  This paper presents using bit error rate (BER) measurements to evaluate
operation correctness of traffic (input-output) interfaces in modem of very
small aperture terminal (VSAT). Such functional tests are carried out, for
example, when purchasing communication equipment for armed forces. Generally,
available standards do not describe measurement procedures in this area. In
this case, accredited laboratories should develop dedicated assessment
methodologies. In this paper, we show the methodology for the VSAT modems,
which is based on the BER measurements.
