NNI Signalling Test Software Helps Ensure Seamless ATM Network Application Note 
Size: 948 KB
Date: April 2000

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Interconnecting the islands of ATM that exist today in public networks is an important step toward realizing the promise of broadband services. The Network Node Interface (NNI) signalling protocol is the link that makes it possible to interconnect and interwork ATM networks bringing us closer to having a global broadband communications network that seamlessly carries applications for video, frame relay, fast internet access, and even voice.

Procedures and tools for testing NNI signalling protocols will play an important role in ensuring the integrity of NNI links in these seamless ATM networks. Just as importantly, NNI testing will help network operators to record consistent and accurate information for their billing systems, and it will assist network operators in delivering quality of service contracts for their customers.

This application note describes the issues involved in testing NNI signalling, and explains how to use the BSTS to address these testing needs. It covers the following topics:

• Two flavors of NNI create more test issues
• B-ISUP protocol for NNI signalling
• Challenges of B-ISUP implementation
• New software eases NNI protocol implementation
• Running NNI protocol tests
• Verifying signalling procedures
• Testing UNI and NNI interworking