OC-3/STM-1 Forward Error Correction
The Forward Error Correction Firmware Module is a value added firmware module for the 4 x OC-3/STM-1 Trunk Modules for the Nimbra One/300 platforms. It provides comprehensive forward error correction capabilities to the trunk module. Typically it should be used when running traffic over unreliable media such as microwave links that are prone to bit and burst errors.All services are protected since the FEC works on the link level.
| Packaging: |
Firmware module for the 4 x OC-3/STM-1 Trunk Modules for Nimbra One/300 |
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Framing:
OC-3
STM-1 |
STS-3c, ANSI T1.105
STM-1, ITU-T Rec G.707
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Mapping:
DTM |
STS-3c SPE / VC-4 Synchronous;
ETSI ES 201 803-4 adapted for FEC
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Capacity:
Payload
Ports supported |
261 slots per frmae / 133.632 Mbps
Physical ports 1 and 2 Ports 3 and 4 of the board cannot be used at all together with the Forward Error Correction FW and are thus disabled.
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Forward Error Correction (FEC):
Code
Interleaving
Error burst tolerance
Added delay |
Reed-Solomon (255,237,t=9) correcting up to 9 bytes per code block
260 x 9 matrix (equals STS-3c SPE/VC-4 frame), interleaving depth of 9
Up to 648 errored bits (81 bytes) in a burst.
~150μs
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