1. An apparatus configured to transmit a jitter test pattern over a communications bus to a device under test, the apparatus
a port configured to at least transmit and receive data over the communications bus;
a transmission scrambler in data communication with the port; and
computerized logic in data communication with the port and the transmission scrambler, the logic configured to cause the apparatus
generate one or more jitter test patterns comprising at least one asynchronous packet;
transmit the one or more jitter test patterns to the device under test;
disable the transmission scrambler after synchronization with the device under test has been achieved; and
retransmit the one or more jitter test patterns at least once to the device under test.