[next] [prev] [prev-tail] [tail] [up]
- Regulate addressing of stations
- Controls the transmission between the end stations.
- The service address points (SAPs) identify the applications/users involved
- One bit of the destination SAP indicates whether the address is of an individual station or a group.
- One bit of the sender SAP indicates whether the PDU is a command or a response
PDU.
- Unacknowledged connectionless
- Simple service without flow- and error- control mechanism.
Improves efficiency in cases that error- and control-flow are provided by higher levels, and in cases
they are not important.
- Connection oriented
- Provides flow- and error-control.
Useful for simple devices that have little software operating above the current level.
- Acknowledged
connectionless
[next] [prev] [prev-tail] [front] [up]