Page 958 - 5G Basics - Core Network Aspects

2 Transport aspects

Bit b2 defines the status of NTR frequency synchronization:
– If b2=1, PMD sample clock is locked to the NTR
– If b2=0, PMD sample clock is independent from the NTR

12.3.4.2.4 R-ACK 1
R-ACK 1 is a one-byte SOC message that acknowledges correct reception of the O-TPS message. The format
shall be as defined in Table 12-47.

Table 12-47 – R-ACK 1 message

Field Field name Format
1 Message descriptor Message code

Field 1 "Message descriptor" is a unique one-byte code (8716) that identifies the message. See Table 12-7
for a complete list of codes.

12.3.4.2.5 O-PMS
The O-PMS message conveys the initial PMS-TC parameter settings that shall be used in the upstream
direction during showtime. The list of parameters carried by the O-PMS message is shown in Table 12-48.

Table 12-48 – O-PMS message
Field Field name Format
1 Message descriptor Message code

2 DPus Data path descriptor
3 RMCPus US RMC path descriptor
4 RMCPds DS RMC path descriptor
5 Upstream ACK window shift One byte
6 Upstream MNDSNOI One byte

Field 1 "Message descriptor" is a unique one-byte code (0916) that identifies the message. See Table 12-7
for a complete list of codes.

Field 2 "DPus" is a field that contains the PMS-TC parameters required for data path in the upstream
direction. The "Data path descriptor" format specified in Table 12-49 shall be used. All values in Table 12-49
are unsigned integers.

Table 12-49 – Data path descriptor

Byte Field Format Description
1 and 2 BD Two bytes Contains the value of BD for the data symbol

3 and 4 BDR Two bytes Contains the value of BDR for the RMC symbol
5 RD One byte Contains the value of RFEC for the data path
6 ND One byte Contains the value of NFEC for the data path
7 Q One byte Number of FEC codewords per DTU

Field 3 "RMCPus" is a field that contains the PMS-TC parameters required for RMC in the upstream
direction. The "RMC path descriptor" format specified in Table 12-50 shall be used. All values in Table 12-50
are unsigned integers.

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