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2                                                 Transport aspects


                                    Table 11-9 – OLR commands sent by the initiating FTU

                  Name        Length (bytes)   Byte                    Content                    Support
                                                 2      0216 (Note 1)
                                                 3      Segment code (SC)
                                                 4      [00bb 000a]
                                                        a = 0: bit swapping
                                                        a = 1: autonomous SRA
                                                        bb = 00: Reserved by ITU-T
                                                        bb = 01:  NOI only
                                                        bb = 10:  DOI only
                                                        bb = 11:  NOI and DOI

                                                 5      One byte for Q
                                                 6      One byte for KFEC
                                                 7      One byte for RFEC
             OLR request                         8      [0000 aaaa]
             type 2                                     aaaa = NOI SRA configuration change count
                              Variable
             (Autonomous                                (SCCC)                                  Mandatory

             SRA and bit                      9 and 10   Two bytes for the NOI number of subcarriers
             swapping)                                  Nf to be modified (Note 3).
             (Note 5)                         Variable   NOI subcarrier parameter block
                                                        A variable number of bytes (SN) describing the
                                                        subcarrier parameter field for each subcarrier
                                                        (Note 6).
                                              11 + SN   [0000 aaaa]
                                                        aaaa = DOI SRA configuration change count
                                                        (SCCC)
                                              12 + SN    Two bytes for the DOI number of subcarriers
                                             and 13 + SN  Nf to be modified (Note 3).
                                              Variable   DOI subcarrier parameter block
                                                        A variable number of bytes describing the
                                                        subcarrier parameter field for each
                                                        subcarrier.
                                                 2      0316 (Note 1)
                                                 3      Segment code (SC)
                                                        [00bb 000a]
                                                        a = 0: indicates the real relative gain
                                                        compensation factor.
                                                        a = 1: indicates the complex relative gain
                                                 4      compensation factor
                                                        bb = 00: Reserved by ITU-T
                                                        bb = 01:  NOI only
                                                        bb = 10:  DOI only
             OLR request      Variable                  bb = 11:  NOI and DOI
             type 3                           5 and 6   Two bytes for the NOI start subcarrier index.   Mandatory
             (TIGA)                           7 and 8   Two bytes for the NOI stop subcarrier index.
                                                        NOI subcarrier parameter block
                                                        A variable number of bytes (SN) describing
                                              Variable
                                                        subcarrier parameter field for each subcarrier
                                                        (Note 6).
                                             9 + SN and   Two bytes for the DOI start subcarrier index.
                                              10 + SN
                                              11 + SN    Two bytes for the DOI stop subcarrier index.
                                             and 12 + SN

                                              Variable   DOI subcarrier parameter block


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