diff --git a/smlc/BSC_ConnectionHandler.ttcn b/smlc/BSC_ConnectionHandler.ttcn
new file mode 100644
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--- /dev/null
+++ b/smlc/BSC_ConnectionHandler.ttcn
@@ -0,0 +1,95 @@
+module BSC_ConnectionHandler {
+
+/* BSC Connection Handler of SMLC Tests in TTCN-3
+ * (C) 2020 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * 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 Misc_Helpers all;
+import from General_Types all;
+import from Osmocom_Types all;
+import from SCCPasp_Types all;
+import from BSSAP_Types all;
+import from BSSAP_CodecPort all;
+import from RAN_Emulation all;
+import from BSSMAP_Templates all;
+import from BSSAP_LE_Emulation all;
+import from BSSAP_LE_Types all;
+import from BSSMAP_LE_Templates all;
+
+import from TELNETasp_PortType all;
+import from Osmocom_VTY_Functions all;
+
+/* this component represents a single subscriber connection at the SMLC. */
+type component BSC_ConnHdlr extends BSSAP_LE_ConnHdlr {
+	/* SCCP Connecction Identifier for the underlying SCCP connection */
+	var integer g_sccp_conn_id;
+
+	port TELNETasp_PT SMLCVTY;
+
+	var TestHdlrParams g_pars;
+
+	var charstring host_bsc := "127.0.0.4";
+
+	var boolean g_vty_initialized := false;
+}
+
+function f_BscConnHdlr_init_vty() runs on BSC_ConnHdlr {
+	if (not g_vty_initialized) {
+		map(self:SMLCVTY, system:SMLCVTY);
+		f_vty_set_prompts(SMLCVTY);
+		f_vty_transceive(SMLCVTY, "enable");
+		g_vty_initialized := true;
+	}
+}
+
+/* initialize all parameters */
+function f_BscConnHdlr_init() runs on BSC_ConnHdlr {
+	f_BscConnHdlr_init_vty();
+}
+
+/* Callback function from general BSSAP_LE_Emulation whenever a connectionless
+ * BSSAP_LE message arrives.  Can return a PDU_BSSAP_LE that should be sent in return */
+private function BSSAP_LE_UnitdataCallback(PDU_BSSAP_LE bssap)
+runs on BSSAP_LE_Emulation_CT return template PDU_BSSAP_LE {
+	var template PDU_BSSAP_LE resp := omit;
+
+	/* answer all RESET with a RESET ACK */
+	if (match(bssap, tr_BSSMAP_LE_Reset)) {
+		resp := ts_BSSMAP_LE_ResetAck;
+	}
+
+	return resp;
+}
+
+const BssapLeOps BSC_BssapLeOps := {
+	create_cb := refers(BSSAP_LE_Emulation.ExpectedCreateCallback),
+	unitdata_cb := refers(BSSAP_LE_UnitdataCallback),
+	decode_dtap := false,
+	role_ms := false,
+	sccp_addr_local := omit,
+	sccp_addr_peer := omit
+}
+type record TestHdlrParams {
+	hexstring imsi,
+	integer bssap_le_idx,
+	SCCP_PAR_Address sccp_addr_bsc optional,
+	SCCP_PAR_Address sccp_addr_smlc optional
+};
+
+/* Note: Do not use valueof() to get a value of this template, use
+ * f_gen_test_hdlr_pars() instead in order to get a configuration that is
+ * matched to the current test situation (aoip vs. sccplite) */
+template (value) TestHdlrParams t_def_TestHdlrPars := {
+	imsi := '001019876543210'H,
+	bssap_le_idx := 0,
+	sccp_addr_bsc := omit,
+	sccp_addr_smlc := omit
+}
+
+}