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Also Branded as JDSU / Acterna and TTC
ISDN Primary Rate Test Set The Leader in Portable ISDN Testing The first portable test set to support Primary Rate Interface ISDN, TTC s TPI 570 has now become the industry standard in Primary (PRI) and Basic Rate (BRI) ISDN testing. Most major ISDN service providers, including all versatility and power. A full-featured, multi-functional test set, the TPI 570 supports all U.S. call controls, including national ISDN, and allows considerable flexibility in turning-up and troubleshooting present and future PRI and BRI ISDN services.