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Transport aspects                                              2


            Symbols are cyclically extended and transmitted onto the medium with an overlap, as defined in clause
            10.4.4.

            The electrical characteristics at the U interface are defined in clauses 7.3 to 7.6 and clause 14, and include
            total  aggregate  wideband  power;  in-band  and  out-of-band  transmit  PSD,  longitudinal  balance  and
            termination impedance.

            10.1.2  PMD_MGMT interface
            The PMD_MGMT reference point describes a logical interface between the PMD and the FME, see Figure
            10-1.  The  interface  is  defined  by  a  set  of  control  and  management  parameters  (primitives).  These
            parameters are divided into two groups:

            –       parameters generated by the FME and applied to the PMD;
            –       parameters retrieved by the PMD from the received signal and submitted to the PMD ME.
            The summary of the PMD_MGMT primitives is presented in Table 10-1.


                                    Table 10-1 – Summary of the PMD_MGMT primitives

                  Primitive        Direction                    Description                     Reference

                                TDD frame and superframe (fixed in showtime)
             MF                   FME → PMD     The number of symbol periods in a TDD frame.    Clause 10.5
                                  FME → PMD     The number of downstream symbol positions in a
             Mds                                                                            Clause 10.5
                                                TDD frame.
                                  FME → PMD     The number of upstream symbol positions in a
             Mus                                                                            Clause 10.5
                                                TDD frame.
             MSF                  FME → PMD     The number of TDD frames in a superframe.   Clause 10.6
             DRMCds               FME → PMD     The downstream RMC symbol offset, in symbols.    Clause 10.5.1
             DRMCus               FME → PMD     The upstream RMC symbol offset, in symbols.   Clause 10.5.1

                                  FME → PMD     Minimum number of data symbols in transmit
             MNDSNOI                                                                        Clause 12.3.4.2
                                                direction per logical frame. (Note)
                               TDD frame and superframe (dynamic in showtime)

             CNTSF                FME → PMD     Superframe count.                           Clause 10.6
             CNTLF                FME → PMD     Logical frame count.                        Clause 10.5.1
                                  FME → PMD     Number of symbol positions in the. downstream   Clause 10.7 and
             TTRds
                                                NOI                                         Table 8-3
                                  FME → PMD                                                 Clause 10.7 and
             TTRus                              Number of symbol positions in the upstream NOI.
                                                                                            Table 8-3
                                  FME → PMD     Number of quiet symbol positions inserted at the   Clause 10.7 and
             TAds
                                                beginning of the downstream DOI.            Table 8-3
                                  FME → PMD     Number of quiet symbol positions inserted at the   Clause 10.7 and
             TAus
                                                beginning of the upstream DOI.              Table 8-3
                                  FME → PMD     Transmission opportunity in the downstream   Clause 10.7 and
             TBUDGETds
                                                direction.                                  Table 8-3
                                  FME → PMD     Transmission opportunity in the upstream    Clause 10.7 and
             TBUDGETus
                                                direction.                                  Table 8-3
                                  FME → PMD     Idle/Quiet selector for the DOI in the downstream   Clause 10.7 and
             TIQ
                                                direction.                                  Table 8-3






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