diff --git a/df_datalink_sp/src/networking/link_layer/scan.c b/df_datalink_sp/src/networking/link_layer/scan.c
index 77ce0b6..1776942 100644
--- a/df_datalink_sp/src/networking/link_layer/scan.c
+++ b/df_datalink_sp/src/networking/link_layer/scan.c
@@ -26,7 +26,9 @@
 
 /************************** Constant Definitions *****************************/
 #define ADV_LISTEN_TIMEOUT 40
-#define CFM_LISTEN_TIMEOUT 40
+#define CFM_LISTEN_TIMEOUT 25
+#define ADV_FRAME_SLOTS 4
+#define CFM_FRAME_SLOTS 4
 /***************** Macros (In-line Functions) Definitions *********************/
 
 /**************************** Type Definitions *******************************/
@@ -193,15 +195,16 @@ static int32_t Scan_CfmHandler(L2_INST *instPtr)
 	{
 		DBG_WARNING("Cmf timeout, restart net scan from L2_SCAN_INIT_STAGE.\n");
 		L2_Scan_Reset(scanFsmPtr);
+		return SUCCESS;
 	}
-	else
+	if (L2_GetNextSlotNum(instPtr) % CFM_FRAME_SLOTS == 0)
 	{
+		// using pull mode to receive confirm frame
+		// since first time sync procedure is accomplished in ADV stage.
+		Phy_SetMode(instPtr->config.phyInstPtr, PHY_MODE_PULL);
+		L2_SetupNextSlot(instPtr, L2_TOR_RX, L2_CFM_FRAME);
 		scanFsmPtr->cfmTimeout++; // increase counter.
 	}
-	// using pull mode to receive confirm frame
-	// since first time sync procedure is accomplished in BM stage.
-	Phy_SetMode(instPtr->config.phyInstPtr, PHY_MODE_PULL);
-	L2_SetupNextSlot(instPtr, L2_TOR_RX, L2_CFM_FRAME);
 	return SUCCESS;
 }