LMCCTL(8)               OpenBSD System Manager's Manual              LMCCTL(8)

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

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

DESCRIPTION
     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 controlls the Lan Media SSI, HSSI, T1, and DS3 network in-
     terfaces.  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 genera-
     tor, 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 operation,
     without CSU/DSU.

     The [interface] argument given to lmccontrol should be the logical inter-
     face name associated with the Lan Media device (lmc0, lmc1, etc...).

     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:

     interface
             The interface name of the Lan Media card (default is lmc0)

     -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 cards.

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

           lmccontrol lmc0 -l 2048000 -K

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

HISTORY
     The lmccontrol utility first appeared in OpenBSD 2.8.

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

OpenBSD 2.9                    October 11, 2000                              2
