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The TAS 4500 FLEX RF Channel Emulator provides a convenient, thorough approach for testing wireless communications equipment by emulating the delay, fast and slow fading, and path loss characteristics of RF mobile communication channels. The 4500 FLEX allows thorough testing in a laboratory setting and drastically reduces the time required for product tests. The 4500 FLEX can be used to test a wide range of wireless voice and data communication equipment, including cellular telephones, cellular modems, personal communication terminals, wireless LANs, pagers, wireless network equipment, and much more. TAS 4500 FLEX provides advanced signal processing features to address a wide range of wireless communications technologies. The 4500 FLEX delivers these features in a modular format, so your test system can evolve to meet your testing needs for years to come. The TAS 4500 FLEX has the following features: • Plug-In RF Front End Modules • Plug-In Local Oscillator Modules • Plug-In Wide Bandwidth Signal Processing Modules • Plug-In System Software PCMCIA Card A single TAS 4500 emulates two independent wide bandwidth RF channels, each with up to six transmission paths, see Figure 1-1. Delay, path loss, Rayleigh fading, and log-normal fading characteristics can be programmed for each path. Two six-path channels can be combined to make one 12-path channel, and two, three, or four TAS 4500s can be combined and synchronized for multi-channel applications.