The TAS 150, 151, 152, 181, and 182 are the latest generation of models in the 100 Series of Telephone Network Emulators from Telecom Analysis Systems (TAS). The Model 150, 151, 152, 181, and 182 are enhanced compatible replacements for the TAS 100, 101, 102, 121, and 122 respectively. The TAS 100 Series provides a convenient solution for development, testing, and evaluation of high speed modems, fax machines, voice/data terminals, transmission test sets, and other voice bandwidth data communications devices. The 100 Series offers either unidirectional or bidirectional impairment simulation including PCM (Figure 1-1) as well as echo simulation capabilities and the ability to emulate virtually all worldwide central office signaling formats. Because the 100 Series is compatible with testing standards from EIA, CCITT, ROT, ETSI, Bell Operating Companies, AT&T, Nippon Telephone and Telegraph, and many other companies and industry organizations, test results have immediate credibility. In addition, the TAS 150, 151, 152, 181, and 182 are software-compatible with the industry standard TAS 100, 101, 102, 121, and 122, thereby protecting your prior investment in test procedures and software. The 100 Series works with the TAS Gemini Dual Terminal Emulator and TASKFF software to provide completely automatic modem testing. The 100 Series test results track with those obtained on the popular TAS 1010 and TAS Series II simulators, so the test results agree with the largest installed base of Telephone Network Simulators in the world.