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Transport aspects 2

X.6.9 Channel initialization policy for DTA

The channel initialization policy for DTA shall be as specified in clause 12.3.7, except for the following two
constraints:
1) ETR ≥ ETR_min_eoc, where
a) For the purpose of verifying that ETR ≥ ETR_min_eoc, the ETR shall be calculated as defined in
clause X.6.8.3.3, however using the data symbol rate corresponding to the value of hs_Mds
instead of the values DTA_min_Mds and DTA_max_Mds.
b) The ETR_min_eoc calculation shall be done as described in Table 9-21. ETR_min might be
different from DTA_ETR_min.
NOTE – This implies that for the purpose of verifying that ETR ≥ ETR_min_eoc, the ETR and ETR_min_eoc
are calculated as if DTA were disabled, i.e., Mds = hs_Mds.
2) NDR ≤ NDR_max, where
a) The NDR for the downstream direction shall be calculated using the value Mds = DTA_max_Mds
(see clause X.6.7.4).
b) The NDR for the upstream direction shall be calculated using the value DTA_min_Mds
(see clause X.6.7.3).

c) The NDR_max shall be replaced with the value determined by the control parameter
DTA_NDR_max (see clause X.6.7.5).

X.6.10 High_BER event for DTA

The High_BER event for DTA shall be as specified in clause 12.1.4.3.4, except for the definition of the ETR,
which for DTA, and for the purpose of verifying that ETR ≥ ETR_min_eoc, shall be as described in
clause X.6.9.

X.6.11 RMC commands
RMC commands for use with DTA are shown in Table X.4.

Table X.4 – RMC commands

Command name Command ID Description/comments Reference

DTA update 1316 Indicates a request for DTA update. May be See Table X.4.1
included in any downstream RMC message.

Table X.4.1 – DTA update command (sent by the FTU-O only)

Field name Format Description
Command header 1 byte: [00 aaaaaa] aaaaaa = 1316

Number of downstream 1 byte: [00 aaaaaa] aaaaaa = the updated number of downstream
symbol periods (Mds) symbol periods in the TDD frame, represented as an
unsigned integer.
DTA frame down count 1 byte: [0000 aaaa] aaaa = The logical frame down count to
(DTAFDC) implemention of the DTA update, represented as an
unsigned integer.

X.7 Initialization messages
X.7.1 ITU-T G.994.1 Handshake phase

This clause describes the ITU-T G.994.1 message fields specific to Annex X operation and their usage. See
also clause 12.3.2.

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