The TAS Series II is an advanced new Telephone Network Emulator from Spirent Communications. The TAS Series II provides new high-end solutions for development, testing, and evaluation of modems, fax machines, voice/data terminals, transmission test sets, and other voice bandwidth data communications devices. The TAS Series II offers complete bi-directional impairments simulation (Figure 1-1), The TAS Series II provides greatly enhanced echo simulation capabilities and the ability to emulate virtually all worldwide central office signaling formats. Because the TAS Series II is compatible with testing standards from EIA, CCITT, 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 Series II is software-compatible with the older TAS 1010 Channel Simulator, thereby protecting your prior investment in test procedures and software. TAS Series II works with the TAS Gemini Dual Terminal Emulator and TASKIT software to provide completely automatic modem testing. TAS Series II test results track with those obtained on the popular TAS 1010 and TAS 100 Series