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 lan(7)								      lan(7)




 NAME
      lan - network I/O card access information

 DESCRIPTION
      This manual entry gives a brief description on how to access the LAN
      device driver at Layer 2 (Data Link Layer) of the OSI architecture.
      The LAN device driver controls the various LAN interface cards (e.g,
      Ethernet/IEEE 802.3, FDDI, Token Ring) at Layer 1 (Physical Layer).

      The Data Link Provider Interface (DLPI) is the supported method for
      accessing the LAN device driver at Layer 2.  DLPI is intended for use
      by knowledgeable network users only.  Refer to the DLPI Programmer's
      Guide for complete programming details.

      There are HP and non-HP drivers and interface cards which will provide
      their own DLPI module.   These types of DLPI are referred to as
      ``native'' DLPI.

    Overview
      The Physical Point of Attachment (PPA) is a numerical value that
      uniquely identifies a particular device.	 The PPA value can be
      obtained from the lanscan command.   The ``NamePPA'' identifier in the
      lanscan output is a concatenation of the interface name and the PPA
      number.  The card instance value for a lan device is equivalent to the
      PPA number for that device.

      A single hardware device may have multiple ``NamePPA'' identifiers,
      which indicates multiple encapsulation methods supported for to the
      device.  For Ethernet/IEEE 802.3 links, the ``Name'' lan is used to
      designate Ethernet encapsulation, and snap for IEEE 802.3
      encapsulation.  For other links (FDDI, Token Ring), only the lan
      encapsulation designation is used.

      Methods of transfer over the DLPI interface through the lan devices
      include ``raw'', ``connectionless'', and ``connection-oriented'' data
      transfers.

 WARNING
      The Link Level Access (LLA) interface is obsolete.

 AUTHOR
      lan was developed by HP.

 SEE ALSO
      lanscan(1M), lanadmin(1M), linkloop(1M).

      DLPI Programmer's Guide, 1995, Hewlett-Packard

      The Ethernet, A LAN: Data Link Layer and Physical Specification,
      Version 2.0, November 1982, Digital Equipment Corporation, Intel
      Corporation, Xerox Corporation



 Hewlett-Packard Company	    - 1 -   HP-UX Release 11i: November 2000






 lan(7)								      lan(7)




      CSMA/CD Access Method and Physical Layer Specification, 1996,
      Institute of Electrical and Electronic Engineers

      Demand-Priority Access Method, Physical Layer & Repeater
      Specifications, 1996, Institute of Electrical and Electronic Engineers

      Fiber Distributed Data Interface (FDDI) Physical Layer Medium
      Dependent (PMD), 1995, ANSI

      Token Ring Access Method and Physical Layer Specification, 1995,
      Institute of Electrical and Electronic Engineers

      802.3u Media Access Control Parameters, Physical Layer, Medium
      Attachment Units, and Repeater for 100 Mb/s Operation, Type 100BASE-T,
      1995, Institute of Electrical and Electronic Engineers







































 Hewlett-Packard Company	    - 2 -   HP-UX Release 11i: November 2000