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Transport aspects                                              2


            11.2.2.10  Inventory commands and responses

            The inventory commands shall be used to determine the identification and capabilities of the FTU at the far
            end.  The  inventory  commands  shown  in  Table  11-29  may  be  initiated  by  either  FTU.  The  inventory
            responses shall be as shown in Table 11-30. The first byte of all inventory commands and responses shall be
            the  assigned  value  for  the  inventory  command  type,  as  shown  in  Table  11-4.  The  second  byte  of  the
            inventory commands shall be as specified in Table 11-29. The second byte (ACK) and all following bytes of
            the  inventory  responses  shall  be  as  specified  in  Table  11-30.  The  bytes  shall  be  sent  using  the  format
            described in clause 11.2.2.1.


                                Table 11-29 – Inventory commands sent by the requesting FTU

                                  Name                            Length (bytes)     Byte        Content
             Identification request                                    2               2        0116 (Note)
             Auxiliary inventory information request                   2               2        0216 (Note)
             Self-test results request                                 2               2        0316 (Note)

             Initialization flags request                              2               2        0416 (Note)
             Initialization flags reset request                        2               2        0516 (Note)
             NOTE – All other values for byte2 are reserved by ITU-T.


                                Table 11-30 – Inventory responses sent by the responding FTU

                                          Length
                       Name                               Byte                       Contents
                                          (bytes)
             ACK (identification)           58              2         8116 (Note)
                                                          3 to 10     Eight bytes of vendor ID.
                                                         11 to 26     Sixteen bytes of version number.
                                                         27 to 58     Thirty two bytes of serial number.
             ACK (auxiliary inventory     Variable          2         8216 (Note)
             information)
                                                            3         Segment code (SC)
                                                          4 to 11     Eight bytes of vendor ID.

                                                           12 +       Multiple bytes of auxiliary inventory
                                                                      information.
             Self-test results              6               2         8316 (Note)
                                                          3 to 6      Four bytes of self-test results.
             Initialization flags           3               2         8416 (Note)

                                                            3         One byte with the value of the initialization
                                                                      flags.
             Initialization flags reset     3               2         8516 (Note)
                                                            3         One byte with the value of the initialization
                                                                      flags before the reset.
             NOTE – All other values for byte 2 are reserved by ITU-T.
            Upon reception of one of the inventory commands, the FTU shall send the corresponding response. Any
            function of either the requesting or the responding FTU shall not be affected by the command.

            The vendor ID in the response identifies the system integrator and shall be formatted according to the
            vendor ID of [ITU-T G.994.1]. In the context of this request, the system integrator usually refers to the
            vendor of the smallest field-replaceable unit; thus, the vendor ID in the response may not be the same as
            the vendor ID indicated during the ITU-T G.994.1 handshake phase of the initialization.


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