diff --git a/lapd/L1CTL_PortType.ttcn b/lapd/L1CTL_PortType.ttcn
new file mode 100644
index 0000000..d726ce4
--- /dev/null
+++ b/lapd/L1CTL_PortType.ttcn
@@ -0,0 +1,52 @@
+/* dual-faced port that wraps an Unixdomain port and encodes/decodes L1CTL */
+module L1CTL_PortType {
+	import from L1CTL_Types all;
+	import from UD_PortType all;
+	import from UD_Types all;
+
+	type record L1CTL_connect {
+		charstring	path
+	}
+
+	type record L1CTL_connect_result {
+		UD_Result_code	result_code optional,
+		charstring	err optional
+	}
+
+	private function L1CTL_to_UD_connect(in L1CTL_connect pin, out UD_connect pout) {
+		pout.path := pin.path;
+		pout.id := 0;
+	} with { extension "prototype(fast)" }
+
+	private function UD_to_L1CTL_connect_result(in UD_connect_result pin, out L1CTL_connect_result pout) {
+		pout.result_code := pin.result.result_code;
+		pout.err := pin.result.err;
+	} with { extension "prototype(fast)" }
+
+	private function L1CTL_to_UD_ul(in L1ctlUlMessage pin, out UD_send_data pout) {
+		var L1ctlUlMessageLV msg_lv := { msg := pin };
+		pout.data := enc_L1ctlUlMessageLV(msg_lv);
+		pout.id := 0;
+	} with { extension "prototype(fast)" }
+
+	private function UD_to_L1CTL_dl(in UD_send_data pin, out L1ctlDlMessage pout) {
+		var L1ctlDlMessageLV msg_lv := dec_L1ctlDlMessageLV(pin.data);
+		pout:= msg_lv.msg;
+	} with { extension "prototype(fast)" }
+
+	type port L1CTL_PT message {
+		out L1ctlUlMessage
+		out L1CTL_connect
+		in L1ctlDlMessage
+		in L1CTL_connect_result
+		in UD_listen_result
+		in UD_connected
+	} with { extension "user UD_PT
+		out(L1ctlUlMessage -> UD_send_data: function(L1CTL_to_UD_ul);
+		    L1CTL_connect -> UD_connect: function(L1CTL_to_UD_connect))
+		in(UD_send_data -> L1ctlDlMessage: function(UD_to_L1CTL_dl);
+		   UD_connect_result -> L1CTL_connect_result: function(UD_to_L1CTL_connect_result);
+		   UD_listen_result -> UD_listen_result: simple;
+		   UD_connected -> UD_connected: simple
+		)" }
+}