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2                                                 Transport aspects




                                         Table 9-3 – Structure of an RMC command

                  Field name            Format                              Description
             Command header       1 byte: [b7b6aa aaaa]   aaaaaa = command ID.
             (Note)                                   The command ID is a unique six bit code that identifies the
                                                      command. See Table 9-4 for a complete list of commands.
                                                      b6 and b7 – Reserved for use by ITU-T
             Command data                             See specific commands' descriptions.
             NOTE – Command header is not present for the first command of the RMC message.

            Table 9-4 summarizes the different RMC commands.


                                                Table 9-4 – RMC commands

                   Command name            Command ID            Description/comments           Reference
             Downstream RMC                    N/A         Shall be included as the first   See Table 9-5
                                                           command in every downstream RMC
                                                           message.

             Upstream RMC                      N/A         Shall be included as the first   See Table 9-8
                                                           command in every upstream RMC
                                                           message.

             Receiver initiated FRA request    0316        May be included in any given RMC   See Table 9-10
                                                           message.
                                               0416                                         See Table 9-11
                                                           Up to two such commands may be
                                                           used within a single RMC message,
                                                           one command per operation interval.
             Reply to FRA request (FRA-R)      0516        Shall be included in response to an   See Table 9-13
                                                           FRA request.
                                               0616                                         See Table 9-14
                                                           Up to two such commands may be
                                                           used within a single RMC message,
                                                           one command per operation interval.
             Reply to SRA request (SRA-R)      0816        Shall be included in response to a   See Table 9-15
                                                           request for seamless rate adaptation
                                                           (SRA) including a request for bitswap
                                                           or a TIGARESP to indicate the instant
                                                           of parameter modification.



             Reply to RPA request (RPA-R)      0716        Shall be included in response to a RPA  See Table 9-16
                                                           request
             Upstream DRR reports              1016        Shall be included every NDRR logical   See Table 9-17
                                                           frames.
             L2 transition indicator           1116        Shall be included in response to a   See Table 9-17.1
             (L2-TRNS)                                     LinkState transition confirmation to
                                                           indicate the instant of LinkState
                                                           transition.
             Reply to L2TSA request            1216        Shall be included in a response to an   See Table 9-17.2
             (L2TSA-R)                                     L2TSA request to indicate the instant
                                                           of parameter modification.
                                               1316        Allocated for use by Annex X     See clause X.6.11


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