User guide

ProMPEG FEC Support for IP Streaming
G.3.4.3 Column only Overheads:
Overhead = L + (D * L)
= 1 + 1
(D * L) D
Worst case is 4 rows = (1/4) + 1 = 25%
Best case is 20 rows = (1/20) + 1 = 5%
G.3.4.4 Row and Column Overheads:
Overhead = D + L + (D * L)
(D * L)
Worst case is 4x4 = (4+4+16) / 16 = 50%
Best case is 10x10 = (10+10+100) / 100 = 5%
G.4 Recommendations for use of ProMPEG FEC
G.4.1 Overview
There are no official recommendations within the ProMPEG Code of Practice #3
release 2 regarding which parameters give the best results.
The decision to use Column only mode or Row and Column mode is determined by
the packet loss characteristics of the network and the importance of data integrity
over the network. This information will be different for every network and service
provider, therefore Ericsson cannot offer recommendations in this reference guide.
The following information has been added to help demonstrate the difference in data
protection provided by each FEC scheme.
G.4.2 Column-Only Mode Performance
For every 10 fold improvement in Channel Packet Loss Ratio (PLR) there is about a
100 fold improvement in the outgoing PLR.
G.4.3 Row and Column Mode Performance
For every 10 fold improvement in Channel PLR there is about a 1000 fold
improvement in the outgoing PLR.
2/1553-FGC 101 1014 Uen B
G-5