Logical Link Control
LLC
Die Abkürzung LLC steht für Logical Link Control.
Das LLC- Protokoll lehnt sich an das bitorientirte HDLC- Protokoll an. LLC Benutzt jedoch nur den Asynchronous Balanced Mode (AMB), somit kann jede Station Primärstation sein.
LLC-Rahmentypen
U-Frames
unnumbered frames |
SABME
set asynchronnous balanced mode extended |
Command
|
DM
disconnectd mode |
Response
|
|
DISC
disconnect
|
Command
|
|
UA unnumbered acknowledge
|
Response
|
|
FRMR
frame reject
|
Response
|
|
TEST
test |
Command / Response
|
|
UI
unnumbered information |
Command
|
|
XID
exchange identifier |
Command
|
|
S-Frames supervisory frames |
RR receive ready |
Command / Response |
RNR receive not ready |
||
REJ reject |
||
I-Frame
information frame |
I
information |
Command
|