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LAPF - Telecommunications
LAPF , or Link Access Procedure to Frame Mode Bearer Services (FR, ISDN), is a modified LAPD standard for Frame Relay. It provides capabilities to establish and release data link connections, transfer acknowledged and unacknowledged data, flow control the transfer of data, and reinitialize the data link connection on detecting an error.
The format of the header is shown in the following illustration.
8 7 6 5 4 3 2 1
Default address field format
Upper DLCI C/R EA
Lower DLCI FECN
Address field extension bit.
Command Response bit.
Forward Explicit Congestion Notification.
Backward Explicit Congestion Notification.
Data Link Connection Identifier.
Discard Eligibility indicator.