Definitions for "LAPB"
See Link Access Procedure, Balanced.
(link access procedure balanced) X.25 represents Levels 2 and 3 of the OSI reference model; LAPB is the protocol that implements Level 2. This protocol provides a mechanism to exchange data (frames), detect out-of-sequence or missing frames, and provide for retransmission and acknowledgment.
Link Access Protocol - B Channel. Standard protocol for ISDN that defines the data in the 2 voice ("B") channels of the 192 kbps ISDN signal.