diff --git a/ci-scripts/xml_files/fr1_multi_node_test.xml b/ci-scripts/xml_files/fr1_multi_node_test.xml
index 31a703793f..d35dd74c2b 100644
--- a/ci-scripts/xml_files/fr1_multi_node_test.xml
+++ b/ci-scripts/xml_files/fr1_multi_node_test.xml
@@ -46,8 +46,8 @@
 
 	<testCase id="040000">
 		<class>Initialize_eNB</class>
-		<desc>Initialize gNB</desc>
-		<Initialize_eNB_args>-O ci-scripts/conf_files/gnb.band78.tm1.fr1.106PRB.usrpb210.conf</Initialize_eNB_args>
+		<desc>Initialize gNB (3/4 sampling rate)</desc>
+		<Initialize_eNB_args>-O ci-scripts/conf_files/gnb.band78.tm1.fr1.106PRB.usrpb210.conf -E</Initialize_eNB_args>
 		<eNB_instance>1</eNB_instance>
 		<eNB_serverId>1</eNB_serverId>
 		<air_interface>nr</air_interface>
diff --git a/doc/TESTING_GNB_W_COTS_UE.md b/doc/TESTING_GNB_W_COTS_UE.md
index d2f167164a..a16b4dbe13 100644
--- a/doc/TESTING_GNB_W_COTS_UE.md
+++ b/doc/TESTING_GNB_W_COTS_UE.md
@@ -216,26 +216,20 @@ Execute:
 
 ```
 
-For example:
-```
-~/openairinterface5g/cmake_targets/ran_build/build$ sudo ./lte-softmodem -O ../../../targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.50PRB.usrpb210.conf | tee mylogfile.log
-```
-
-
 
 - **gNB** (on the gNB host)
 
 
 Execute: 
 ```
-~/openairinterface5g/cmake_targets/ran_build/build$ sudo ./nr-softmodem -O **YOUR_GNB_CONF_FILE** | tee **YOUR_LOG_FILE**
+~/openairinterface5g/cmake_targets/ran_build/build$ sudo ./nr-softmodem -O **YOUR_GNB_CONF_FILE** -E | tee **YOUR_LOG_FILE**
 
 ```
 
-For example:
-```
-~/openairinterface5g/cmake_targets/ran_build/build$ sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpn300.conf | tee mylogfile.log
-```
+**ATTENTION** : for the gNB execution,    
+The -E option is required to enable the tri-quarter sampling rate when using a B2xx serie USRP  
+The -E opton is not needed when using a a N300 USRP  
+
 
 
 ## Test Case