adding time_source = "external"

targets/PROJECTS/GENERIC-LTE-EPC/CONF/testing_enb.conf

+
 Active_eNBs = ( "eNB-Eurecom-LTEBox");
 # Asn1_verbosity, choice in: none, info, annoying
 Asn1_verbosity = "none";
@@ -259,6 +260,8 @@ RUs = (
          max_rxgain                    = 118;
          eNB_instances  = [0];
          clock_src = "external";
+         time_src = "external";
+	 #if_freq = 400000000L;
     }
 );  
 

targets/PROJECTS/GENERIC-LTE-EPC/CONF/testing_gnb.conf

@@ -260,6 +260,7 @@ RUs = (
          max_rxgain                    = 114;
          eNB_instances  = [0];
          clock_src = "external";
+         time_src = "external";
     }
 );