Schedule 66 627 12 - Telecommunication Line Testers And Analyzers - Equipment specialized for describing general line/network condition in terms of analog parameters (attenuation, distortion, etc.) and in terms of switching and digital modulation/demodulation parameters (jitters, delay, etc.). Examples of such equipment include microwave telephone system transmission test sets, telecommunication test equipment such as breakout boxes; modem and fax testers and digital circuit encoding/decoding test equipment, cable/line performance test equipment such as cable fault locators, time domain reflectometer TDR's, subscriber line analyzers, loop responders, and talk sets; trunk line performance test equipment such as trunk responders and line simulators/emulators, and transmission impairment measurement sets (TIMS), etc. Includes modulation/demodulation equipment.