Chapter 6

The MPEG-2 4:2:2 SD Decoding Card provides 4:2:2 video decoding facilities.

6.1.6MPEG-4 AVC 4:2:2 Decoding Card (RX8200/BAS/2)

This option is only available for the RX8200 DVB Receiver.

RX8200/BAS/2 is equipped with MPEG-4 4:2:2 decoding functionality. This function is dormant and is enabled with additional software options.

6.1.7IP Output Card (RX8XXX/HWO/IP/OUT)

This option is available for the RX8200, 8310, 8315 and 8330 DVB Receivers.

The IP Output card supports 1000BaseT Ethernet transmission of encapsulated transport stream.

The mapping of MPEG-2 TS packets into IP data frames is done according to the protocol stack shown in Figure 6.1. The figure shows the Protocol Stack in use when mapping MPEG-2 into IP frames and Ethernet.

Control traffic for in- band management (telnet, http, snmp)

MPEG-2 Transport Stream (Multi-Program Transport Stream or Single-Program Transport Stream)

MPEG-2/DVB layer

TCP/UDP

UDP – User Datagram Protocol

 

 

Transport layer - IP

Link layer – 1000BaseT Ethernet

Figure 6.1: The Protocol Stack

The MPEG-2/DVB layer is specified in ISO/IEC IS 13818 – Generic Coding of Moving Pictures and Associated Audio. The UDP layer is compliant with RFC768 – User Datagram Protocol. A configurable number of 188 byte MPEG-2 TS packets are mapped straight into an UDP frame with no additional overhead. The MTU for Ethernet is usually 1500 bytes. This limits the number of MPEG-2 TS packets per UDP frame to lie within one to seven.

The IP layer is according to RFC791 – Internet Protocol Specification.

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