Page 838 - 5G Basics - Core Network Aspects

2 Transport aspects

Table 11-33 – FTU management counters

Anomaly counters

Retransmission test parameters
EFTR_min (see clause 11.4.1.1.6)
Error-free bits counter (see clause 11.4.1.1.9)
NOTE – Inhibiting of counters is defined in clause 11.4.4.6.
NOTE – The FTU-O should respond to the request from the NMS to read the values of management counters. It is left
to the implementations to store and update the counters as necessary for accurate error monitoring and reporting.
11.2.2.12 L3 link state transition commands and responses

The L3 link state transition command shall be used to propose a transition to link state L3. The L3 link state
transition command may be initiated by either FTU. The peer FTU shall acknowledge by sending a response.
The first byte of either the command or a response shall be the assigned value for the L3 link state
transition command type, as shown in Table 11-5 (normal priority command). The remaining bytes shall be
as shown in Table 11-34 and Table 11-35 for commands and responses, respectively.

Table 11-34 – L3 link state transition command (sent by the initiating FTU)

Length
Name Byte Content
(bytes)
L3 Request 3 2 0116 (Note)
3 0316 (Note)
NOTE – All other values for bytes 2 and 3 are reserved by ITU-T.

Table 11-35 – L3 link state transition responses (sent by the responding FTU)

Name Length (bytes) Byte Content

Grant 2 2 8016 (Note)
Reject 3 2 8116 (Note)
3 One byte for reason code.
NOTE – All other values for byte 2 are reserved by ITU-T.
Reason codes associated with the L3 link state transition commands are shown in Table 11-36.

Table 11-36 – Reason codes for L3 link state transition commands

Reason Byte value

Busy 0116
Invalid command 0216
Not desired at this time 0316
NOTE – All other reason codes are reserved by ITU-T.

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

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