Signed ASTP CDD test cover

This cover was issued and cancelled to mark the successful completion of the CDD test on Apollo-Soyuz.

The Configuration Data Display (CDD) is an interactive, graphical display designed to enable the test engineer to view data in near "real time" as a test is being conducted. The CDD displays data collected from the Advanced Satellite Communications Laboratory test bed. This sophisticated communications satellite simulation test bed produces data on source-to-destination connectivity and bit-error-rate measurements.

It has been signed by William Schick.