diff --git a/library/GSM_Types.ttcn b/library/GSM_Types.ttcn
index d954962..e7d8a7c 100644
--- a/library/GSM_Types.ttcn
+++ b/library/GSM_Types.ttcn
@@ -32,7 +32,8 @@
 /* ARFCN with explicit band discrimination */
 type record GsmBandArfcn {
 	boolean		pcs,
-	BIT5		spare,
+	boolean		uplink,
+	BIT4		spare,
 	GsmArfcn	arfcn
 } with {
 	variant (arfcn) "BYTEORDER(last)"
@@ -41,15 +42,19 @@
 
 template (value) GsmBandArfcn
 ts_GsmBandArfcn(template (value) GsmArfcn arfcn,
-		template (value) boolean pcs := false) := {
+		template (value) boolean pcs := false,
+		template (value) boolean uplink := false) := {
 	pcs := pcs,
-	spare := '00000'B,
+	uplink := uplink,
+	spare := '0000'B,
 	arfcn := arfcn
 };
 template GsmBandArfcn
 tr_GsmBandArfcn(template (present) GsmArfcn arfcn,
-		template (present) boolean pcs := ?) := {
+		template (present) boolean pcs := ?,
+		template (present) boolean uplink := ?) := {
 	pcs := pcs,
+	uplink := uplink,
 	spare := ?,
 	arfcn := arfcn
 };