BridgeTech VB20 User Manual page 252

and MLR value measured for the missing packet.
Identifying UDP Packet Loss
This discussion does not apply to streams with TS/RTP mapping since in that case
identifying UDP packet loss is straight forward.
There is no fail-safe way to distinguish packet loss caused by dropping UDP packets
from packet loss caused by dropping packets inside the TS layer. IP based networks
will generally not introduce new errors in the TS layer. As soon as the TS layer is
wrapped inside UDP packets all further processing operates on the UDP packets.
The pink line indicates a packet loss of 1-4 with no jitter component.
As a rule of thumb, the co-existence of small MLR readings (1-4) and no IAT readings
can be assumed to have been caused by packet loss in the original TS data.
The pink line indicates a packet loss of 6 or 7 and a doubling of the jitter component.
A UDP packet-drop will usually show up in the MLR value as a multiple of the mapping
value; for a mapping value of 7 TS packets into each UDP packet, the MLR component
will be equal to 7, 14, 21 etc.
Slightly lower values such as 6, 13, and 20 can be expected if a missing UDP packet
did contain one TS packet without continuity counter (i.e. a PCR packet with no
payload).
PROBE USERS' MANUAL VERSION 5.0
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