RANGE RIDER

APPARATUS FOR USE IN DATA TRANSMISSION SYSTEMS-NAMELY, FULL DUPLEX TESTING ADAPTER, DATA INTERFACE PANEL, PSEUDO-NOISE TRANSMISSION TEST SET, MODEM TEST SET, ERROR RATE ANALYZER, PROGRAMMABLE DIGITAL PRINTER, DATA TEST SET PRINTER, INTERFACE MONITOR AND BREAKOUT PANEL, ERROR BIT ANALYZER AND MULTICHANNEL BIT ERROR RATE MONITOR SYSTEM