OPTION 005 GMSK Bt 0.3
Annex A-4
GMSK MODULATION
Modulation type
GMSK Bt 0.3 to GSM recommendation 05.04.
Modulation accuracy
Phase accuracy as defined by GSM 05.05 − 4.6 is 1° RMS, 3° peak.
Data coding
SelecTable as uncoded, or differentially coded to GSM recommendation 05.04 − 2.3 for
internal or external modulation.
INTERNAL MODULATION
An internal data source provides a Traffic Channel format superframe hierarchy.
Individual slots may be null data, fixed data, or contain (2
9
−1) Pseudo Random Binary Sequence
(PRBS) data as defined in CCITT rec. V.52. Successive slots contain 156, 156, 156, 157 bits
when on internal clock or external 'integer' clock. An internal data source provides data output
on the DATA and clock on the CLOCK connectors. Internal data can either be edited from the
front panel and stored or entered using the GPIB.
The RF envelope may be ramped up and down to GSM 05.05 annex 2 and GSM 05.05 −
4.2.2.
The internal data generator can be used with an external clock as in ‘External
Modulation’.
Data storage
Data in the data generator can be stored and edited from the front panel or via the GPIB.
Data store sizes are:
100 slots of which 2 are defined as null (SLOT 0) and PRBS (SLOT 99)
100 frames containing any of the stored slots in any order
100 multiframes containing any of the stored frames in any order
40 superframes containing any of the stored multiframes in any order.
Internal modulation outputs
Data output: TTL compatible.
Clock output: TTL compatible.
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