Page 743 - 5G Basics - Core Network Aspects

Transport aspects 2

Table 9-5 – Downstream RMC command (sent by FTU-O only)
Field name Format Description

ACK bit-map Six bytes: ACK bitmap [b47 ...b0], the bit b0 relates to the last
byte 0: [b7 ... b0] transmitted DTU(s) in the ACK window (see clause 9.7).
byte 1: [b15... b8] Any given bit of the ACK bitmap shall be set to one for ACK
byte 2: [b23 ... b16] and 0 for NACK.
byte 3: [b31 ... b24]
byte 4: [b39 ... b32]
byte 5: [b47 ... b40]
ACK group size, RMC ACK, One byte: [e ddd aa = ACK group size (Gack), represented as an unsigned
upstream flow control and aabc] integer with valid values one, two, three.
indicator bits b = acknowledgement of the RMC message; shall be set to
one for ACK and zero for NACK.
c = indicates the status of the RX Enable primitive (values
RXon/RXoff) over the γ reference point (in the upstream
direction).
If c=0, upstream transmission is enabled (RXon).
If c=1, upstream transmission is disabled (RXoff).
If upstream transmission is disabled or the received RMC
message is corrupted, the FTU-R shall accept no data
packets over the γ reference point until the transmission is
enabled again.
The FTU-R shall apply the TX Enable primitive associated
with the received RX Enable status immediately after
decoding the RMC command.
ddd = indicator bits, one bit per defect. The bits shall be
placed according to the following order: [los lom lor].
An indicator bit shall be set to zero if the corresponding
primitive/defect occurs and set to one otherwise (active
low).
The bits shall be set to zero if a defect occurs and set to one
otherwise (active low).
e = positive acknowledgement on reception of a TIGARESP
command (TIGARESP-ACK).
e=1 indicates that a TIGARESP command was received and
positively acknowledged.
e=0 indicates that no TIGARESP command was received and
positively acknowledged.
The generation and use of this bit is defined in
clause 13.2.2.1.

Downstream logical frame Three bytes Logical frame configuration parameters to be used for the
configuration current frame or for the following frame, depending on the
value of MB downstream (see clause 10.7 and Table 12-44).
The format of frame configuration parameters is defined in
Table 9-6.

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