The DVB and ATSC standards have 2 packet types that send time and date information to the receiver.

Only a small fraction of the available packet types have been defined; this enables the system to grow and incorporate advances.

Almost all packet types contain a parameter flagging whether its information is relevant for the "nominal" or "reverse" direction (or both).

PID field value indicates header compression protocol type used and packet type or CID.

The two packet types provide the 1-bit sequence number required by Stop-and-wait ARQ.

APRS contains a number of packet types including position/object/item, status, messages, queries, weather reports and telemetry.

A 8-bit field that states the packet type.

B Plus defined several different packet types, as opposed to most protocols which included only one.

Examples include the following: blocking of all unnecessary outgoing ICMP traffic, especially unusual packet types like address masks and timestamps.

Thus the original packet types could vary within each different protocol.