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NAME    [Toc]    [Back]

     lmccontrol - configure Lan Media Corporation  SSI/HSSI/T1/T3

SYNOPSIS    [Toc]    [Back]

     lmccontrol [interface] [-l speed] [-cCeEsSkKoO]

DESCRIPTION    [Toc]    [Back]

     The lmccontrol command controls the operation of the Lan Media devices
     via the lmc(4) driver.  Most of the parameters that  can  be
changed relate
     to  the  line  characteristics  or layer 2 protocol options.
You can adjust
     layer 2 protocol keepalives, and line speed.   Line  characteristics which
     can  be  adjusted  include  CRC length, internal or external
clock source,
     DS3 scrambler, and DS3 cable length.

     This program controls the Lan Media SSI, HSSI, T1,  and  DS3
network interfaces.
   The  SSI is the LMC1000, and runs at various speeds
up to 10Mbps.
     It requires an  external  CSU/DSU  for  operation  on  T1/E1
lines.  The HSSI
     card  is  the  LMC5000,  and  runs  at  various speeds up to
52Mbps.  It requires
 an external DSU for operation on DS3 lines.  The  DS3
is the
     LMC5245  and  runs at a speed of 45Mbps.  It has no internal
clock generator,
 and does not require external DSU  for  DS3  operation.
The T1 card is
     the LMC1200 and runs at a speed of 1.544Mbps or 2Mbps for E1
     without CSU/DSU.

     The [interface] argument given to lmccontrol should  be  the
logical interface
  name associated with the Lan Media device (lmc0, lmc1,

     The lmccontrol command given without  any  additional  flags
retrieves the
     current card settings from the driver and prints them out.

     The options are as follows:

             The interface name of the Lan Media card (default is

     -l speed
             To manually specify line speed, in bits  per  second
(for devices
             without built-in CSU/DSU).

     -c       Sets the interface to use an external clock source.
This is only
             valid for SSI/HSSI cards.

     -C      Set the interface to use internal clocking.  On  the
SSI card this
             uses  the internal baud rate generator.  On the HSSI
card it uses
             the PCI bus clock.  This is only valid for  SSI/HSSI

     -e      Sets 16-bit CRC.

     -E      Sets 32-bit CRC.

     -k      Enables layer 2 keepalive.

     -K      Disables layer 2 keepalive.

     -s      Turn DS3 scrambler off.

     -S      Turn DS3 scrambler on.

     -o       Program the DS3 card for cable lengths of less than
100 feet.  In
             this mode, the card uses lower power to transmit data for short
             cable  runs,  which  might otherwise overdrive a receiver.  This is
             the default, and will work in most  situations  even
with runs more
             than 100 feet.

     -O       Program  the DS3 card for cable length for over 100
feet in length
             (higher power).

EXAMPLES    [Toc]    [Back]

     To set a SSI card for a speed of 2048000 bits/sec with  HDLC
     off, one could use:

     # lmccontrol lmc0 -l 2048000 -K

SEE ALSO    [Toc]    [Back]

     lmc(4), sppp(4), hostname.if(5), ifconfig(8), spppcontrol(8)

HISTORY    [Toc]    [Back]

     The lmccontrol utility first appeared in OpenBSD 2.8.

AUTHORS    [Toc]    [Back]

     The lmccontrol utility was written by Michael Graff <explorer@vix.com>.

OpenBSD      3.6                         October     11,     2000
[ Back ]
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