diff --git a/library/L1CTL_Types.ttcn b/library/L1CTL_Types.ttcn
index 192091e..fe56459 100644
--- a/library/L1CTL_Types.ttcn
+++ b/library/L1CTL_Types.ttcn
@@ -127,8 +127,11 @@
 		L1CTL_CHAN_MODE_SIGN		('00000000'B),	/* Signalling */
 		L1CTL_CHAN_MODE_SPEECH_V1	('00000001'B),	/* FR or HR codec */
 		L1CTL_CHAN_MODE_SPEECH_V2	('00100001'B),	/* EFR codec */
-		L1CTL_CHAN_MODE_SPEECH_V3	('01000001'B)	/* AMR codec */
-		/* Other modes are not supported for now */
+		L1CTL_CHAN_MODE_SPEECH_V3	('01000001'B),	/* AMR codec */
+		L1CTL_CHAN_MODE_DATA_14k5	('00001111'B),	/* CSD: TCH/F14.4 */
+		L1CTL_CHAN_MODE_DATA_12k0	('00000011'B),	/* CSD: TCH/F9.6 */
+		L1CTL_CHAN_MODE_DATA_6k0	('00001011'B),	/* CSD: TCH/{FH}4.8 */
+		L1CTL_CHAN_MODE_DATA_3k6	('00010011'B)	/* CSD: TCH/{FH}2.4 */
 	} with { variant "FIELDLENGTH(8)" };
 
 	type enumerated L1ctlLoopMode {