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.
