diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp
index b2a2b6c..2376e3d 100644
--- a/Transceiver52M/Transceiver.cpp
+++ b/Transceiver52M/Transceiver.cpp
@@ -274,6 +274,9 @@
     else
       return TSC;
     break;
+  case XIII:
+    return TSC;
+      break;
   default:
     return OFF;
     break;
diff --git a/Transceiver52M/Transceiver.h b/Transceiver52M/Transceiver.h
index 4a84e27..8df29e5 100644
--- a/Transceiver52M/Transceiver.h
+++ b/Transceiver52M/Transceiver.h
@@ -87,7 +87,11 @@
     VI,                 ///< CCCH+BCCH, uplink RACH
     VII,                ///< SDCCH/8 + SACCH/8
     NONE,               ///< Channel is inactive, default
-    LOOPBACK            ///< similar go VII, used in loopback testing
+    LOOPBACK,           ///< similar go VII, used in loopback testing
+    X,
+    XI,
+    XII,
+    XIII
   } ChannelCombination;