diff --git a/pcu/RAW_NS.ttcn b/pcu/RAW_NS.ttcn
new file mode 100644
index 0000000..c04a3e2
--- /dev/null
+++ b/pcu/RAW_NS.ttcn
@@ -0,0 +1,213 @@
+module RAW_NS {
+
+/* Osmocom NS test suite for NS in TTCN-3
+ * (C) 2018-2019 Harald Welte <laforge@gnumonks.org>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+import from General_Types all;
+import from Osmocom_Types all;
+import from SGSN_Components all;
+import from Osmocom_Gb_Types all;
+import from NS_CodecPort all;
+import from NS_Types all;
+import from BSSGP_Types all;
+import from NS_CodecPort all;
+import from NS_CodecPort_CtrlFunct all;
+import from NS_Emulation all;
+import from Native_Functions all;
+import from IPL4asp_Types all;
+
+public type component RAW_NS_CT {
+	/* UDP port towards the bottom (IUT) */
+	port NS_CODEC_PT NSCP[4];
+	var ConnectionId g_ns_conn_id[4] := {-1, -1, -1, -1};
+	var NSConfiguration g_nsconfig[4];
+	timer g_T_guard;
+}
+
+public altstep as_Tguard() runs on RAW_NS_CT {
+	[] g_T_guard.timeout {
+		setverdict(fail, "Timeout of T_guard");
+		mtc.stop;
+		}
+}
+
+function f_init_ns_codec(integer idx := 0, float guard_secs := 60.0) runs on RAW_NS_CT {
+	var Result res;
+
+	if (not g_T_guard.running) {
+		g_T_guard.start(guard_secs);
+		activate(as_Tguard());
+	}
+
+	if (not isbound(g_nsconfig) or not isbound(g_nsconfig[idx])) {
+		/* copy most parts from mp_nsconfig */
+		g_nsconfig[idx] := mp_nsconfig;
+		/* adjust those parts different for each NS-VC */
+		g_nsconfig[idx].nsvci := mp_nsconfig.nsvci + idx;
+		g_nsconfig[idx].local_udp_port := mp_nsconfig.local_udp_port + idx;
+	}
+
+	map(self:NSCP[idx], system:NSCP);
+	/* Connect the UDP socket */
+	log("connecting NSCP[", idx, "] to ", g_nsconfig[idx]);
+	res := f_IPL4_connect(NSCP[idx], g_nsconfig[idx].remote_ip, g_nsconfig[idx].remote_udp_port,
+				g_nsconfig[idx].local_ip, g_nsconfig[idx].local_udp_port, 0, { udp := {}});
+	if (not ispresent(res.connId)) {
+		setverdict(fail, "Could not connect NS UDP socket, check your configuration ", g_nsconfig[idx]);
+		mtc.stop;
+	}
+	g_ns_conn_id[idx] := res.connId;
+
+}
+
+function f_ns_exp(template PDU_NS exp_rx, integer idx := 0) runs on RAW_NS_CT return PDU_NS {
+	var NS_RecvFrom nrf;
+	log("f_ns_exp() expecting ", exp_rx);
+	alt {
+	[] NSCP[idx].receive(t_NS_RecvFrom(exp_rx)) -> value nrf { }
+	[] NSCP[idx].receive {
+		setverdict(fail, "Received unexpected NS: ", nrf);
+		mtc.stop;
+		}
+	}
+	return nrf.msg;
+}
+
+/* perform outbound NS-ALIVE procedure */
+function f_outgoing_ns_alive(integer idx := 0) runs on RAW_NS_CT {
+	NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], t_NS_ALIVE));
+	alt {
+	[] NSCP[idx].receive(t_NS_RecvFrom(t_NS_ALIVE_ACK));
+	[] NSCP[idx].receive { repeat; }
+	}
+}
+
+/* perform outbound NS-ALIVE procedure */
+function f_outgoing_ns_alive_no_ack(integer idx := 0, float tout := 10.0) runs on RAW_NS_CT {
+	timer T := tout;
+	NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], t_NS_ALIVE));
+	T.start;
+	alt {
+	[] NSCP[idx].receive(t_NS_RecvFrom(t_NS_ALIVE_ACK)) {
+		setverdict(fail, "Received unexpected NS-ALIVE ACK");
+		}
+	[] NSCP[idx].receive { repeat; }
+	[] T.timeout {
+		setverdict(pass);
+		}
+	}
+}
+
+/* perform outbound NS-BLOCK procedure */
+function f_outgoing_ns_block(NsCause cause, integer idx := 0) runs on RAW_NS_CT {
+	NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_BLOCK(cause, g_nsconfig[idx].nsvci)));
+	alt {
+	[] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_BLOCK_ACK(g_nsconfig[idx].nsvci)));
+	[] NSCP[idx].receive { repeat; }
+	}
+}
+
+/* receive NS-ALIVE and ACK it */
+altstep as_rx_alive_tx_ack(boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
+	[] NSCP[idx].receive(t_NS_RecvFrom(t_NS_ALIVE)) {
+		NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], t_NS_ALIVE_ACK));
+		if (not oneshot) { repeat; }
+		}
+}
+
+/* Transmit BSSGP RESET for given BVCI and expect ACK */
+function f_tx_bvc_reset_rx_ack(BssgpBvci bvci, integer idx := 0, boolean exp_ack := true)
+runs on RAW_NS_CT {
+	var PDU_BSSGP bssgp_tx := valueof(ts_BVC_RESET(BSSGP_CAUSE_NET_SV_CAP_MOD_GT_ZERO_KBPS, bvci,
+							mp_gb_cfg.cell_id));
+	timer T := 5.0;
+	NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_UNITDATA(t_SduCtrlB, 0, enc_PDU_BSSGP(bssgp_tx))));
+	T.start;
+	alt {
+	[exp_ack] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_UNITDATA(t_SduCtrlB, 0,
+						  decmatch tr_BVC_RESET_ACK(bvci, ?)))) {
+		setverdict(pass);
+		}
+	[exp_ack] T.timeout {
+		setverdict(fail, "No response to BVC-RESET");
+		}
+	[not exp_ack] T.timeout {
+		setverdict(pass);
+		}
+	[] NSCP[idx].receive { repeat; }
+	}
+}
+
+/* Receive a BSSGP RESET for given BVCI and ACK it */
+altstep as_rx_bvc_reset_tx_ack(BssgpBvci bvci, boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
+	var NS_RecvFrom ns_rf;
+	/* FIXME: nail down received cell_id in match */
+	[] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_UNITDATA(t_SduCtrlB, 0,
+						  decmatch tr_BVC_RESET(?, bvci, ?))))
+								-> value ns_rf {
+		var PDU_BSSGP bssgp_rx := dec_PDU_BSSGP(ns_rf.msg.pDU_NS_Unitdata.nS_SDU);
+		var PDU_BSSGP bssgp_tx := valueof(ts_BVC_RESET_ACK(bvci, mp_gb_cfg.cell_id));
+		NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_UNITDATA(t_SduCtrlB, 0, enc_PDU_BSSGP(bssgp_tx))));
+		if (not oneshot) { repeat; }
+		}
+}
+
+
+/* Receive a BSSGP UNBLOCK for given BVCI and ACK it */
+altstep as_rx_bvc_unblock_tx_ack(BssgpBvci bvci, boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
+	var NS_RecvFrom ns_rf;
+	[] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_UNITDATA(t_SduCtrlB, 0,
+						  decmatch t_BVC_UNBLOCK(bvci))))
+								-> value ns_rf {
+		var PDU_BSSGP bssgp_rx := dec_PDU_BSSGP(ns_rf.msg.pDU_NS_Unitdata.nS_SDU);
+		var PDU_BSSGP bssgp_tx := valueof(t_BVC_UNBLOCK_ACK(bvci));
+		NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_UNITDATA(t_SduCtrlB, 0, enc_PDU_BSSGP(bssgp_tx))));
+		if (not oneshot) { repeat; }
+		}
+}
+
+/* Receive a BSSGP FLOW-CONTROL-BVC and ACK it */
+altstep as_rx_bvc_fc_tx_ack(BssgpBvci bvci, boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
+	var NS_RecvFrom ns_rf;
+	[] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_UNITDATA(t_SduCtrlB, bvci,
+						  decmatch tr_BVC_FC_BVC)))
+								-> value ns_rf {
+		var PDU_BSSGP bssgp_rx := dec_PDU_BSSGP(ns_rf.msg.pDU_NS_Unitdata.nS_SDU);
+		var OCT1 tag := bssgp_rx.pDU_BSSGP_FLOW_CONTROL_BVC.tag.unstructured_Value;
+		var PDU_BSSGP bssgp_tx := valueof(t_BVC_FC_BVC_ACK(tag));
+		NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_UNITDATA(t_SduCtrlB, bvci, enc_PDU_BSSGP(bssgp_tx))));
+		if (not oneshot) { repeat; }
+		}
+}
+
+/**********************************************************************************
+ * Classic Gb/IP bring-up test cases using NS-{RESET,BLOCK,UNBLOCK} and no IP-SNS *
+ **********************************************************************************/
+
+/* Receive a NS-RESET and ACK it */
+public altstep as_rx_ns_reset_ack(boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
+	var NS_RecvFrom ns_rf;
+	[] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_RESET(NS_CAUSE_OM_INTERVENTION, g_nsconfig[idx].nsvci,
+						  g_nsconfig[idx].nsei))) -> value ns_rf {
+		NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_RESET_ACK(g_nsconfig[idx].nsvci,
+									    g_nsconfig[idx].nsei)));
+		if (not oneshot) { repeat; }
+		}
+}
+/* Receive a NS-UNBLOCK and ACK it */
+public altstep as_rx_ns_unblock_ack(boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
+	var NS_RecvFrom ns_rf;
+	[] NSCP[idx].receive(t_NS_RecvFrom(t_NS_UNBLOCK)) -> value ns_rf {
+		NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], t_NS_UNBLOCK_ACK));
+		if (not oneshot) { repeat; }
+		}
+}
+
+}