| 摘要 |
<p>In telecommunication systems comprising upstream units (1) and downstream units (2,3), upstrcam units (1) are provided with first adders (15) for adding first additional information like extra cells or extra bytes to a downstream and first detectors (13) for detecting second additional information like extra bytes for error correction purposes, and downstream units (2,3) are provided with second adders (22,32) for adding said second additional information for error correction purposes to said upstream and second detectors (25,35) for detecting said first additional information for in response to said detecting of said first additional information configuring said second additional information. Said configurable error correction for the upstream possibly together with an additional error correction for the downstream allows low cost lasers having a low output power to be used, with said error correction taking care of errors resulting from the lower output power, and with the configurability of said error correction allowing the amount of error correction to be dependent upon for example the size of the network. <IMAGE> <IMAGE></p> |
