diff --git a/srsenb/rb.conf.example b/srsenb/rb.conf.example
index 18bb0f861..010599f29 100644
--- a/srsenb/rb.conf.example
+++ b/srsenb/rb.conf.example
@@ -95,39 +95,39 @@ qci_config = (
 );
 
 // 5G Section
-// srb1_5g_config = {
-//  rlc_config = {
-//    ul_am = {
-//      sn_field_len = 12;
-//      t_poll_retx = 50;
-//      poll_pdu = 4;
-//      poll_byte = 3000;
-//      max_retx_thres = 4;
-//    };
-//    dl_am = {
-//      sn_field_len = 12;
-//      t_reassembly = 50;
-//      t_status_prohibit = 50;
-//    };
-//  };
-// }
+srb1_5g_config = {
+ rlc_config = {
+   ul_am = {
+     sn_field_len = 12;
+     t_poll_retx = 45;
+     poll_pdu = -1;
+     poll_byte = -1;
+     max_retx_thres = 8;
+   };
+   dl_am = {
+     sn_field_len = 12;
+     t_reassembly = 35;
+     t_status_prohibit = 10;
+   };
+ };
+}
 
-// srb2_5g_config = {
-//  rlc_config = {
-//    ul_am = {
-//      sn_field_len = 12;
-//      t_poll_retx = 50;
-//      poll_pdu = 4;
-//      poll_byte = 3000;
-//      max_retx_thres = 4;
-//    };
-//    dl_am = {
-//      sn_field_len = 12;
-//      t_reassembly = 50;
-//      t_status_prohibit = 50;
-//    };
-//  };
-// }
+srb2_5g_config = {
+ rlc_config = {
+   ul_am = {
+     sn_field_len = 12;
+     t_poll_retx = 45;
+     poll_pdu = -1;
+     poll_byte = -1;
+     max_retx_thres = 8;
+   };
+   dl_am = {
+     sn_field_len = 12;
+     t_reassembly = 35;
+     t_status_prohibit = 10;
+   };
+ };
+}
 
 five_qi_config = (
 {
diff --git a/srsenb/src/enb_cfg_parser.cc b/srsenb/src/enb_cfg_parser.cc
index 6714691b5..909362ad8 100644
--- a/srsenb/src/enb_cfg_parser.cc
+++ b/srsenb/src/enb_cfg_parser.cc
@@ -2467,6 +2467,12 @@ int parse_rb(all_args_t* args_, rrc_cfg_t* rrc_cfg_, rrc_nr_cfg_t* rrc_nr_cfg_)
   if (not srb2_present) {
     rrc_cfg_->srb2_cfg.rlc_cfg.set_default_value();
   }
+
+  if (!srb1_5g_present || !srb2_5g_present) {
+    fprintf(stderr, "Optional 5G SRB configuration is not supported yet.\n");
+    fprintf(stderr, "Please specify 5G SRB1 and SRB2 configuration.\n");
+    return SRSRAN_ERROR;
+  }
   rrc_nr_cfg_->srb1_cfg.present = srb1_5g_present;
   rrc_nr_cfg_->srb2_cfg.present = srb1_5g_present;