/ MPEG2 (ASI) PRODUCT
primary function of the MDD-4490 is to raise an
alarm if its input MPEG Transport Stream fails.
Its secondary function is to raise an alarm if
the Transport Stream is not the correct stream
as identified by its Stream Id. Thirdly it can
raise an alarm if a particular program number is
missing from the stream and in addition monitors
a number of the parameters of first priority
measurements of ETR290.
There are two relays whose contacts are
available on the rear assembly. They are
labelled Urgent and Non- Urgent. If the
Urgent relay operates then the red URG led
on the front panel will light. If the Non-
Urgent relay operates then the amber led NON
will light. Each of the relays can be
selected (by dip switches) to operate on any
or all of the error states of any of the
seven status LEDs.