LLC PCI

IEEE 802.2 - Logical Link Control

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LLC is some kind of adaption layer between MAC layer and upper layer protocols. It is capable of connectionless and connection-oriented services.

LLC was designed especially for compatibility reasons concerning Ethernet and Token-Ring; it has been derived from SDLC and is similar to HDLC.

The length of LLC PDUs depend on the used LLC type. The minimum LLC header length is 3 bytes.

> LLC type 1: connectionless (CLLS)

> LLC type 2: connection oriented (COLS)

> LLC type 3: acknowledged connectionless

LLC is similar to SDLC and HDLC. LLC and HDLC use the same control field codes.

A LLC-PDU as called LPDU.