01xx	CURRENT CLASS
0101	Start Time/Program ID (current)
0102	Program Length/Time in Show (current)
0103	Program Name (current)
0104	Program Types (current)
0105	Program Rating "V-Chip" (current)
0106	Audio Streams (current)
0107	Caption Streams (current)
0108	Copy Generation Management System "CGMS" (current)
0109	Program Aspect Ratio (current)
010C	Program Data (current)
010D	Miscellaneous Data (current)
0110	Program Description [up to eight lines] (current)

03xx	FUTURE CLASS
0301	Start Time/Program ID (future)
0302	Program Length/Time in Show (future)
0303	Program Name (future)
0304	Program Types (future)
0305	Program Rating "V-Chip" (future)
0306	Audio Streams (future)
0307	Caption Streams (future)
0308	Copy Generation Management System "CGMS" (future)
0309	Program Aspect Ratio (future)
030C	Program Data (future)
030D	Miscellaneous Data (future)
0310	Program Description [up to eight lines] (future)

05xx	CHANNEL CLASS
0501	Network Name
0502	Network Call Letters
0503	Channel Tape Delay
0504	Transmission Signal Identifier "TSID"

07xx	CHANNEL CLASS
0701	Time of Day
0702	Impulse Capture ID
0703	Supplemental Data Location
0704	Local Time Zone
0740	Out of Band Channel
0741	Channel Map Pointer
0742	Channel Map Header
0743	Channel Map

09xx	PUBLIC SERVICE CLASS
0901	National Weather Service Bulletin
0902	National Weather Service Message

0Bxx	RESERVED CLASS

0Dxx	UNDEFINED CLASS