Page 941 - 5G Basics - Core Network Aspects

Transport aspects 2

The element of the probe sequence carried by the sync symbol of the O-P-SYNCHRO 2 signal shall continue
the probe sequence transmitted during the CHANNEL DISCOVERY 2 stage with no interruption.

The symbols of the O-P-SYNCHRO 2 signal shall use all subcarriers from the SUPPORTEDCARRIERSds set
modulated as defined in clause 10.2.2.2.

The transmit PSD of the O-P-SYNCHRO 2 signal shall be CDPSDds.
12.3.3.3.6 Signals during R-VECTOR 1.1 stage

12.3.3.3.6.1 O-P-VECTOR 1-1
The FTU-O shall start transmitting the O-P-VECTOR 1-1 signal right after completion of the O-P-SYNCHRO 2
signal (starting from the symbol with index 0 of the following downstream logical frame). The format,
modulation and transmit PSD of the O-P-VECTOR 1-1 signal shall be the same as the O-P-CHANNEL-
DISCOVERY 2 signal. The SOC shall send O-IDLE and use robust bit mapping. The SOC symbol repetitions and
IDS shall be applied. The SOC quadrant scrambler shall be in the reset mode. The probe sequence
modulating sync symbols shall be continued from the previous stages with no interruption. The transmit
PSD shall be equal to CDPSDds. The O-P-VECTOR 1-1 signal shall use all subcarriers from the
SUPPORTEDCARRIERSds set.
NOTE – During the R-VECTOR 1.1 stage, the VCE may adjust the post-canceller coefficients and FEQ gains at the FTU-O
to accommodate the updates of the upstream time gap Tg1' and to accommodate the update of the upstream transmit
PSD to CDPSDus as requested in O-UPDATE message.

The O-P-VECTOR 1-1 signal shall be followed by the O-P-SYNCHRO 3 signal, which determines the actual
duration of the R-VECTOR 1.1 stage. The start time for the transmission of the O-P-SYNCHRO 3 signal shall
be at the symbol with index 0 of the first downstream logical frame of a superframe and is determined by
the VCE.
12.3.3.3.6.2 R-P-VECTOR 1-1

The FTU-R shall start transmitting the R-P-VECTOR 1-1 signal right after reception of the O-P-SYNCHRO 2
signal (starting from the following superframe). The format and modulation of the R-P-VECTOR 1-1 signal
shall be the same as the R-P-VECTOR 1 signal. The probe sequence modulating sync symbols shall be
continued from the previous stages. The applied US time gap Tg1' shall be updated as indicated in O-UPDATE
message starting from symbol 0 of the first upstream logical frame of R-P-VECTOR 1-1 signal.
The transmit PSD of the FTU-R shall be CDPSDus starting from the first superframe of R-P-VECTOR 1-1
signal. The value of CDPSDus shall be computed using the final electrical length and updated value of PSD
ceiling indicated in O-UPDATE message. The R-P-VECTOR 1-1 signal shall use all subcarriers from the
SUPPORTEDCARRIERSus set.
The R-P-VECTOR 1-1 signal shall be terminated upon reception of the O-P-SYNCHRO 3 signal. After
reception of the O-P-SYNCHRO 3 signal, the FTU-R shall transition to the VECTOR 2 stage starting from the
symbol with index 0 of the upstream logical frame that follows the last symbol of the O-P-SYNCHRO 3
signal.

12.3.3.3.6.3 O-P-SYNCHRO 3

The O-P-SYNCHRO 3 signal provides an exact time marker for transition from the R-VECTOR 1.1 stage to the
VECTOR 2 stage. The O-P-SYNCHRO 3 signal shall have the same format, start time and duration as the
O-P-SYNCHRO 1 signal. During transmission of the O-P-SYNCHRO 3 signal, the SOC is inactive.
The element of the probe sequence carried by the sync symbol of the O-P-SYNCHRO 3 signal shall continue
the probe sequence transmitted during the R-VECTOR 1.1 stage with no interruption.
The data symbols of the O-P-SYNCHRO 3 signal shall use all subcarriers from the SUPPORTEDCARRIERSds
modulated as defined in clause 10.2.2.2.

The transmit PSD of the O-P-SYNCHRO 3 signal shall be CDPSDds.

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