diff --git a/py-scripts/test_l3.py b/py-scripts/test_l3.py
index b3a403050..2ca8628b6 100755
--- a/py-scripts/test_l3.py
+++ b/py-scripts/test_l3.py
@@ -3397,6 +3397,22 @@ def monitor(self, ul, dl, ul_pdu_str, dl_pdu_str, atten_val, coordinate, rotatio
                 return data
         return total_dl_bps, total_ul_bps, total_dl_ll_bps, total_ul_ll_bps
 
+    @staticmethod
+    def normalize_signal_channel(port_data):
+        # Normalize RSSI / Channel so the port CSV columns keep a single dtype.
+        sig_str = str(port_data.get('signal', '')).strip()
+        signal_val = sig_str.split(" ")[0] if "dBm" in sig_str else sig_str
+
+        chan_str = str(port_data.get('channel', '')).strip()
+        if chan_str in ('', '0', '-1'):
+            channel_val = 'NA'
+        elif '[channel:' in chan_str:
+            channel_val = chan_str.split(':')[1].replace(']', '').strip()
+        else:
+            channel_val = chan_str
+
+        return signal_val, channel_val
+
     def write_dl_port_csv(
             self,
             sta_count,
@@ -3424,15 +3440,17 @@ def write_dl_port_csv(
                atten, port_eid
                ]
 
+        signal_val, channel_val = self.normalize_signal_channel(port_data)
+
         row = row + [port_data['bps rx'],
                      port_data['bps tx'],
                      port_data['rx-rate'],
                      port_data['tx-rate'],
-                     port_data['signal'],
+                     signal_val,
                      port_data['ap'],
                      port_data['mode'],
                      port_data['mac'],
-                     port_data['channel'],
+                     channel_val,
                      latency,
                      jitter,
                      total_ul_rate,
@@ -3486,15 +3504,17 @@ def write_ul_port_csv(
                atten, port_eid
                ]
 
+        signal_val, channel_val = self.normalize_signal_channel(port_data)
+
         row = row + [port_data['bps rx'],
                      port_data['bps tx'],
                      port_data['rx-rate'],
                      port_data['tx-rate'],
-                     port_data['signal'],
+                     signal_val,
                      port_data['ap'],
                      port_data['mode'],
                      port_data['mac'],
-                     port_data['channel'],
+                     channel_val,
                      latency,
                      jitter,
                      total_ul_rate,