diff --git a/lib/include/srslte/interfaces/rrc_interface_types.h b/lib/include/srslte/interfaces/rrc_interface_types.h
index d4412bbd0..caaa532a1 100644
--- a/lib/include/srslte/interfaces/rrc_interface_types.h
+++ b/lib/include/srslte/interfaces/rrc_interface_types.h
@@ -256,6 +256,40 @@ public:
     rlc_cfg.am.t_status_prohibit = 0;
     return rlc_cfg;
   }
+  static rlc_config_t default_rlc_um_config(uint32_t sn_size = 10)
+  {
+    rlc_config_t cnfg;
+    cnfg.rlc_mode        = rlc_mode_t::um;
+    cnfg.um.t_reordering = 5;
+    if (sn_size == 10) {
+      cnfg.um.rx_sn_field_length = rlc_umd_sn_size_t::size10bits;
+      cnfg.um.rx_window_size     = 512;
+      cnfg.um.rx_mod             = 1024;
+      cnfg.um.tx_sn_field_length = rlc_umd_sn_size_t::size10bits;
+      cnfg.um.tx_mod             = 1024;
+    } else if (sn_size == 5) {
+      cnfg.um.rx_sn_field_length = rlc_umd_sn_size_t::size5bits;
+      cnfg.um.rx_window_size     = 16;
+      cnfg.um.rx_mod             = 32;
+      cnfg.um.tx_sn_field_length = rlc_umd_sn_size_t::size5bits;
+      cnfg.um.tx_mod             = 32;
+    } else {
+      return {};
+    }
+    return cnfg;
+  }
+  static rlc_config_t default_rlc_am_config()
+  {
+    rlc_config_t rlc_cnfg;
+    rlc_cnfg.rlc_mode             = rlc_mode_t::am;
+    rlc_cnfg.am.t_reordering      = 5;
+    rlc_cnfg.am.t_status_prohibit = 5;
+    rlc_cnfg.am.max_retx_thresh   = 4;
+    rlc_cnfg.am.poll_byte         = 25;
+    rlc_cnfg.am.poll_pdu          = 4;
+    rlc_cnfg.am.t_poll_retx       = 5;
+    return rlc_cnfg;
+  }
 };
 } // namespace srslte
 
diff --git a/lib/test/upper/rlc_am_test.cc b/lib/test/upper/rlc_am_test.cc
index 99fa0b2f8..aa3bbcd1d 100644
--- a/lib/test/upper/rlc_am_test.cc
+++ b/lib/test/upper/rlc_am_test.cc
@@ -129,19 +129,6 @@ private:
   bool running;
 };
 
-rlc_config_t default_rlc_cnfg()
-{
-  rlc_config_t rlc_cnfg;
-  rlc_cnfg.rlc_mode             = rlc_mode_t::am;
-  rlc_cnfg.am.t_reordering      = 5;
-  rlc_cnfg.am.t_status_prohibit = 5;
-  rlc_cnfg.am.max_retx_thresh   = 4;
-  rlc_cnfg.am.poll_byte         = 25;
-  rlc_cnfg.am.poll_pdu          = 4;
-  rlc_cnfg.am.t_poll_retx       = 5;
-  return rlc_cnfg;
-}
-
 void basic_test_tx(rlc_am* rlc, byte_buffer_t pdu_bufs[NBUFS])
 {
 
@@ -182,11 +169,11 @@ bool basic_test()
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -241,11 +228,11 @@ bool concat_test()
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -307,11 +294,11 @@ bool segment_test(bool in_seq_rx)
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -401,11 +388,11 @@ bool retx_test()
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -494,11 +481,11 @@ bool resegment_test_1()
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -600,11 +587,11 @@ bool resegment_test_2()
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -702,11 +689,11 @@ bool resegment_test_3()
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -799,11 +786,11 @@ bool resegment_test_4()
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -898,11 +885,11 @@ bool resegment_test_5()
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -998,11 +985,11 @@ bool resegment_test_6()
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -1134,11 +1121,11 @@ bool resegment_test_7()
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -1307,11 +1294,11 @@ bool resegment_test_8()
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
   rlc_am rlc2(&log2, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
-  if (not rlc2.configure(default_rlc_cnfg())) {
+  if (not rlc2.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -1451,7 +1438,7 @@ bool reset_test()
 
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -1496,7 +1483,7 @@ bool resume_test()
 
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
@@ -1540,7 +1527,7 @@ bool stop_test()
 
   rlc_am rlc1(&log1, 1, &tester, &tester, &timers);
 
-  if (not rlc1.configure(default_rlc_cnfg())) {
+  if (not rlc1.configure(rlc_config_t::default_rlc_am_config())) {
     return -1;
   }
 
diff --git a/lib/test/upper/rlc_um_test.cc b/lib/test/upper/rlc_um_test.cc
index 4730516eb..55d0abc74 100644
--- a/lib/test/upper/rlc_um_test.cc
+++ b/lib/test/upper/rlc_um_test.cc
@@ -94,28 +94,6 @@ public:
   uint32_t expected_sdu_len;
 };
 
-srslte::rlc_config_t make_rlc_cnfg_default(uint32_t sn)
-{
-  rlc_config_t cnfg;
-  cnfg.rlc_mode        = rlc_mode_t::um;
-  cnfg.um.t_reordering = 5;
-  if (sn == 10) {
-    cnfg.um.rx_sn_field_length = rlc_umd_sn_size_t::size10bits;
-    cnfg.um.rx_window_size     = 512;
-    cnfg.um.rx_mod             = 1024;
-    cnfg.um.tx_sn_field_length = rlc_umd_sn_size_t::size10bits;
-    cnfg.um.tx_mod             = 1024;
-  } else if (sn == 5) {
-    cnfg.um.rx_sn_field_length = rlc_umd_sn_size_t::size5bits;
-    cnfg.um.rx_window_size     = 16;
-    cnfg.um.rx_mod             = 32;
-    cnfg.um.tx_sn_field_length = rlc_umd_sn_size_t::size5bits;
-    cnfg.um.tx_mod             = 32;
-  } else {
-    printf("NOT supported\n");
-  }
-  return cnfg;
-}
 
 int basic_test()
 {
@@ -132,7 +110,7 @@ int basic_test()
   rlc_um rlc1(&log1, 3, &tester, &tester, &timers);
   rlc_um rlc2(&log2, 3, &tester, &tester, &timers);
 
-  rlc_config_t cnfg          = make_rlc_cnfg_default(10);
+  rlc_config_t cnfg          = rlc_config_t::default_rlc_um_config(10);
   cnfg.rlc_mode              = rlc_mode_t::um;
   cnfg.um.t_reordering       = 5;
   cnfg.um.rx_sn_field_length = rlc_umd_sn_size_t::size10bits;
@@ -202,7 +180,7 @@ int loss_test()
   rlc_um rlc1(&log1, 3, &tester, &tester, &timers);
   rlc_um rlc2(&log2, 3, &tester, &tester, &timers);
 
-  rlc_config_t cnfg = make_rlc_cnfg_default(10);
+  rlc_config_t cnfg = rlc_config_t::default_rlc_um_config(10);
 
   rlc1.configure(cnfg);
   rlc2.configure(cnfg);
@@ -335,7 +313,7 @@ int reassmble_test()
   rlc_um rlc1(&log1, 3, &tester, &tester, &timers);
   rlc_um rlc2(&log2, 3, &tester, &tester, &timers);
 
-  rlc_config_t cnfg = make_rlc_cnfg_default(5);
+  rlc_config_t cnfg = rlc_config_t::default_rlc_um_config(5);
 
   rlc1.configure(cnfg);
   rlc2.configure(cnfg);
@@ -444,7 +422,7 @@ int reassmble_test2()
   rlc_um rlc1(&log1, 3, &tester, &tester, &timers);
   rlc_um rlc2(&log2, 3, &tester, &tester, &timers);
 
-  rlc_config_t cnfg = make_rlc_cnfg_default(5);
+  rlc_config_t cnfg = rlc_config_t::default_rlc_um_config(5);
 
   rlc1.configure(cnfg);
   rlc2.configure(cnfg);