Type 0 Extension 31 - mattpascoe135/dab GitHub Wiki

The FIC re-direction feature is used to signal which data features, coded in FIG types 0, 1 and 2, are carried in the Auxiliary Information Channel (AIC). The feature is encoded in Extension 31 of FIG type 0 (FIG 0/31). Figure 59 shows the structure of the FIC overflow signalling field which is part of the Type 0 field (see also figure 4).

The following definitions apply:

###FIG type 0 flag field: this 32-bit field shall indicate which of the 32 Extensions of FIG type 0 are carried in the AIC, as follows:

`bi  (i = 0, ... , 31);`

`0: extension i is not carried in the AIC;`

`1: extension i is carried in the AIC.`

For the FIG type 0 flag field, b_0 to b_5, b_8, b_10, b_13, b_14, b_19, b_26, b_28 and b_31 shall be set to "0" because the corresponding information shall always be carried entirely in the FIC.

###FIG type 1 flag field: this 8-bit field shall indicate which of the 8 extensions of FIG type 1 are carried in the AIC, as follows:

`bi  (i = 0, ... , 7);`

`0: extension i is not carried in the AIC;`

`1: extension i is carried in the AIC.`

###FIG type 2 flag field: this 8-bit field shall indicate which of the 8 extensions of FIG type 2 are carried in the AIC, as follows:

`bi  (i = 0, ... , 7);`

`0: extension i is not carried in the AIC;`

`1: extension i is carried in the AIC.`

When any flags in the FIG type 0 flag field (with the exception of flags b21 and b24) or in the FIG type 1 or FIG type 2 flag fields are set to "1" and the OE flag (see clause 5.2.2) is set to "1", the corresponding information may also be carried entirely in the AIC. When any of the flags b21 and b24 are set to "1", the corresponding information shall be carried in the FIC also but the data repetition rate may be reduced.

When any of the remaining flags in the FIG type 0, the FIG type 1 or the FIG type 2 flag fields is set to "1" and the OE flag is set to "0", the corresponding information shall be carried in the FIC also, but the data repetition rate may be reduced.