Network Terminal Equipment,Experimentation with Electronic Selection Equipment -Digital Sequence Detector.

摘要

The report deals with the implementation and evaluation of a digital sequence detector as a replacement for the teletypewriter mechanical 'stunt box'in order to obtain more capacity for addresses and answerback;greater reliability;and easier,faster reprogramming and repair. This device is intended for service A, B,and C,and was found,in adapting and testing one unit at the National Aviation Facilities Experimental Center,to perform equally or better than the model 28automatic send/receive teletypewriter stunt box it replaced,which included normal operation and distortion tests. It also performed satisfactorily for eight-level and for the polarity-reversing voltage,high-impedance operations.