Page 961 - 5G Basics - Core Network Aspects

Transport aspects 2

If, within the constraints of the channel initialization policies defined in clause 12.3.7, the receiver is able to
select a set of configuration parameters, the "Initialization success/failure code" indicates the initialization
success. Valid “Initialization success/failure codes” are as follows:
8016: Initialization success;
8116: Configuration error;
8216: Configuration not feasible on line;
0016: Feature not supported.

Other values are reserved by the ITU-T.
If an initialization success/failure code 0016, 8116 or 8216 is set:
– all values in fields 3, 4, 5 and 6 shall be set to 0; and

– the FTU-O shall return to L3 link state instead of L0 link state at the completion of the initialization
procedures.
Field 8: "upstream gi table" contains the gi values for every subcarrier in MEDLEYus. The gi shall indicate the
scale factor that shall be applied to subcarrier i, relative to the gain that was used for that subcarrier during
the transmission of R-P-MEDLEY. The gis shall only be defined for subcarriers from the MEDLEYus set
(as indicated in R-PRM message), and shall be sent in ascending order of subcarrier indices i. Each gi value
shall be represented as an unsigned 12-bit fixed-point quantity, with the binary point assumed just to the
right of the third most significant bit. For example, a gi with binary representation (MSB listed first)
000.0100000002 would instruct the FTU-R to scale the constellation for subcarrier i by a gain of 0.25, so that
the power of that subcarrier would be 12.04 dB lower than it was during R-P-MEDLEY. Each two gi values of
subcarriers 2i and 2i+1 shall be mapped onto a 24-bit field as follows: [g2i g2ig2ig2i g2ig2ig2ig2i g2ig2ig2ig2i
M
M
M
M
g2i+1 g2i+1g2i+1g2i+1 g2i+1g2i+1g2i+1g2i+1 g2i+1g2i+1g2i+1g2i+1], where g2i and g2i+1 are the MSBs of the g2i and g2i+1
binary representations, respectively. If the NSCus is odd, the last 12 bits are padded by 0.
Field 9 "Upstream FRA sub-bands" contains the start and stop frequencies of the FRA subbands (see clause
13.3.1.1) for the upstream direction. It shall be formatted as a band descriptor (see Table 12-21) and shall
specify up to eight contiguous subbands.
12.3.4.2.8 R-PMD

The R-PMD message conveys the initial PMD parameter settings that shall be used in the downstream
direction during the showtime. The list of parameters carried by the R-PMD message is shown in
Table 12-53.

Table 12-53 – R-PMD message

Field Field name Format
1 Message descriptor Message code
2 Bit-loading table for data symbol ceiling(NSC ds/2) bytes
3 Number of RMC DS subcarriers (NSCR ds) Two bytes
4 Downstream RMC tone set (RTSds) 3 × ceiling(NSCR ds/2) bytes coded as follows:
Bits 0-11: rsc2n–1
Bits 12-23: rsc2n
5 Bit-loading table for RMC DS subcarriers ceiling(NSCR ds/2) bytes
6 Tone ordering table 3 × ceiling(NSC ds/2) bytes coded as follows:
Bits 0-11: t2n−1
Bits 12-23: t2n
7 Showtime pilot tones Tone descriptor
8 Initialization status One byte
9 Downstream FRA sub-bands Sub-band descriptor

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