18c2ecf20Sopenharmony_ci# SPDX-License-Identifier: GPL-2.0-only 28c2ecf20Sopenharmony_ci# 38c2ecf20Sopenharmony_ci# LAPB Data Link Drive 48c2ecf20Sopenharmony_ci# 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ciconfig LAPB 78c2ecf20Sopenharmony_ci tristate "LAPB Data Link Driver" 88c2ecf20Sopenharmony_ci help 98c2ecf20Sopenharmony_ci Link Access Procedure, Balanced (LAPB) is the data link layer (i.e. 108c2ecf20Sopenharmony_ci the lower) part of the X.25 protocol. It offers a reliable 118c2ecf20Sopenharmony_ci connection service to exchange data frames with one other host, and 128c2ecf20Sopenharmony_ci it is used to transport higher level protocols (mostly X.25 Packet 138c2ecf20Sopenharmony_ci Layer, the higher part of X.25, but others are possible as well). 148c2ecf20Sopenharmony_ci Usually, LAPB is used with specialized X.21 network cards, but Linux 158c2ecf20Sopenharmony_ci currently supports LAPB only over Ethernet connections. If you want 168c2ecf20Sopenharmony_ci to use LAPB connections over Ethernet, say Y here and to "LAPB over 178c2ecf20Sopenharmony_ci Ethernet driver" below. Read 188c2ecf20Sopenharmony_ci <file:Documentation/networking/lapb-module.rst> for technical 198c2ecf20Sopenharmony_ci details. 208c2ecf20Sopenharmony_ci 218c2ecf20Sopenharmony_ci To compile this driver as a module, choose M here: the 228c2ecf20Sopenharmony_ci module will be called lapb. If unsure, say N. 23