| # SPDX-License-Identifier: GPL-2.0-only | 
 | # | 
 | # CCITT X.25 Packet Layer | 
 | # | 
 |  | 
 | config X25 | 
 | 	tristate "CCITT X.25 Packet Layer" | 
 | 	---help--- | 
 | 	  X.25 is a set of standardized network protocols, similar in scope to | 
 | 	  frame relay; the one physical line from your box to the X.25 network | 
 | 	  entry point can carry several logical point-to-point connections | 
 | 	  (called "virtual circuits") to other computers connected to the X.25 | 
 | 	  network. Governments, banks, and other organizations tend to use it | 
 | 	  to connect to each other or to form Wide Area Networks (WANs). Many | 
 | 	  countries have public X.25 networks. X.25 consists of two | 
 | 	  protocols: the higher level Packet Layer Protocol (PLP) (say Y here | 
 | 	  if you want that) and the lower level data link layer protocol LAPB | 
 | 	  (say Y to "LAPB Data Link Driver" below if you want that). | 
 |  | 
 | 	  You can read more about X.25 at <http://www.sangoma.com/tutorials/x25/> and | 
 | 	  <http://docwiki.cisco.com/wiki/X.25>. | 
 | 	  Information about X.25 for Linux is contained in the files | 
 | 	  <file:Documentation/networking/x25.txt> and | 
 | 	  <file:Documentation/networking/x25-iface.txt>. | 
 |  | 
 | 	  One connects to an X.25 network either with a dedicated network card | 
 | 	  using the X.21 protocol (not yet supported by Linux) or one can do | 
 | 	  X.25 over a standard telephone line using an ordinary modem (say Y | 
 | 	  to "X.25 async driver" below) or over Ethernet using an ordinary | 
 | 	  Ethernet card and the LAPB over Ethernet (say Y to "LAPB Data Link | 
 | 	  Driver" and "LAPB over Ethernet driver" below). | 
 |  | 
 | 	  To compile this driver as a module, choose M here: the module | 
 | 	  will be called x25. If unsure, say N. |