LMCCONTROL(8) OpenBSD System Manager's Manual LMCCONTROL(8)NAMElmccontrol - configure Lan Media Corporation SSI/HSSI/T1/T3 devices
SYNOPSISlmccontrol [-CcEeKkOoSs] [-l speed] [interface]
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 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
operation, without CSU/DSU.
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:
-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.
-c Sets the interface to use an external clock source. This is only
valid for SSI/HSSI cards.
-E Sets 32-bit CRC.
-e Sets 16-bit CRC.
-K Disables layer 2 keepalive.
-k Enables layer 2 keepalive.
-l speed
To manually specify line speed, in bits per second (for devices
without built-in CSU/DSU).
-O Program the DS3 card for cable length for over 100 feet in length
(higher power).
-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.
-S Turn DS3 scrambler on.
-s Turn DS3 scrambler off.
interface
The interface name of the Lan Media card (default is lmc0).
EXAMPLES
Set an SSI card for a speed of 2048000 bits/sec with HDLC keepalive off:
# lmccontrol lmc0 -l 2048000 -K
SEE ALSOlmc(4), sppp(4), hostname.if(5), ifconfig(8)HISTORY
The lmccontrol utility first appeared in OpenBSD 2.8.
AUTHORS
The lmccontrol utility was written by Michael Graff <explorer@vix.com>.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9
