Cobalt Digital Inc BBG-1090-DEC-MPEG Product Manual page 53

• Received Rate (b/s): indicates the measured rate in bits/second at the input of the
decoder. This does not include FEC bit rate or UDP/IP overhead – it is the transport
stream rate.
• Protocol: indicates the detected protocol, either UDP or RTP.
• Current Source: indicates Primary or Backup.
• Stream Source IP Address: indicates the current IP address from which the stream is
being received.
• Received Packets: indicates the number of packets received since the last time the
statistics were reset.
• Lost Packets: indicates the total number of lost packets since the last time the statistics
were reset. Note that the Decoder can only detect lost packets if the incoming protocol is
RTP. It is not possible to detect lost packets with UDP as it lacks a sequence number.
• Recovered Packets: indicates the total number of packets recovered with RTP/ARQ
since the last time the statistics were reset.
• Unrecovered Packets: indicates the total number of lost packets that could not be
recovered with RTP/ARQ because a retransmission for them was never received.
• NACKs Sent: indicates the number of retransmission requests sent. Note that one
retransmission request can ask for up to 17 packets, and a packet may be requested
multiple times, so this number may be more or less than the number of lost packets.
• Late Packets: indicates the number of packets successfully received, but too late to be
used (after the time they were supposed to be consumed). A non-zero count in this field
indicates that the NACK Window should be increased.
• Duplicate Packets: indicates the number of packets that were received more than once.
Duplicate packets do not create glitches or issues. A count of duplicate packets means
that either there is delay variation in the network or packets are being received out-of-
order.
The counts for Received Packets, Lost Packets, Recovered Packets and Unrecovered Packets can
be reset at any time by clicking on the Reset Network Statistics button in the RTP/ARQ Stream
area of the Decoder Input configuration, also reproduced below:
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