Page 839 - 5G Basics - Core Network Aspects

Transport aspects 2

The FTU-O may reject a L3 Request using reason code 0116 if it is temporarily busy, or reject it using code
0316 if it has local knowledge that the L3 state is not desired at this time. Upon receipt of a L3 Request, the
FTU-O may reply with a Grant and immediately start transition into the L3 state.
If the FTU-R receives the Grant response, the FTU-R shall stop transmitting. When the FTU-O observes the
stopped transmission, it shall transition into O-DEACTIVATING1 state (see clause 12.1.2).

11.2.2.12.2 L3 Request by FTU-O
Upon receipt of a L3 Request, the responding FTU-R shall send either a Grant or a Reject response. If the
format of the command is different than one presented in Table 11-34, the Reject response shall be sent
with the reason code 0216.

The FTU-R may reject a L3 Request using reason code 0116 if it is temporarily busy, or reject it using code
0316 if it has local knowledge that the L3 state is not desired at this time. Upon receipt of a L3 Request, the
FTU-R may reply with a Grant and immediately start transition into the L3 state.

If the FTU-O receives the Grant response, the FTU-O shall transition into O-DEACTIVATING1 state (see
clause 12.1.2). When the FTU-R observes that the FTU-O transitioned to the O-DEACTIVATING1 state, it
shall stop transmitting.

11.2.2.13 PMD test parameter read commands and responses
The PMD test parameter read commands shall be used to retrieve the values of the PMD test parameters
that are specified in clause 11.4.1 and maintained by the far-end FTU. The PMD test parameter read
commands are shown in Table 11-37, and may be initiated by either FTU. The responses shall be as shown
in Table 11-38. The first byte of all PMD test parameter read commands and responses shall be the
assigned value for the PMD test parameter read command type, as shown in Table 11-5. The subsequent
bytes of the commands shall be as shown in Table 11-37. The subsequent bytes of the responses shall be as
shown in Table 11-38. The bytes shall be sent using the format described in clause 11.2.2.1.

Table 11-37 – PMD test parameter read commands sent by the requesting FTU

Length
Name Byte Content Support
(bytes)
Single read 2 2 0116 (Note 1) Mandatory
Vector block 7 2 0616 (Note 1) Mandatory
read
One byte containing the ID of the vector test parameter
to be read (Note 2).
3
0416: SNR per subcarrier group (Note 3).
0516: Downstream ALN per subcarrier group.
4 and 5 Two bytes describing the start subcarrier group index.
6 and 7 Two bytes describing the stop subcarrier group index.
NOTE 1 – All other values for byte 2 are reserved by the ITU-T.
NOTE 2 – All other values for byte 3 are reserved by the ITU-T.
NOTE 3 – The only valid value of subcarrier group size (G) for SNR is G = 1.

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