DS-3 Test Set Consists of a transmitter and receiver set Provides fading measurements and error addition Complies with Bell System DS-3 requirements Measurements include: simultaneous measurement of error seconds, threshold error seconds, error free seconds, threshold error free seconds, total errors, and error rate Simultaneous error detection of bit errors, parity errors and bipolar variations Built-in printer, wide jitter modulation, multiple receiving input levels, and versatile output signals included