Ericsson SPR1100 Operations Instructions Page 178

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Stream Processing and Networking
Table 6.1 IP Overhead
Item Overhead factor Comments
MPEG-2 TS 1.0
UDP 1324/1316 = 1.006 UDP header=8 bytes
IP 1344/1324 = 1.015 IP header=20 bytes
Ethernet 1358/1344 = 1.010 Eth header=14 bytes
Total overhead factor becomes: 1.006 x 1.015 x 1.010 = 1.031 or 3.1% overhead.
Note: The number of MPEG-2 TS packets one can map down into each UDP
frame is variable (between 1 and 7). Usually 7 is used for minimum
overhead. This is also used in the above calculation.
6.2 SPR1100 Transport Streams
6.2.1 Overview
6.2.1.1 MPEG-2 Compliancy
The encapsulated Transport Stream packets (video, audio, VBI/ANC data and PCR
- 188 bytes), are fully compliant MPEG-2 Transport Streams (all relevant fields
completed, continuity counters, PTS/DTS, adaptation fields etc.).
6.2.1.2 Transport Streams
The system can form up to 128 outpu
t Transport Streams, with each stream
mirrored on the two physical output interfaces.
Transport Streams are encapsulated in either a UDP or a UDP and RTP packet.
6.2.1.3 TS IP Output Parameters
The followin
g parameters can be configured for a Transport Stream to be IP
encapsulated and output.
Table 6.2 TS IP Output Parameters
Parameter Value Description
TS packets per UDP packet 1 to 7 [Default 7]
Defines the number of Transport
Stream packets encapsulated in a
UDP packet
TS Mode CBR Constant bit rate output
2/1553-FGC 101 1400 Uen B
6-8
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