Ericsson RX8000 - IP Encapsulation, FEC Parameters

Using the Equipment
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EN/LZT 790 0005 R7A
• Spanning Tree – Checking this box enables the Spanning Tree Protocol (STP).
• User Redundancy Mode – If checked, the output status (transmit or not) will be
determined by the TX Enable settings. If not checked, the status of the outputs
is determined by the redundancy engine.
3.18.4.6.5 IP encapsulation, FEC parameters
Figure 3.162 Output Tab > IP Encapsulation, FEC Parameters Section
• FEC Status – Displays whether Forward Error Correction is enabled or disabled.
• Stream Mode – Determines which protocol to use for forwarding Transport
Stream packets, and which version of FEC to use:
- Protocols can be UDP (User Datagram Protocol) or RTP (Real-time
Transport Protocol).
- FEC packets can be computed per rows (for n consecutive packets), per
columns (for m of every n
th
packet) or both.
• Linearise Mode – Determines where to put the FEC packets in the stream:
- Minimum delay – Packets are emitted immediately after the last related
data packet. This can cause uneven bandwidth as columns are ended nearly
the same time.
- Non block alignment – Columns are shifted (begin at different rows),
resulting in a more even bandwidth but are delayed.
- Block alignment – Columns begin in the same row, but the FEC packets
are emitted evenly.
• UDP Checksum Enable – Reports if UDP checksum computation is needed
and therefore enabled, or not and therefore disabled.
• FEC rows – Reports how many rows are needed to compute a column FEC.
• FEC columns – Reports how many columns are needed to compute a row FEC.