
Web GUI Control
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If the user does not have a license to use FEC then the available IP Encapsulation
options become UDP, RTP, RTP/FEC Column (No License) and RTP/FEC Column
and Row (No License). If either of the ‘(No License)’ options is selected then IP
Encapsulation will be set to RTP and FEC will not be enabled. If subsequently the
license is enabled for FEC then the ‘(No License)’ suffix will be removed from the
displayed valued of IP Encapsulation
Constraints on FEC Parameters
To promote interoperability and simplify implementation, limits are specified for
values of the
L
(number of columns) and
D
(number of rows) parameters. ProMPEG
FEC requires equipment manufacturers to support all combinations of values of
L
and
D
within these limits. The specified limits are:
Columns Only: (
L x D
<= 100) and (1 <=
L
<= 20) and (4 <=
D
<= 20)
Rows and Columns: (
L x D
<= 100) and (4 <=
L
<= 20) and (4 <=
D
<= 20)
Background
Forward Error Correction or FEC, enables packets lost during transmission over IP
networks to be recovered by adding extra information to the transmitted data. The
particular type of FEC used on the unit is that specified by SMPTE 2022 1/2.
The key features of ProMPEG FEC are:
•
Open standard FEC scheme.
•
Increased robustness of transmission.
•
Increases network reach through FEC on high loss links.
•
Highly configurable depending on bandwidth vs. robustness.
•
FEC transmitted separately to media stream.
•
Independent of video compression standard (MPEG-2, MPEG-4).
ProMPEG FEC can help to solve the problems caused by missing packets. It is an
open standard for protection of contribution broadcast real-time transmissions over
IP networks by facilitating real-time lost packet recovery at the receive units. It
permits flexible configurations for optimization requirements.
The scheme uses an RTP layer which adds timing information for sequence
correction. FEC packets are transmitted in separate IP packets. The FEC packets
are calculated by arranging the media packets into a matrix. The matrix size defined
by columns (L) and rows (D).FEC packets are calculated along columns and rows
using the XOR function. FEC can be 1D (Column Only) or 2D (Column and Row).
Summary of Contents for AVP 4000
Page 1: ...AVP Family AVP 4000 Software Version 9 31 x REFERENCE GUIDE 1 1553 FGC 101 1790 Uen Y ...
Page 10: ...Preliminary Pages x 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 26: ...Introduction 1 16 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 42: ...Getting Started 3 6 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 140: ...Getting Started 3 104 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 184: ...Front Panel Control 4 44 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 278: ...Advanced Video Processing and Networking 6 4 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 304: ...Advanced Video Processing and Networking 6 30 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 324: ...Preventive Maintenance and Fault finding 8 4 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 346: ...Preventive Maintenance and Fault finding 8 26 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 386: ...Technical Specification B 20 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 388: ...Dolby E PCM Bypass and Switchout C 2 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 390: ...Dolby E PCM Bypass and Switchout C 4 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 392: ...Alarm Lists D 2 1 1553 FGC 101 1790 Uen X BLANK ...
Page 416: ...Logo Creator E 2 1 1553 FGC 101 1790 Uen Y BLANK ...
Page 422: ...Logo Creator E 8 1 1553 FGC 101 1790 Uen Y BLANK ...