diff --git a/pcu/PCU_Tests.ttcn b/pcu/PCU_Tests.ttcn
index c69101b..4acde04 100644
--- a/pcu/PCU_Tests.ttcn
+++ b/pcu/PCU_Tests.ttcn
@@ -325,9 +325,12 @@
 	return false;
 }
 
-/* FIXME: properly encode RA (see TS 24.060, table 11.2.5.2) */
+/* One phase packet access (see 3GPP TS 44.018, table 9.1.8.1) */
+private const BIT8 chan_req_def := '01111000'B;
+
 private function f_establish_tbf(out GsmRrMessage rr_imm_ass, uint8_t bts_nr := 0,
-				 uint16_t ra := oct2int('3A'O), uint8_t is_11bit := 0,
+				 uint16_t ra := bit2int(chan_req_def),
+				 uint8_t is_11bit := 0,
 				 PCUIF_BurstType burst_type := BURST_TYPE_0,
 				 TimingAdvance ta := 0)
 runs on RAW_PCU_Test_CT return boolean {