ISDN-ASPEN-an ISDN performance evaluation tool

To characterize the end-to-end performance of AT&T's ISDN BRI (Integrated Services Digital Network basic rate interface) services, a system called ISDN-ASPEN (Automatic System for Performance Evaluation of the Network) was developed. ISDN-ASPEN is a flexible, automatic data acquisition and analysis system built on the UNIX operating system. This system has the ISDN interface, which provides the capability to measure voice and data services performance at the customer's premises. The performance parameters include postdialing delay, clear configuration delay, customer usages, bit error rate, data transfer delay, and echoplex delay. The ISDN-ASPEN system consists of remote test modules under the control of a centralized host computer. The authors describe the system architecture and capabilities of ISDN-ASPEN and a postdialing delay example is presented.<>