Type 0 Extension 21 - mattpascoe135/dab GitHub Wiki

#Extenstion 21 - Frequency Information The Frequency Information feature is assigned to providing radio Frequency Information (FI). If this applies to the whole tuned ensemble or to a DRM, FM or AM service carrying a Primary service component from the tuned ensemble, the OE flag shall be set to "0" in the FIG type 0 sub-header (see clause 5.2.2.1).

The Frequency Information feature is also used to provide frequencies of ensembles other than the tuned ensemble (R&M = "0000" and "0001"), and of DRM, FM and AM services which are not identical with a primary programme service component from the tuned ensemble (R&M = "0110", "1000", "1001", "1010", "1100" and "1110"). In these cases, the OE flag shall be set to "1" in the FIG type 0 sub-header (see clause 5.2.2.1).

The feature is encoded in Extension 21 of FIG type 0 (FIG 0/21). Figure 52 shows the structure of the FI field which is part of the Type 0 field (see also figure 4).

This feature shall use the SIV signalling (see clause 5.2.2.1). The database shall be divided by use of a database key. Changes to the database shall be signalled using the CEI.

Not yet completed

Check out page 104 of ETSI EN documentation