Services provided to the Network Layer
- data-link-connection;
- data-link-service-data-units;
- data-link-connection-endpoint-identifiers;
- sequencing
- error notification;
- flow control;
- quality of service parameters.
Functions within the Data Link Layer
- data-link-connection establishment and release;
- data-link-service-data-unit mapping;
- data-link-connection splitting;
- delimiting and synchronisation;
- sequence control;
- error detection;
- error recovery;
- flow control;
- Identification and parameter exchange;
- control of data-circuit interconnection;
- Data link layer management
