bts: Fix bugs in RACH Tests (timer not started, wrong CS/PS function)

Change-Id: I619264654bfeafe4b76c8702ede5876a82c32f13
diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index e68a20d..48ca1fd 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -488,9 +488,7 @@
 
 /* like L1SAP_IS_PACKET_RACH */
 private function ra_is_ps(OCT1 ra) return boolean {
-	if (ra and4b 'F0'O == '70'O) {
-		return true;
-	} else if (ra and4b '0F'O == '0F'O) {
+	if ((ra and4b 'F0'O == '70'O) and (ra and4b '0F'O != '0F'O)) {
 		return true;
 	}
 	return false;
@@ -522,6 +520,7 @@
 		fn_last := fn;
 
 		timer T := 5.0;
+		T.start;
 		alt {
 		[] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_CHAN_RQD(ra, fn, ?))) {
 			T.stop;
@@ -558,6 +557,7 @@
 	}
 	var integer rsl_chrqd := 0;
 	timer T := 3.0;
+	T.start;
 	alt {
 	[] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_CHAN_RQD(?,?))) {
 		rsl_chrqd := rsl_chrqd + 1;