The Siemens BS-11 supports the following additional GSM 12.21 OML operations: CREATE OBJECT abis_om_fom_hdr.obj_class can be A3: A5: ALCO, BBSIG, CCLK, GPSU, LI, PA A8: EnvaBTSE A9: BPORT the abis_om_obj_inst.trx_nr field indicates the index of object, whereas the abis_om_fom_hdr.bts_nr indicates the type of the object. enum abis_bs11_objtype { BS11_OBJ_ALCO = 0x01, BS11_OBJ_BBSIG = 0x02, /* obj_class: 0,1 */ BS11_OBJ_TRX1 = 0x03, /* only DEACTIVATE TRX1 */ BS11_OBJ_CCLK = 0x04, BS11_OBJ_GPSU = 0x06, BS11_OBJ_LI = 0x07, BS11_OBJ_PA = 0x09, /* obj_class: 0, 1*/ }; In case of CREATE ENVABTSE, the abis_om_obj_inst.trx_nr indicates the EnvaBTSEx number. In case of A9 (CREAETE BPORT), the abis_om_obj_inst.bts_nr indicates which BPORT shall be used.