Introduce NM BaseBand Transceiver FSM

Change-Id: Ib4d35316c52eb4c71ea0d352a1e06fd5e600fe08

15 files changed, 466 insertions, 13 deletions

diff --git a/include/osmocom/bsc/bts_trx.h b/include/osmocom/bsc/bts_trx.h
index 3a635ba28..5888c6318 100644
--- a/include/osmocom/bsc/bts_trx.h
+++ b/include/osmocom/bsc/bts_trx.h
@@ -18,6 +18,10 @@ struct gsm_bts;
 
 #define TRX_NR_TS	8
 
+struct gsm_bts_bb_trx {
+	struct gsm_abis_mo mo;
+};
+
 /* One TRX in a BTS */
 struct gsm_bts_trx {
 	/* list header in bts->trx_list */
@@ -41,9 +45,7 @@ struct gsm_bts_trx {
 
 	struct gsm_abis_mo mo;
 	struct tlv_parsed nm_attr;
-	struct {
-		struct gsm_abis_mo mo;
-	} bb_transc;
+	struct gsm_bts_bb_trx bb_transc;
 
 	uint16_t arfcn;
 	int nominal_power;		/* in dBm */
@@ -78,6 +80,10 @@ struct gsm_bts_trx {
 	struct gsm_bts_trx_ts ts[TRX_NR_TS];
 };
 
+static inline struct gsm_bts_trx *gsm_bts_bb_trx_get_trx(struct gsm_bts_bb_trx *bb_transc) {
+	return (struct gsm_bts_trx *)container_of(bb_transc, struct gsm_bts_trx, bb_transc);
+}
+
 struct gsm_bts_trx *gsm_bts_trx_alloc(struct gsm_bts *bts);
 char *gsm_trx_name(const struct gsm_bts_trx *trx);
 
diff --git a/include/osmocom/bsc/nm_common_fsm.h b/include/osmocom/bsc/nm_common_fsm.h
index 719d591a8..2ffb59f67 100644
--- a/include/osmocom/bsc/nm_common_fsm.h
+++ b/include/osmocom/bsc/nm_common_fsm.h
@@ -54,3 +54,12 @@ enum nm_bts_op_fsm_states {
 	NM_BTS_ST_OP_ENABLED,
 };
 extern struct osmo_fsm nm_bts_fsm;
+
+/* BaseBand Transceiver */
+enum nm_bb_transc_op_fsm_states {
+	NM_BB_TRANSC_ST_OP_DISABLED_NOTINSTALLED,
+	NM_BB_TRANSC_ST_OP_DISABLED_DEPENDENCY,
+	NM_BB_TRANSC_ST_OP_DISABLED_OFFLINE,
+	NM_BB_TRANSC_ST_OP_ENABLED,
+};
+extern struct osmo_fsm nm_bb_transc_fsm;
diff --git a/src/ipaccess/Makefile.am b/src/ipaccess/Makefile.am
index e49a77880..28d024aa6 100644
--- a/src/ipaccess/Makefile.am
+++ b/src/ipaccess/Makefile.am
@@ -57,6 +57,7 @@ ipaccess_config_LDADD = \
 	$(top_builddir)/src/osmo-bsc/nm_common_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_sm_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_fsm.o \
+	$(top_builddir)/src/osmo-bsc/nm_bb_transc_fsm.o \
 	$(OSMO_LIBS) \
 	$(NULL)
 
@@ -75,5 +76,6 @@ ipaccess_proxy_LDADD = \
 	$(top_builddir)/src/osmo-bsc/nm_common_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_sm_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_fsm.o \
+	$(top_builddir)/src/osmo-bsc/nm_bb_transc_fsm.o \
 	$(OSMO_LIBS) \
 	$(NULL)
diff --git a/src/osmo-bsc/Makefile.am b/src/osmo-bsc/Makefile.am
index 4584b2c1d..e6c98d138 100644
--- a/src/osmo-bsc/Makefile.am
+++ b/src/osmo-bsc/Makefile.am
@@ -77,6 +77,7 @@ osmo_bsc_SOURCES = \
 	neighbor_ident_vty.c \
 	net_init.c \
 	nm_common_fsm.c \
+	nm_bb_transc_fsm.c \
 	nm_bts_sm_fsm.c \
 	nm_bts_fsm.c \
 	gsm_08_08.c \
diff --git a/src/osmo-bsc/bts_ipaccess_nanobts.c b/src/osmo-bsc/bts_ipaccess_nanobts.c
index bb05236f3..a93183a96 100644
--- a/src/osmo-bsc/bts_ipaccess_nanobts.c
+++ b/src/osmo-bsc/bts_ipaccess_nanobts.c
@@ -131,6 +131,7 @@ static int nm_statechg_event(int evt, struct nm_statechg_signal_data *nsd)
 	struct gsm_bts_sm *bts_sm;
 	struct gsm_bts *bts;
 	struct gsm_bts_trx *trx;
+	struct gsm_bts_bb_trx *bb_transc;
 	struct gsm_bts_trx_ts *ts;
 	struct gsm_bts_gprs_nsvc *nsvc;
 
@@ -143,7 +144,9 @@ static int nm_statechg_event(int evt, struct nm_statechg_signal_data *nsd)
 
 	/* S_NM_STATECHG_ADM is called after we call chg_adm_state() and would create
 	 * endless loop */
-	if (obj_class != NM_OC_BTS && evt != S_NM_STATECHG_OPER)
+	if (obj_class != NM_OC_BTS &&
+	    obj_class != NM_OC_BASEB_TRANSC &&
+	    evt != S_NM_STATECHG_OPER)
 		return 0;
 
 	switch (obj_class) {
@@ -155,6 +158,10 @@ static int nm_statechg_event(int evt, struct nm_statechg_signal_data *nsd)
 		bts = obj;
 		osmo_fsm_inst_dispatch(bts->mo.fi, NM_EV_STATE_CHG_REP, nsd);
 		break;
+	case NM_OC_BASEB_TRANSC:
+		bb_transc = obj;
+		osmo_fsm_inst_dispatch(bb_transc->mo.fi, NM_EV_STATE_CHG_REP, nsd);
+		break;
 	case NM_OC_CHANNEL:
 		ts = obj;
 		trx = ts->trx;
@@ -262,14 +269,7 @@ static int sw_activ_rep(struct msgb *mb)
 	case NM_OC_BASEB_TRANSC:
 		if (!(trx = gsm_bts_trx_num(bts, foh->obj_inst.trx_nr)))
 			return -EINVAL;
-		abis_nm_chg_adm_state(trx->bts, foh->obj_class,
-				      trx->bts->bts_nr, trx->nr, 0xff,
-				      NM_STATE_UNLOCKED);
-		abis_nm_opstart(trx->bts, foh->obj_class,
-				trx->bts->bts_nr, trx->nr, 0xff);
-		/* TRX software is active, tell it to initiate RSL Link */
-		abis_nm_ipaccess_rsl_connect(trx, trx->bts->ip_access.rsl_ip,
-					     3003, trx->rsl_tei);
+		osmo_fsm_inst_dispatch(trx->bb_transc.mo.fi, NM_EV_SW_ACT_REP, NULL);
 		break;
 	case NM_OC_RADIO_CARRIER: {
 		if (!(trx = gsm_bts_trx_num(bts, foh->obj_inst.trx_nr)))
@@ -316,6 +316,8 @@ static void nm_rx_opstart_ack(struct msgb *oml_msg)
 	struct abis_om_fom_hdr *foh = msgb_l3(oml_msg);
 	struct e1inp_sign_link *sign_link = oml_msg->dst;
 	struct gsm_bts *bts = sign_link->trx->bts;
+	struct gsm_bts_trx *trx;
+
 	switch (foh->obj_class) {
 	case NM_OC_SITE_MANAGER:
 		osmo_fsm_inst_dispatch(bts->site_mgr.mo.fi, NM_EV_OPSTART_ACK, NULL);
@@ -323,6 +325,11 @@ static void nm_rx_opstart_ack(struct msgb *oml_msg)
 	case NM_OC_BTS:
 		osmo_fsm_inst_dispatch(bts->mo.fi, NM_EV_OPSTART_ACK, NULL);
 		break;
+	case NM_OC_BASEB_TRANSC:
+		if (!(trx = gsm_bts_trx_num(bts, foh->obj_inst.trx_nr)))
+			return;
+		osmo_fsm_inst_dispatch(trx->bb_transc.mo.fi, NM_EV_OPSTART_ACK, NULL);
+		break;
 	case NM_OC_CHANNEL:
 		nm_rx_opstart_ack_chan(oml_msg);
 		break;
@@ -336,6 +343,8 @@ static void nm_rx_opstart_nack(struct msgb *oml_msg)
 	struct abis_om_fom_hdr *foh = msgb_l3(oml_msg);
 	struct e1inp_sign_link *sign_link = oml_msg->dst;
 	struct gsm_bts *bts = sign_link->trx->bts;
+	struct gsm_bts_trx *trx;
+
 	switch (foh->obj_class) {
 	case NM_OC_SITE_MANAGER:
 		osmo_fsm_inst_dispatch(bts->site_mgr.mo.fi, NM_EV_OPSTART_NACK, NULL);
@@ -343,6 +352,11 @@ static void nm_rx_opstart_nack(struct msgb *oml_msg)
 	case NM_OC_BTS:
 		osmo_fsm_inst_dispatch(bts->mo.fi, NM_EV_OPSTART_ACK, NULL);
 		break;
+	case NM_OC_BASEB_TRANSC:
+		if (!(trx = gsm_bts_trx_num(bts, foh->obj_inst.trx_nr)))
+			return;
+		osmo_fsm_inst_dispatch(trx->bb_transc.mo.fi, NM_EV_OPSTART_NACK, NULL);
+		break;
 	default:
 		break;
 	}
@@ -480,8 +494,10 @@ void ipaccess_drop_oml(struct gsm_bts *bts, const char *reason)
 	osmo_stat_item_dec(bts->bts_statg->items[BTS_STAT_OML_CONNECTED], 1);
 
 	/* we have issues reconnecting RSL, drop everything. */
-	llist_for_each_entry(trx, &bts->trx_list, list)
+	llist_for_each_entry(trx, &bts->trx_list, list) {
 		ipaccess_drop_rsl(trx, "OML link drop");
+		osmo_fsm_inst_dispatch(trx->bb_transc.mo.fi, NM_EV_OML_DOWN, NULL);
+	}
 
 	osmo_fsm_inst_dispatch(bts->site_mgr.mo.fi, NM_EV_OML_DOWN, NULL);
 	osmo_fsm_inst_dispatch(bts->mo.fi, NM_EV_OML_DOWN, NULL);
diff --git a/src/osmo-bsc/bts_trx.c b/src/osmo-bsc/bts_trx.c
index 65ff7526e..c01444a0c 100644
--- a/src/osmo-bsc/bts_trx.c
+++ b/src/osmo-bsc/bts_trx.c
@@ -30,6 +30,16 @@
 #include <osmocom/bsc/system_information.h>
 #include <osmocom/bsc/pcu_if.h>
 #include <osmocom/bsc/debug.h>
+#include <osmocom/bsc/nm_common_fsm.h>
+
+static int gsm_bts_trx_talloc_destructor(struct gsm_bts_trx *trx)
+{
+	if (trx->bb_transc.mo.fi) {
+		osmo_fsm_inst_free(trx->bb_transc.mo.fi);
+		trx->bb_transc.mo.fi = NULL;
+	}
+	return 0;
+}
 
 struct gsm_bts_trx *gsm_bts_trx_alloc(struct gsm_bts *bts)
 {
@@ -39,11 +49,17 @@ struct gsm_bts_trx *gsm_bts_trx_alloc(struct gsm_bts *bts)
 	if (!trx)
 		return NULL;
 
+	talloc_set_destructor(trx, gsm_bts_trx_talloc_destructor);
+
 	trx->bts = bts;
 	trx->nr = bts->num_trx++;
 
 	gsm_mo_init(&trx->mo, bts, NM_OC_RADIO_CARRIER,
 		    bts->nr, trx->nr, 0xff);
+
+	trx->bb_transc.mo.fi = osmo_fsm_inst_alloc(&nm_bb_transc_fsm, trx, &trx->bb_transc,
+						   LOGL_INFO, NULL);
+	osmo_fsm_inst_update_id_f(trx->bb_transc.mo.fi, "bts%d-trx%d", bts->nr, trx->nr);
 	gsm_mo_init(&trx->bb_transc.mo, bts, NM_OC_BASEB_TRANSC,
 		    bts->nr, trx->nr, 0xff);
 
diff --git a/src/osmo-bsc/nm_bb_transc_fsm.c b/src/osmo-bsc/nm_bb_transc_fsm.c
new file mode 100644
index 000000000..d4875c18a
--- /dev/null
+++ b/src/osmo-bsc/nm_bb_transc_fsm.c
@@ -0,0 +1,337 @@
+/* NM BaseBand Transceiver FSM */
+
+/* (C) 2020 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
+ * Author: Pau Espin Pedrol <pespin@sysmocom.de>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <errno.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+#include <osmocom/core/fsm.h>
+#include <osmocom/core/tdef.h>
+#include <osmocom/gsm/protocol/gsm_12_21.h>
+
+#include <osmocom/bsc/bts.h>
+#include <osmocom/bsc/signal.h>
+#include <osmocom/bsc/abis_nm.h>
+#include <osmocom/bsc/bts_ipaccess_nanobts_omlattr.h>
+#include <osmocom/bsc/nm_common_fsm.h>
+#include <osmocom/bsc/debug.h>
+
+#define X(s) (1 << (s))
+
+#define nm_bb_transc_fsm_state_chg(fi, NEXT_STATE) \
+	osmo_fsm_inst_state_chg(fi, NEXT_STATE, 0, 0)
+
+//////////////////////////
+// FSM STATE ACTIONS
+//////////////////////////
+
+static void st_op_disabled_notinstalled_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state)
+{
+	struct gsm_bts_bb_trx *bb_transc = (struct gsm_bts_bb_trx *)fi->priv;
+
+	bb_transc->mo.adm_unlock_sent = false;
+	bb_transc->mo.opstart_sent = false;
+}
+
+static void st_op_disabled_notinstalled(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+	struct nm_statechg_signal_data *nsd;
+	struct gsm_nm_state *new_state;
+
+	switch (event) {
+	case NM_EV_SW_ACT_REP:
+		break;
+	case NM_EV_STATE_CHG_REP:
+		nsd = (struct nm_statechg_signal_data *)data;
+		new_state = nsd->new_state;
+		if (new_state->operational == NM_OPSTATE_ENABLED) {
+			/*should not happen... */
+			nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_ENABLED);
+			return;
+		}
+		switch (new_state->availability) { /* operational = DISABLED */
+		case NM_AVSTATE_DEPENDENCY:
+			nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_DISABLED_DEPENDENCY);
+			return;
+		case NM_AVSTATE_OFF_LINE:
+		case NM_AVSTATE_OK:
+			nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_DISABLED_OFFLINE);
+			return;
+		default:
+			return;
+		}
+	default:
+		OSMO_ASSERT(0);
+	}
+}
+
+static void configure_loop(struct gsm_bts_bb_trx *bb_transc, struct gsm_nm_state *state, bool allow_opstart)
+{
+	struct gsm_bts_trx *trx = gsm_bts_bb_trx_get_trx(bb_transc);
+	if (state->administrative != NM_STATE_UNLOCKED && !bb_transc->mo.adm_unlock_sent) {
+		bb_transc->mo.adm_unlock_sent = true;
+		/* Note: nanoBTS sometimes fails NACKing the BaseBand
+		   Transceiver Unlock command while in Dependency, specially
+		   during first attempt after boot. When NACK is received, the
+		   OML link is dropped and the whole procedure is restarted. */
+		abis_nm_chg_adm_state(trx->bts, NM_OC_BASEB_TRANSC,
+				      trx->bts->bts_nr, trx->nr, 0xff,
+				      NM_STATE_UNLOCKED);
+	}
+
+	if (allow_opstart && state->administrative == NM_STATE_UNLOCKED &&
+	    !bb_transc->mo.opstart_sent) {
+		bb_transc->mo.opstart_sent = true;
+		abis_nm_opstart(trx->bts, NM_OC_BASEB_TRANSC, trx->bts->bts_nr, trx->nr, 0xff);
+		/* TRX software is active, tell it to initiate RSL Link */
+		abis_nm_ipaccess_rsl_connect(trx, trx->bts->ip_access.rsl_ip,
+					     3003, trx->rsl_tei);
+	    }
+}
+
+static void st_op_disabled_dependency_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state)
+{
+	struct gsm_bts_bb_trx *bb_transc = (struct gsm_bts_bb_trx *)fi->priv;
+	struct gsm_bts_trx *trx = gsm_bts_bb_trx_get_trx(bb_transc);
+
+	/* nanoBTS is broken, doesn't follow TS 12.21. Opstart MUST be sent
+	   during Dependency, so we simply move to OFFLINE state here to avoid
+	   duplicating code */
+	if (trx->bts->type == GSM_BTS_TYPE_NANOBTS) {
+		nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_DISABLED_OFFLINE);
+		return;
+	}
+	configure_loop(bb_transc, &bb_transc->mo.nm_state, false);
+}
+
+static void st_op_disabled_dependency(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+	struct gsm_bts_bb_trx *bb_transc = (struct gsm_bts_bb_trx *)fi->priv;
+	struct nm_statechg_signal_data *nsd;
+	struct gsm_nm_state *new_state;
+
+	switch (event) {
+	case NM_EV_STATE_CHG_REP:
+		nsd = (struct nm_statechg_signal_data *)data;
+		new_state = nsd->new_state;
+		if (new_state->operational == NM_OPSTATE_ENABLED) {
+			/* should not happen... */
+			nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_ENABLED);
+			return;
+		}
+		switch (new_state->availability) { /* operational = DISABLED */
+		case NM_AVSTATE_NOT_INSTALLED:
+		case NM_AVSTATE_POWER_OFF:
+			nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_DISABLED_NOTINSTALLED);
+			return;
+		case NM_AVSTATE_OFF_LINE:
+		case NM_AVSTATE_OK:
+			nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_DISABLED_OFFLINE);
+			return;
+		case NM_AVSTATE_DEPENDENCY:
+			configure_loop(bb_transc, new_state, false);
+			return;
+		default:
+			return;
+		}
+	default:
+		OSMO_ASSERT(0);
+	}
+}
+
+static void st_op_disabled_offline_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state)
+{
+	struct gsm_bts_bb_trx *bb_transc = (struct gsm_bts_bb_trx *)fi->priv;
+
+	/* Warning: In here we may be acessing an state older than new_state
+	   from prev (syncrhonous) FSM state */
+	configure_loop(bb_transc, &bb_transc->mo.nm_state, true);
+}
+
+static void st_op_disabled_offline(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+	struct gsm_bts_bb_trx *bb_transc = (struct gsm_bts_bb_trx *)fi->priv;
+	struct gsm_bts_trx *trx = gsm_bts_bb_trx_get_trx(bb_transc);
+	struct nm_statechg_signal_data *nsd;
+	struct gsm_nm_state *new_state;
+
+	switch (event) {
+	case NM_EV_STATE_CHG_REP:
+		nsd = (struct nm_statechg_signal_data *)data;
+		new_state = nsd->new_state;
+		if (new_state->operational == NM_OPSTATE_ENABLED) {
+			nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_ENABLED);
+			return;
+		}
+		switch (new_state->availability) { /* operational = DISABLED */
+		case NM_AVSTATE_NOT_INSTALLED:
+		case NM_AVSTATE_POWER_OFF:
+			nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_DISABLED_NOTINSTALLED);
+			return;
+		case NM_AVSTATE_DEPENDENCY:
+			/* There's no point in moving back to Dependency in nanoBTS, since it's broken
+			   and it acts actually as if it was in Offline state */
+			if (trx->bts->type != GSM_BTS_TYPE_NANOBTS) {
+				nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_DISABLED_DEPENDENCY);
+			} else {
+				/* Moreover, in nanoBTS we need to check here for tx
+				   Opstart since we may have gone Unlocked state
+				   in this event, which means Opstart may be txed here. */
+				configure_loop(bb_transc, new_state, true);
+			}
+			return;
+		case NM_AVSTATE_OFF_LINE:
+		case NM_AVSTATE_OK:
+			configure_loop(bb_transc, new_state, true);
+			return;
+		default:
+			return;
+		}
+	default:
+		OSMO_ASSERT(0);
+	}
+}
+
+static void st_op_enabled_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state)
+{
+	struct gsm_bts_bb_trx *bb_transc = (struct gsm_bts_bb_trx *)fi->priv;
+
+	/* Reset state, we don't need it in this state and it will need to be
+	  reused as soon as we move back to Disabled */
+	bb_transc->mo.opstart_sent = false;
+	bb_transc->mo.adm_unlock_sent = false;
+}
+
+static void st_op_enabled(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+	struct nm_statechg_signal_data *nsd;
+	struct gsm_nm_state *new_state;
+
+	switch (event) {
+	case NM_EV_STATE_CHG_REP:
+		nsd = (struct nm_statechg_signal_data *)data;
+		new_state = nsd->new_state;
+		if (new_state->operational == NM_OPSTATE_ENABLED)
+			return;
+		switch (new_state->availability) { /* operational = DISABLED */
+		case NM_AVSTATE_NOT_INSTALLED:
+		case NM_AVSTATE_POWER_OFF:
+			nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_DISABLED_NOTINSTALLED);
+			return;
+		case NM_AVSTATE_DEPENDENCY:
+			nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_DISABLED_DEPENDENCY);
+			return;
+		case NM_AVSTATE_OFF_LINE:
+		case NM_AVSTATE_OK:
+			nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_DISABLED_OFFLINE);
+			return;
+		default:
+			return;
+		}
+	default:
+		OSMO_ASSERT(0);
+	}
+}
+
+static void st_op_allstate(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+	struct gsm_bts_bb_trx *bb_transc = (struct gsm_bts_bb_trx *)fi->priv;
+
+	switch (event) {
+	case NM_EV_OPSTART_ACK:
+	case NM_EV_OPSTART_NACK:
+		/* TODO: if on state OFFLINE and rx NACK, try again? */
+		bb_transc->mo.opstart_sent = false;
+		break;
+	case NM_EV_OML_DOWN:
+		nm_bb_transc_fsm_state_chg(fi, NM_BB_TRANSC_ST_OP_DISABLED_NOTINSTALLED);
+		break;
+	default:
+		OSMO_ASSERT(0);
+	}
+}
+
+static struct osmo_fsm_state nm_bb_transc_fsm_states[] = {
+	[NM_BB_TRANSC_ST_OP_DISABLED_NOTINSTALLED] = {
+		.in_event_mask =
+			X(NM_EV_SW_ACT_REP) |
+			X(NM_EV_STATE_CHG_REP),
+		.out_state_mask =
+			X(NM_BB_TRANSC_ST_OP_DISABLED_DEPENDENCY) |
+			X(NM_BB_TRANSC_ST_OP_DISABLED_OFFLINE) |
+			X(NM_BB_TRANSC_ST_OP_ENABLED),
+		.name = "DISABLED_NOTINSTALLED",
+		.onenter = st_op_disabled_notinstalled_on_enter,
+		.action = st_op_disabled_notinstalled,
+	},
+	[NM_BB_TRANSC_ST_OP_DISABLED_DEPENDENCY] = {
+		.in_event_mask =
+			X(NM_EV_STATE_CHG_REP),
+		.out_state_mask =
+			X(NM_BB_TRANSC_ST_OP_DISABLED_NOTINSTALLED) |
+			X(NM_BB_TRANSC_ST_OP_DISABLED_OFFLINE) |
+			X(NM_BB_TRANSC_ST_OP_ENABLED),
+		.name = "DISABLED_DEPENDENCY",
+		.onenter = st_op_disabled_dependency_on_enter,
+		.action = st_op_disabled_dependency,
+	},
+	[NM_BB_TRANSC_ST_OP_DISABLED_OFFLINE] = {
+		.in_event_mask =
+			X(NM_EV_STATE_CHG_REP),
+		.out_state_mask =
+			X(NM_BB_TRANSC_ST_OP_DISABLED_NOTINSTALLED) |
+			X(NM_BB_TRANSC_ST_OP_DISABLED_DEPENDENCY) |
+			X(NM_BB_TRANSC_ST_OP_ENABLED),
+		.name = "DISABLED_OFFLINE",
+		.onenter = st_op_disabled_offline_on_enter,
+		.action = st_op_disabled_offline,
+	},
+	[NM_BB_TRANSC_ST_OP_ENABLED] = {
+	.in_event_mask =
+		X(NM_EV_STATE_CHG_REP),
+	.out_state_mask =
+		X(NM_BB_TRANSC_ST_OP_DISABLED_NOTINSTALLED) |
+		X(NM_BB_TRANSC_ST_OP_DISABLED_DEPENDENCY) |
+		X(NM_BB_TRANSC_ST_OP_DISABLED_OFFLINE),
+	.name = "ENABLED",
+	.onenter = st_op_enabled_on_enter,
+	.action = st_op_enabled,
+	},
+};
+
+struct osmo_fsm nm_bb_transc_fsm = {
+	.name = "NM_BB_TRANSC_OP",
+	.states = nm_bb_transc_fsm_states,
+	.num_states = ARRAY_SIZE(nm_bb_transc_fsm_states),
+	.allstate_event_mask =
+		X(NM_EV_OPSTART_ACK) |
+		X(NM_EV_OPSTART_NACK) |
+		X(NM_EV_OML_DOWN),
+	.allstate_action = st_op_allstate,
+	.event_names = nm_fsm_event_names,
+	.log_subsys = DNM,
+};
+
+static __attribute__((constructor)) void nm_bb_transc_fsm_init(void)
+{
+	OSMO_ASSERT(osmo_fsm_register(&nm_bb_transc_fsm) == 0);
+}
diff --git a/src/utils/Makefile.am b/src/utils/Makefile.am
index 4d9ebaa64..12a7d45ef 100644
--- a/src/utils/Makefile.am
+++ b/src/utils/Makefile.am
@@ -59,6 +59,7 @@ bs11_config_LDADD = \
 	$(top_builddir)/src/osmo-bsc/nm_common_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_sm_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_fsm.o \
+	$(top_builddir)/src/osmo-bsc/nm_bb_transc_fsm.o \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOGSM_LIBS) \
 	$(LIBOSMOABIS_LIBS) \
@@ -133,6 +134,7 @@ meas_json_LDADD = \
 	$(top_builddir)/src/osmo-bsc/nm_common_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_sm_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_fsm.o \
+	$(top_builddir)/src/osmo-bsc/nm_bb_transc_fsm.o \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOGSM_LIBS) \
 	$(LIBOSMOABIS_LIBS) \
diff --git a/tests/abis/Makefile.am b/tests/abis/Makefile.am
index a40bdfdcb..cee3d6f05 100644
--- a/tests/abis/Makefile.am
+++ b/tests/abis/Makefile.am
@@ -35,6 +35,7 @@ abis_test_LDADD = \
 	$(top_builddir)/src/osmo-bsc/nm_common_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_sm_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_fsm.o \
+	$(top_builddir)/src/osmo-bsc/nm_bb_transc_fsm.o \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOABIS_LIBS) \
 	$(LIBOSMOGSM_LIBS) \
diff --git a/tests/acc/Makefile.am b/tests/acc/Makefile.am
index 176d01863..d8ce5eaa6 100644
--- a/tests/acc/Makefile.am
+++ b/tests/acc/Makefile.am
@@ -35,6 +35,7 @@ acc_test_LDADD = \
 	$(top_builddir)/src/osmo-bsc/nm_common_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_sm_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_fsm.o \
+	$(top_builddir)/src/osmo-bsc/nm_bb_transc_fsm.o \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOABIS_LIBS) \
 	$(LIBOSMOGSM_LIBS) \
diff --git a/tests/acc/acc_test.ok b/tests/acc/acc_test.ok
index 636dba889..7d79ee6fc 100644
--- a/tests/acc/acc_test.ok
+++ b/tests/acc/acc_test.ok
@@ -1,6 +1,7 @@
 ===test_acc_mgr_no_ramp===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_no_ramp()
 do_allowed_len_adm_loop(1)
@@ -109,10 +110,12 @@ pcu_info_update(): t2=0x03 t3=0xff, allowed:
 pcu_info_update(): t2=0x00 t3=0x00, allowed: 0 1 2 3 4 5 6 7 8 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_no_ramp()
 ===test_acc_mgr_manual_ramp===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_manual_ramp()
 do_allowed_len_ramp_loop(1)
@@ -351,10 +354,12 @@ pcu_info_update(): t2=0x03 t3=0xff, allowed:
 pcu_info_update(): t2=0x01 t3=0xb3, allowed: 2 3 6 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_manual_ramp()
 ===test_acc_mgr_rotate(true, 1)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 *** Barring one ACC ***
@@ -424,10 +429,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x03 t3=0xfd, allowed: 1
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(false, 1)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 (bts=0) ACC: update ACC allowed active subset 0x3ff -> 0x200 (active_len=1, ramp_len=10, adm_len=1, perm_len=10, rotation=on)
@@ -494,10 +501,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x01 t3=0xff, allowed: 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(true, 2)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 *** Barring one ACC ***
@@ -567,10 +576,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x03 t3=0xfc, allowed: 0 1
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(false, 2)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 (bts=0) ACC: update ACC allowed active subset 0x3ff -> 0x300 (active_len=2, ramp_len=10, adm_len=2, perm_len=10, rotation=on)
@@ -637,10 +648,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x00 t3=0xff, allowed: 8 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(true, 3)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 *** Barring one ACC ***
@@ -710,10 +723,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x02 t3=0xfc, allowed: 0 1 8
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(false, 3)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 (bts=0) ACC: update ACC allowed active subset 0x3ff -> 0x380 (active_len=3, ramp_len=10, adm_len=3, perm_len=10, rotation=on)
@@ -780,10 +795,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x00 t3=0x7f, allowed: 7 8 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(true, 4)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 *** Barring one ACC ***
@@ -853,10 +870,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x02 t3=0x7c, allowed: 0 1 7 8
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(false, 4)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 (bts=0) ACC: update ACC allowed active subset 0x3ff -> 0x3c0 (active_len=4, ramp_len=10, adm_len=4, perm_len=10, rotation=on)
@@ -923,10 +942,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x00 t3=0x3f, allowed: 6 7 8 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(true, 5)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 *** Barring one ACC ***
@@ -996,10 +1017,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x02 t3=0x3c, allowed: 0 1 6 7 8
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(false, 5)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 (bts=0) ACC: update ACC allowed active subset 0x3ff -> 0x3e0 (active_len=5, ramp_len=10, adm_len=5, perm_len=10, rotation=on)
@@ -1066,10 +1089,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x00 t3=0x1f, allowed: 5 6 7 8 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(true, 6)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 *** Barring one ACC ***
@@ -1139,10 +1164,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x02 t3=0x1c, allowed: 0 1 5 6 7 8
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(false, 6)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 (bts=0) ACC: update ACC allowed active subset 0x3ff -> 0x3f0 (active_len=6, ramp_len=10, adm_len=6, perm_len=10, rotation=on)
@@ -1209,10 +1236,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x00 t3=0x0f, allowed: 4 5 6 7 8 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(true, 7)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 *** Barring one ACC ***
@@ -1282,10 +1311,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x02 t3=0x0c, allowed: 0 1 4 5 6 7 8
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(false, 7)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 (bts=0) ACC: update ACC allowed active subset 0x3ff -> 0x3f8 (active_len=7, ramp_len=10, adm_len=7, perm_len=10, rotation=on)
@@ -1352,10 +1383,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x00 t3=0x07, allowed: 3 4 5 6 7 8 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(true, 8)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 *** Barring one ACC ***
@@ -1425,10 +1458,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x02 t3=0x04, allowed: 0 1 3 4 5 6 7 8
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(false, 8)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 (bts=0) ACC: update ACC allowed active subset 0x3ff -> 0x3fc (active_len=8, ramp_len=10, adm_len=8, perm_len=10, rotation=on)
@@ -1495,10 +1530,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x00 t3=0x03, allowed: 2 3 4 5 6 7 8 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_mgr_rotate(false, 9)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_mgr_rotate()
 (bts=0) ACC: update ACC allowed active subset 0x3ff -> 0x3fe (active_len=9, ramp_len=10, adm_len=9, perm_len=10, rotation=on)
@@ -1565,10 +1602,12 @@ sys={40.000000}: select()
 pcu_info_update(): t2=0x00 t3=0x01, allowed: 1 2 3 4 5 6 7 8 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_mgr_rotate()
 ===test_acc_ramp===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_ramp()
 (bts=0) ACC: update ACC allowed active subset 0x3ff -> 0x000 (active_len=0, ramp_len=0, adm_len=10, perm_len=10, rotation=off)
@@ -1604,10 +1643,12 @@ sys={450.000000}: select()
 pcu_info_update(): t2=0x00 t3=0x00, allowed: 0 1 2 3 4 5 6 7 8 9
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_ramp()
 ===test_acc_ramp2===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_ramp2()
 (bts=0) ACC: update ACC allowed active subset 0x3ff -> 0x3f8 (active_len=7, ramp_len=10, adm_len=7, perm_len=10, rotation=on)
@@ -1625,10 +1666,12 @@ pcu_info_update(): t2=0x03 t3=0x80, allowed: 0 1 2 3 4 5 6
 sys={15.000000}: select()
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_ramp2()
 ===test_acc_ramp3===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_ramp3()
 *** Barring some ACCs ***
@@ -1662,10 +1705,12 @@ sys={45.000000}: select()
 (bts=0) ACC: update ACC allowed active subset 0x15a -> 0x15a (active_len=5, ramp_len=10, adm_len=10, perm_len=5, rotation=off)
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_ramp3()
 ===test_acc_ramp_up_rotate(0, 100, 100)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_ramp_up_rotate()
 *** Barring one ACC ***
@@ -1755,10 +1800,12 @@ sys={3000.000000}: select()
 sys={3250.000000}: select()
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_ramp_up_rotate()
 ===test_acc_ramp_up_rotate(0, 20, 50)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_ramp_up_rotate()
 *** Barring one ACC ***
@@ -1848,10 +1895,12 @@ sys={3000.000000}: select()
 sys={3250.000000}: select()
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_ramp_up_rotate()
 ===test_acc_ramp_up_rotate(70, 80, 90)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_ramp_up_rotate()
 *** Barring one ACC ***
@@ -1941,10 +1990,12 @@ sys={3000.000000}: select()
 sys={3250.000000}: select()
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_ramp_up_rotate()
 ===test_acc_ramp_updown_rotate(80, 90, 0, 100, 15)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_ramp_updown_rotate()
 *** Barring one ACC ***
@@ -2064,10 +2115,12 @@ sys={7250.000000}: select(48): chan_load_avg=90
 sys={7500.000000}: select(49): chan_load_avg=100
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_ramp_updown_rotate()
 ===test_acc_ramp_updown_rotate(30, 50, 10, 100, 15)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_ramp_updown_rotate()
 *** Barring one ACC ***
@@ -2211,10 +2264,12 @@ sys={4200.000000}: select(49): chan_load_avg=25
 pcu_info_update(): t2=0x03 t3=0xf9, allowed: 1 2
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_ramp_updown_rotate()
 ===test_acc_ramp_updown_rotate(50, 49, 0, 100, 10)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_ramp_updown_rotate()
 *** Barring one ACC ***
@@ -2368,10 +2423,12 @@ sys={4200.000000}: select(49): chan_load_avg=90
 pcu_info_update(): t2=0x03 t3=0xc7, allowed: 3 4 5
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_ramp_updown_rotate()
 ===test_acc_ramp_updown_rotate(30, 80, 30, 80, 5)===
 NM_BTS_SM_OP{DISABLED_NOTINSTALLED}: Allocated
 NM_BTS_OP{DISABLED_NOTINSTALLED}: Allocated
+NM_BB_TRANSC_OP{DISABLED_NOTINSTALLED}: Allocated
 (bts=0) ACC: New ACC allowed subset 0x3ff (active_len=10, ramp_len=10, adm_len=10, perm_len=10, rotation=off)
 BTS allocation OK in test_acc_ramp_updown_rotate()
 *** Barring one ACC ***
@@ -2431,4 +2488,5 @@ sys={12250.000000}: select(48): chan_load_avg=70
 sys={12500.000000}: select(49): chan_load_avg=75
 NM_BTS_SM_OP(bts_sm){DISABLED_NOTINSTALLED}: Deallocated
 NM_BTS_OP(bts0){DISABLED_NOTINSTALLED}: Deallocated
+NM_BB_TRANSC_OP(bts0-trx0){DISABLED_NOTINSTALLED}: Deallocated
 BTS deallocated OK in test_acc_ramp_updown_rotate()
diff --git a/tests/bsc/Makefile.am b/tests/bsc/Makefile.am
index 4d3d37979..ff2d48fcc 100644
--- a/tests/bsc/Makefile.am
+++ b/tests/bsc/Makefile.am
@@ -49,6 +49,7 @@ bsc_test_LDADD = \
 	$(top_builddir)/src/osmo-bsc/nm_common_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_sm_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_fsm.o \
+	$(top_builddir)/src/osmo-bsc/nm_bb_transc_fsm.o \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOGSM_LIBS) \
 	$(LIBOSMOVTY_LIBS) \
diff --git a/tests/gsm0408/Makefile.am b/tests/gsm0408/Makefile.am
index b2451e2e0..bc8e558e7 100644
--- a/tests/gsm0408/Makefile.am
+++ b/tests/gsm0408/Makefile.am
@@ -38,6 +38,7 @@ gsm0408_test_LDADD = \
 	$(top_builddir)/src/osmo-bsc/nm_common_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_sm_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_fsm.o \
+	$(top_builddir)/src/osmo-bsc/nm_bb_transc_fsm.o \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOGSM_LIBS) \
 	$(LIBOSMOABIS_LIBS) \
diff --git a/tests/handover/Makefile.am b/tests/handover/Makefile.am
index 4617518e9..1309380f9 100644
--- a/tests/handover/Makefile.am
+++ b/tests/handover/Makefile.am
@@ -83,6 +83,7 @@ handover_test_LDADD = \
 	$(top_builddir)/src/osmo-bsc/nm_common_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_sm_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_fsm.o \
+	$(top_builddir)/src/osmo-bsc/nm_bb_transc_fsm.o \
 	$(top_builddir)/src/osmo-bsc/osmo_bsc_ctrl.o \
 	$(top_builddir)/src/osmo-bsc/osmo_bsc_lcls.o \
 	$(top_builddir)/src/osmo-bsc/osmo_bsc_mgcp.o \
diff --git a/tests/nanobts_omlattr/Makefile.am b/tests/nanobts_omlattr/Makefile.am
index 09374b28d..d30be3376 100644
--- a/tests/nanobts_omlattr/Makefile.am
+++ b/tests/nanobts_omlattr/Makefile.am
@@ -32,6 +32,7 @@ nanobts_omlattr_test_LDADD = \
 	$(top_builddir)/src/osmo-bsc/nm_common_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_sm_fsm.o \
 	$(top_builddir)/src/osmo-bsc/nm_bts_fsm.o \
+	$(top_builddir)/src/osmo-bsc/nm_bb_transc_fsm.o \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOGSM_LIBS) \
 	$(LIBOSMOABIS_LIBS) \