For example: Agilent E4440A or Anritsu 68369
Communications
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Digitech ISDN 1000 Overview
The Digitech ISDN 1000 is a portable tester which is used to test the "U" and "S/T" interface points of ISDN basic rate (BRI, 2B+D) lines and NT1's. The ISDN 1000 can also be used for testing Northern Telecom P-Phone (EBS--Electronic Business Service) lines and POTS (analog) lines.