diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 809a403..a74b3fe 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -51,11 +51,14 @@
 	charstring mp_bb_trxc_ip := "127.0.0.1";
 	integer mp_bb_trxc_port := 6701;
 	charstring mp_pcu_socket := PCU_SOCK_DEFAULT;
-	integer mp_tolerance_rxqual := 1;
-	integer mp_tolerance_rxlev := 3;
 	charstring mp_ctrl_ip := "127.0.0.1";
 	integer mp_ctrl_port := 4238;
+	integer mp_tolerance_rxqual := 1;
+	integer mp_tolerance_rxlev := 3;
+	integer mp_tolerance_timing_offset_256syms := 0;
 	integer mp_rxlev_exp := 57;
+	integer mp_ms_actual_ta_exp := 0;
+	integer mp_timing_offset_256syms_exp := 512;
 }
 
 type record of RslChannelNr ChannelNrs;
@@ -521,10 +524,10 @@
 				rxqual := 0
 			}
 		},
-		timing_offset_256syms := 0,
+		timing_offset_256syms := mp_timing_offset_256syms_exp,
 		bs_power_level := 0,
 		ms_power_level := 0,
-		ms_actual_ta := 0
+		ms_actual_ta := mp_ms_actual_ta_exp
 	},
 	spec := omit,
 	encr := omit
@@ -1258,7 +1261,7 @@
 	if (l1p.toa256_enabled) {
 		ul_meas.len := (3+8);
 		ul_meas.supp_meas_info := {
-			toa256_mean := l1p.timing_offset_256syms,
+			toa256_mean := f_tolerance(l1p.timing_offset_256syms, -63*256, 192*256, mp_tolerance_timing_offset_256syms),
 			toa256_min := ?,
 			toa256_max := ?,
 			toa256_std_dev := ?
@@ -1279,10 +1282,10 @@
 		ms_power_lvl := l1p.ms_power_level,
 		fpc := false,
 		reserved := 0,
-		actual_ta := l1p.ms_actual_ta
+		actual_ta := f_tolerance(l1p.ms_actual_ta, 0, 63, mp_tolerance_timing_offset_256syms/256)
 	};
 	var uint8_t offs := toffs256s_to_rsl(l1p.timing_offset_256syms);
-	var template uint8_t t_toffs := (offs-1 .. offs+1);	 /* some tolerance */
+	var template uint8_t t_toffs := f_tolerance(offs, 0, 255, mp_tolerance_timing_offset_256syms/256);
 	return tr_RSL_MEAS_RES_OSMO(g_chan_nr, g_next_meas_res_nr, ul_meas, bs_power, l1_info,
 				    ?, t_toffs);
 }
@@ -1399,17 +1402,12 @@
 	f_l1_tune(L1CTL);
 	RSL.clear;
 
-	if (mp_bb_trxc_port != -1) {
-		g_pars.l1_pars.meas_ul.full.rxlev := dbm2rxlev(-100);
-		f_trxc_fake_rssi(100);
-
-		g_pars.l1_pars.timing_offset_256syms := 512; /* 2 symbols */
-		f_trx_fake_toffs256(g_pars.l1_pars.timing_offset_256syms);
-	} else {
-		g_pars.l1_pars.timing_offset_256syms := 0; /* FIXME */
-		g_pars.l1_pars.meas_ul.full.rxlev := dbm2rxlev(-55); /* FIXME */
-	}
+	g_pars.l1_pars.meas_ul.full.rxlev := dbm2rxlev(-100);
 	g_pars.l1_pars.meas_ul.sub.rxlev := g_pars.l1_pars.meas_ul.full.rxlev;
+	if (mp_bb_trxc_port != -1) {
+		f_trxc_fake_rssi(100);
+		f_trx_fake_toffs256(g_pars.l1_pars.timing_offset_256syms);
+	}
 
 	f_est_dchan();