLS 410A or DLS 410E conformance system.

DLS 414A North American 26AWG straight loop simulator
DLS 414E European 0.4mm straight loop simulator

ADSL2++ Standards Conformance Testing

Spirent also presents the first ADSL2++ standards conformance laboratory testing solutions for the North American and European markets. These are:

DLS A2PA North American ADSL2++ Testing Solution, consisting of; DLS 410A North American ADSL2++ Wireline Simulator, and the DLS 5200AP North American ADSL2++ Noise Generation Package This comprehensive system supports testing of TR-048 standard loop requirements as defined by the DSL Forum’s TR-048 ADSL Interoperability Specification. In addition, for G.992.5 (g.adslplus) the DLS 410A will support loops modified to enable optimum evaluation of ADSL2++ technology. These loops have been proposed to the ITU-T as the standard test loops for G.992.5 Annex F (reference ITU-T contribution DC-048R2, Durango Colorado 14-18 April 2003).

DLS A2PE European ADSL2++ Testing Solution, consisting of; DLS 410E European ADSL2++ Wireline Simulator, and the DLS 5200EP European ADSL2++ Noise Generation Package It is anticipated that this system will be based upon loops defined by the ETSI specification TS 101 388, and/or modifications of these loops. Spirent is actively involved in helping to build consensus towards standardization of ADSL2++ test loops for Europe.

Evolution Paths for ADSL2++ Testing Solutions for North America & Europe

Spirent understands the importance of providing our customers with an evolution path that permits migration to new technologies and provides protection of their test system investment. For customers with existing DLS 400 based testing platforms, evolution paths are available to meet a variety of requirements. These are illustrated below:

Upgrade paths to DLS 410A and DLS 410E:
DLS HN-410A Upgrade DLS 400HN to DLS 410A
DLS IA-410A Upgrade DLS 400IA to DLS 410A
DLS IAE-410A Upgrade DLS 400IAE to DLS 410A
DLS 414A-410A Upgrade DLS 414A to DLS 410A
DLS 414E-410E Upgrade DLS 414E to DLS 410E
DLS E3-410E Upgrade DLS 400E3 to DLS 410E

The DLS 5200R/5200AP/5200EP Noise Generation Systems

There are many important reasons to choose one of the pre packaged DLS 5200R/5200AP/5200EP Noise Generation Systems:

●One stop shopping from the industry leader in wireline simulation – part of a complete, integrated testing solution
●Ability to create custom noise files in either the frequency domain or time domain
●Availability of pre-packaged noise files to meet standards requirements
●16 M memory per channel ensuring that noise samples have crest factor of 5 or greater

The DLS 5200R Reach Noise Generation System provides everything needed to complete the reach/performance testing solution. The DLS 5200AP and DLS 5200EP Noise Generation Systems for North America and Europe, provide all the equipment, features and noise files that are required for the full standards conformance testing solutions. Spirent is actively working with the standards bodies to collaborate in the definition of appropriate noise models for both North America and Europe.