Feature #4396
Circuit Switched Data (CSD) Support
Status:
New
Priority:
Low
Assignee:
-
Category:
-
Target version:
-
Start date:
02/13/2020
Due date:
% Done:
0%
Resolution:
Spec Reference:
Description
This would primarily entail:
- permitting the related bearer types on the 04.08 CC side
- configuring the DSP correctly to perform the 45.003 interleaving / coding for the respective bearer type
- implementing the various rate adaptation functions to get to the individual sync/async characters. AFAIR there even was a hardware accelerator (maybe that was only MTK, not TI?). In any case, we want a software implementation on the host PC side, we don't care about an efficient implementation on the baseband chip.
Test/development could be done against Racal 6103, which supports both data + fax calls
Related issues
History
#2 Updated by laforge 12 months ago
- Related to Feature #1572: Circuit Switched Data (CSD) Support added
#3 Updated by fixeria 3 months ago
configuring the DSP correctly to perform the 45.003 interleaving / coding for the respective bearer type
JFYI, here is an extract from include/calypso/l1_environment.h:
/* Channel mode definitions for DEDICATED mode */
#define SIG_ONLY_MODE 0 // signalling only
#define TCH_FS_MODE 1 // speech full rate
#define TCH_HS_MODE 2 // speech half rate
#define TCH_96_MODE 3 // data 9,6 kb/s
#define TCH_48F_MODE 4 // data 4,8 kb/s full rate
#define TCH_48H_MODE 5 // data 4,8 kb/s half rate
#define TCH_24F_MODE 6 // data 2,4 kb/s full rate
#define TCH_24H_MODE 7 // data 2,4 kb/s half rate
#define TCH_EFR_MODE 8 // enhanced full rate
#define TCH_144_MODE 9 // data 14,4 kb/s half rate
