162306a36Sopenharmony_ci# SPDX-License-Identifier: GPL-2.0-only 262306a36Sopenharmony_ci# 362306a36Sopenharmony_ci# LAPB Data Link Drive 462306a36Sopenharmony_ci# 562306a36Sopenharmony_ci 662306a36Sopenharmony_ciconfig LAPB 762306a36Sopenharmony_ci tristate "LAPB Data Link Driver" 862306a36Sopenharmony_ci help 962306a36Sopenharmony_ci Link Access Procedure, Balanced (LAPB) is the data link layer (i.e. 1062306a36Sopenharmony_ci the lower) part of the X.25 protocol. It offers a reliable 1162306a36Sopenharmony_ci connection service to exchange data frames with one other host, and 1262306a36Sopenharmony_ci it is used to transport higher level protocols (mostly X.25 Packet 1362306a36Sopenharmony_ci Layer, the higher part of X.25, but others are possible as well). 1462306a36Sopenharmony_ci Usually, LAPB is used with specialized X.21 network cards, but Linux 1562306a36Sopenharmony_ci currently supports LAPB only over Ethernet connections. If you want 1662306a36Sopenharmony_ci to use LAPB connections over Ethernet, say Y here and to "LAPB over 1762306a36Sopenharmony_ci Ethernet driver" below. Read 1862306a36Sopenharmony_ci <file:Documentation/networking/lapb-module.rst> for technical 1962306a36Sopenharmony_ci details. 2062306a36Sopenharmony_ci 2162306a36Sopenharmony_ci To compile this driver as a module, choose M here: the 2262306a36Sopenharmony_ci module will be called lapb. If unsure, say N. 23