diff --git a/executables/lte-enb.c b/executables/lte-enb.c
index 477ff5cd68..39f72db86c 100644
--- a/executables/lte-enb.c
+++ b/executables/lte-enb.c
@@ -568,7 +568,7 @@ int wakeup_rxtx(PHY_VARS_eNB *eNB,
   LTE_DL_FRAME_PARMS *fp = &eNB->frame_parms;
   int ret;
   LOG_D(PHY,"ENTERED wakeup_rxtx, %d.%d\n",ru_proc->frame_rx,ru_proc->tti_rx);
-  // wake up TX for subframe n+sl_ahead
+  // wake up TX for subframe n+sf_ahead
   // lock the TX mutex and make sure the thread is ready
   AssertFatal((ret=pthread_mutex_lock(&L1_proc->mutex)) == 0,"mutex_lock returns %d\n", ret);
 
diff --git a/executables/nr-ru.c b/executables/nr-ru.c
index d608415e7e..d87acf1bbe 100644
--- a/executables/nr-ru.c
+++ b/executables/nr-ru.c
@@ -68,7 +68,6 @@ static int DEFRUTPCORES[] = {-1,-1,-1,-1};
 #include <nfapi/oai_integration/vendor_ext.h>
 #include "executables/nr-softmodem-common.h"
 
-int sl_ahead;
 static void NRRCconfig_RU(configmodule_interface_t *cfg);
 
 /*************************************************************/
diff --git a/executables/nr-uesoftmodem.c b/executables/nr-uesoftmodem.c
index d5896bbffd..d3362a4851 100644
--- a/executables/nr-uesoftmodem.c
+++ b/executables/nr-uesoftmodem.c
@@ -99,7 +99,6 @@ nrUE_params_t nrUE_params = {0};
 pthread_cond_t nfapi_sync_cond;
 pthread_mutex_t nfapi_sync_mutex;
 int nfapi_sync_var=-1; //!< protected by mutex \ref nfapi_sync_mutex
-int sf_ahead = 6; //??? value ???
 pthread_cond_t sync_cond;
 pthread_mutex_t sync_mutex;
 int sync_var=-1; //!< protected by mutex \ref sync_mutex.
diff --git a/executables/softmodem-common.h b/executables/softmodem-common.h
index e593a78210..2e7aaacc21 100644
--- a/executables/softmodem-common.h
+++ b/executables/softmodem-common.h
@@ -352,7 +352,6 @@ void set_softmodem_sighandler(void);
 extern uint64_t downlink_frequency[MAX_NUM_CCs][4];
 extern int32_t uplink_frequency_offset[MAX_NUM_CCs][4];
 extern int usrp_tx_thread;
-extern int sl_ahead;
 extern int sf_ahead;
 extern int oai_exit;
 
diff --git a/openair1/SIMULATION/NR_PHY/dlsim.c b/openair1/SIMULATION/NR_PHY/dlsim.c
index 95a5b9ea64..236913d3f8 100644
--- a/openair1/SIMULATION/NR_PHY/dlsim.c
+++ b/openair1/SIMULATION/NR_PHY/dlsim.c
@@ -107,7 +107,6 @@ int32_t uplink_frequency_offset[MAX_NUM_CCs][4];
 double cpuf;
 char *uecap_file;
 
-int sl_ahead = 0;
 //uint8_t nfapi_mode = 0;
 uint64_t downlink_frequency[MAX_NUM_CCs][4];
 THREAD_STRUCT thread_struct;
diff --git a/openair1/SIMULATION/NR_PHY/prachsim.c b/openair1/SIMULATION/NR_PHY/prachsim.c
index 5eab1c6974..39e692fba9 100644
--- a/openair1/SIMULATION/NR_PHY/prachsim.c
+++ b/openair1/SIMULATION/NR_PHY/prachsim.c
@@ -83,7 +83,6 @@ openair0_config_t openair0_cfg[MAX_CARDS];
 //uint8_t nfapi_mode=0;
 uint64_t downlink_frequency[MAX_NUM_CCs][4];
 int32_t uplink_frequency_offset[MAX_NUM_CCs][4];
-int sl_ahead = 0;
 uint32_t N_RB_DL = 106;
 
 NR_IF_Module_t *NR_IF_Module_init(int Mod_id) { return (NULL); }
diff --git a/openair1/SIMULATION/NR_PHY/ulsim.c b/openair1/SIMULATION/NR_PHY/ulsim.c
index ffc6690b42..301beb19f5 100644
--- a/openair1/SIMULATION/NR_PHY/ulsim.c
+++ b/openair1/SIMULATION/NR_PHY/ulsim.c
@@ -106,9 +106,6 @@ RAN_CONTEXT_t RC;
 char *uecap_file;
 int32_t uplink_frequency_offset[MAX_NUM_CCs][4];
 
-int sf_ahead = 4;
-int slot_ahead=6 ;
-int sl_ahead = 0;
 double cpuf;
 //uint8_t nfapi_mode = 0;
 uint64_t downlink_frequency[MAX_NUM_CCs][4];
diff --git a/radio/ETHERNET/benetel/5g/benetel.c b/radio/ETHERNET/benetel/5g/benetel.c
index 90fce2e206..996d568767 100644
--- a/radio/ETHERNET/benetel/5g/benetel.c
+++ b/radio/ETHERNET/benetel/5g/benetel.c
@@ -257,7 +257,6 @@ printf("rxdata in benetel_fh_if4p5_south_in %p\n", &ru->common.rxdataF[antenna][
   //printf("BENETEL: %s (f.sf %d.%d)\n", __FUNCTION__, *frame, *slot);
 
   RU_proc_t *proc = &ru->proc;
-  extern int sl_ahead;
   int f = *frame;
   int sl = *slot;
 
@@ -272,8 +271,8 @@ printf("rxdata in benetel_fh_if4p5_south_in %p\n", &ru->common.rxdataF[antenna][
 
   if (get_nprocs()<=4) {
     // why? what if there are more?
-    proc->tti_tx   = (sl+sl_ahead)%20;
-    proc->frame_tx = (sl>(19-sl_ahead)) ? (f+1)&1023 : f;
+    proc->tti_tx   = (sl+ru->sl_ahead)%20;
+    proc->frame_tx = (sl>(19-ru->sl_ahead)) ? (f+1)&1023 : f;
   }
 }
 
diff --git a/radio/fhi_72/oran_isolate.c b/radio/fhi_72/oran_isolate.c
index f922df40bb..d3f4fa1796 100644
--- a/radio/fhi_72/oran_isolate.c
+++ b/radio/fhi_72/oran_isolate.c
@@ -203,7 +203,6 @@ void oran_fh_if4p5_south_in(RU_t *ru, int *frame, int *slot)
   ru_info.prach_buf = ru->prach_rxsigF[0]; // index: [prach_oca][ant_id]
 
   RU_proc_t *proc = &ru->proc;
-  extern int sl_ahead;
   int f, sl;
   LOG_D(PHY, "Read rxdataF %p,%p\n", ru_info.rxdataF[0], ru_info.rxdataF[1]);
   start_meas(&ru->rx_fhaul);
@@ -217,8 +216,8 @@ void oran_fh_if4p5_south_in(RU_t *ru, int *frame, int *slot)
   int slots_per_frame = 10 << (ru->openair0_cfg.nr_scs_for_raster);
   proc->tti_rx = sl;
   proc->frame_rx = f;
-  proc->tti_tx = (sl + sl_ahead) % slots_per_frame;
-  proc->frame_tx = (sl > (slots_per_frame - 1 - sl_ahead)) ? (f + 1) & 1023 : f;
+  proc->tti_tx = (sl + ru->sl_ahead) % slots_per_frame;
+  proc->frame_tx = (sl > (slots_per_frame - 1 - ru->sl_ahead)) ? (f + 1) & 1023 : f;
 
   if (proc->first_rx == 0) {
     if (proc->tti_rx != *slot) {