Error and Jitter Test Set for error measurements and jitter generation up to 175 Mbit/s. Error measurements at all bit rates from 48 kbit/s to 175 Mbit/s Automatic measurement of mean tolerance to jitter at all bit rates from 48 kbit/s to 175 Mbit/s with jitter generator option Error measurements in one timeslot of a 2/8/34/139 Mbit/s framed signal with frame processor option.