# IF RX_LOCK is expected AND neither DST reports Data Valid
# THEN return UNEXPECTED_RX_LOSS = TRUE
# ELSE return UNEXPECTED_RX_LOSS = FALSE
#
if (NMAXU004.raw == 1) land (NDSD0051.raw == 0 land NDSD1051.raw == 0) then
    return (1); #TRUE
else
    return (0); #FALSE
endif;