BTS_Tests.ttcn: indicate default RSSI=-60 to FakeTRX

Change-Id: Ib13e3f8d9fbcd2722c6522a1bb5c513e34adfb18
diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 50aaee7..98d439a 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -418,8 +418,9 @@
 		map(self:BTS_TRXC, system:BTS_TRXC);
 		f_init_trxc(BTS_TRXC, id, g_bts_trxc_conn_id);
 
-		/* start with a default moderate timing offset equalling TA=2 */
+		/* Start with a default moderate timing offset equalling TA=2, and RSSI=-60 */
 		ret := f_TRXC_transceive(BTS_TRXC, g_bts_trxc_conn_id, valueof(ts_TRXC_FAKE_TIMING(2*256)));
+		ret := f_TRXC_transceive(BTS_TRXC, g_bts_trxc_conn_id, valueof(ts_TRXC_FAKE_RSSI(-60)));
 	}
 
 	/* Wait some extra time to make sure the BTS emits a stable carrier.