diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 2cf17ae..931c9ab 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -236,6 +236,10 @@
 	timer T := 2.0;
 	var PCUIF_send_data sd;
 	map(self:PCU, system:PCU);
+	if (mp_pcu_socket == "") {
+		g_pcu_conn_id := -1;
+		return;
+	}
 	g_pcu_conn_id := f_pcuif_connect(PCU, mp_pcu_socket);
 
 	T.start;
@@ -265,9 +269,12 @@
 
 	f_init_pcu(id);
 
-	/* start with a default moderate timing offset equalling TA=2 */
-	f_main_trxc_connect();
-	f_TRXC_transceive(BB_TRXC, g_bb_trxc_conn_id, valueof(ts_TRXC_FAKE_TIMING(2*256)));
+	if (mp_bb_trxc_port != -1) {
+		var TrxcMessage ret;
+		/* start with a default moderate timing offset equalling TA=2 */
+		f_main_trxc_connect();
+		ret := f_TRXC_transceive(BB_TRXC, g_bb_trxc_conn_id, valueof(ts_TRXC_FAKE_TIMING(2*256)));
+	}
 }
 
 /* Attach L1CTL to master test_CT (classic tests, non-handler mode) */
@@ -342,7 +349,9 @@
 	map(self:L1CTL, system:L1CTL);
 	f_connect_reset(L1CTL);
 
-	f_trxc_connect();
+	if (mp_bb_trxc_port != -1) {
+		f_trxc_connect();
+	}
 
 	g_Tguard.start(pars.t_guard);
 	activate(as_Tguard());