Channel diagnostic apparatus and method.

摘要

Provision is made for conducting an I/O channel diagnostic test by using a first I/O channel in a test mode to provide a sequence of test signals to a second I/O channel. The second I/O channel responds to the test sequence by producing a series of data transfer protocol signals which are conducted to the first channel. In the first channel, the series of data transfer protocol signals are used to check operation of the second channel.