During the transition from analog to digital, the typical video facility mu
st support a mixture of both analog and digital video equipment. This mixed
facility requires a combination of analog and digital video performance me
asurement tools to verify proper video image quality, In many cases, tradit
ional analog video performance measurements can be used to infer proper per
formance in a digital video transmission system. This paper summarizes perf
ormance issues in analog, digital, and mixed analog/digital video transmiss
ion systems and discusses methods that can be used to verify proper video p
erformance.