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Harald Welte laforge at gnumonks.orgHi Max, On Wed, Jul 20, 2016 at 06:50:24PM +0200, Max wrote: > Notice that while PDTCH is activated for both UL and DL, the PTCCH is > only activated for DL. > > As far as I've understood continuous TA procedure I've got to have PTCCH > activated in both directions. The problem is that I have troubles > locating the code which triggers the activation above. from osmo-bts/src/osmo-bts-sysmo/oml.c: static const struct sapi_dir pdtch_sapis[] = { { GsmL1_Sapi_Pdtch,»····GsmL1_Dir_TxDownlink }, { GsmL1_Sapi_Pdtch,»····GsmL1_Dir_RxUplink }, { GsmL1_Sapi_Ptcch,»····GsmL1_Dir_TxDownlink }, { GsmL1_Sapi_Prach,»····GsmL1_Dir_RxUplink }, #if 0 { GsmL1_Sapi_Ptcch,»····GsmL1_Dir_RxUplink }, { GsmL1_Sapi_Pacch,»····GsmL1_Dir_TxDownlink }, #endif I don't know exactly why it is commented out, probably because itw as simply not used at the time? -- - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)