NAME    [Toc]    [Back]

       lfa - DAPCA/DAPBA Asynchronous Transfer Mode (ATM) Network
       Interface

SYNOPSIS    [Toc]    [Back]

       config-driver        lfa

DESCRIPTION    [Toc]    [Back]

       The lfa interface can be either the ATM HE622 ATM  adapter
       (DAPCA)  or  the  ATM HE155 ATM adapter (DAPBA), providing
       transmission rates of 622  megabits  per  second  and  155
       megabits  per second, respectively.  Both adapters use the
       same driver.

       The lfa driver controls the transmission and reception  of
       data  across  the  ATM network over specified Virtual Circuits
 (VCs).  The creation and management of  the  VCs  is
       controlled  by  the ATM subsystem software that sits above
       the driver.  When the driver is started, it registers with
       the ATM subsystem and then performs any task that the subsystem
 requests.

       Note that the transmission rate of the  link  is  not  the
       same  as  the transmission rate as seen by a user application.
  The following factors can contribute to  this:  the
       speed  of the Peripheral Component Interconnect (PCI) bus,
       the signaling overhead on  the  link  medium  itself,  the
       speed  of  the  host  processor, and other activity in the
       system (especially on the same PCI bus).

       See the sys_attrs_lfa(5) reference  page  for  a  list  of
       thelfa subsystem attributes.

ERRORS    [Toc]    [Back]

       The  following diagnostic and error messages contain relevant
 information provided by the lfa  interface,  and  are
       displayed  on  the  console.  Each message begins with the
       adapter identification, including the adapter number  (for
       example,  lfa0).   Ensure that either a HE622 or HE155 ATM
       adapter is installed in the system and that it is a DAPBAFA,
  DAPBA-UA,  or DAPCA-FA.  The specified adapter failed
       its initialization due to insufficient  memory  resources.
       This  could possibly happen if kernel memory debugging was
       enabled in the /etc/sysconfigtab file.  If this message is
       displayed,  the  adapter  will  not  operate.   The driver
       failed when it tried to register itself with the ATM  subsystem
 because the optional ATM components are not configured
 in the kernel.  Reconfigure your kernel with the  the
       ATM,  UNI3X,  ATMIP,  and  LANE options.  See Asynchronous
       Transfer Mode for more  information.   An  error  occurred
       when  trying  to gather the resources necessary (for example,
 memory for data structures and specified bit rate for
       transmission)  to  set  up  a  Virtual  Circuit  (VC).  An
       invalid VPI or VCI value was passed to the  VC  activation
       routine.   Ensure  that  the values specified fit into the
       range given for the num_vpi_bits  attribute  described  in
       the "Subsystem Attributes" section.  A request to delete a
       VC was made and the VC was transmitting.   This  condition
       did  not  go away after 1 second so the VC will be deleted
       anyway.  It is possible that the VC's state  is  inconsistent,
  and  that  this  may  indicate  a  problem with the
       driver.

       Informational messages contain information provided by the
       lfa  driver. These messages are printed on the console and
       begin  with  the  adapter  identification,  including  the
       adapter  number.   The  driver successfully configured and
       registered itself with the ATM  subsystem  software.   The
       connection  either  to a switch or to another system (in a
       point-to-point configuration)  exists.   This  message  is
       displayed after the driver is initially brought up.  If it
       is not displayed, it is likely there is a problem with the
       cables.   The  connection either to a switch or to another
       system existed, but no longer  exists.   An  administrator
       issued  a command to shut down the adapter.  If you do not
       see this message, the adapter is  still  operational.   To
       shut down the adapter, use the atmconfig down command.

SEE ALSO    [Toc]    [Back]

       Commands: netstat(1), atmarp(8), atmconfig(8), atmelan(8),
       atmsig(8), sysconfig(8)

       Attributes: sys_attrs_lfa(5)

       NetworkInformation: arp(7), inet(7), intro(7)

       Asynchronous Transfer Mode

       Network Administration: Connections



                                                           lfa(7)