.\" $OpenBSD: lmc.4,v 1.26 2013/06/02 20:23:33 tedu Exp $
.\"
.\" Copyright (c) 1999 Chris Cappuccio
.\"
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.Dd $Mdocdate: June 2 2013 $
.Dt LMC 4
.Os
.Sh NAME
.Nm lmc
.Nd Lan Media Corporation SSI/T1/DS1/HSSI/DS3 card device
.Sh SYNOPSIS
.Cd "lmc* at pci?"
.Sh DESCRIPTION
The
.Nm
driver provides support for the Lan Media Corporation SSI, T1/DS1, HSSI, and DS3
PCI WAN adapters based on the DEC 21140 Ethernet chip.
The adapters use a DEC 21140 Ethernet chip for the PCI bus interface.
Leaving the bus interface chip, the data path goes through a field programmable
gate array, where HDLC processing is accomplished.
Leaving the FPGA, there are FIFO buffers and the DS1, DS3, and V.35 drive
circuitry.
.Pp
The intent is to provide a synchronous serial link with HDLC framing at speeds
of up to 10Mbps (for the SSI card), 52Mbps (for the HSSI card), BNC connectors
for 45Mbps operation without a CSU/DSU (DS3 card), and an RJ45 jack for
T1/E1 operation without a CSU/DSU (T1/DS1 card).
.Pp
The card will automatically use HDLC framing and defaults to external clock
source.
For the DS1 and DS3 cards with built-in CSU/DSU functionality,
the clock source is always external (from CSU/DSU).
The ability to set cable length is not currently implemented.
.Pp
Using the
.Xr sppp 4
driver, you can also use the ppp protocol.
In either case, the
.Nm
interface should be configured as a point-to-point
link.
.Sh DIAGNOSTICS
.Bl -diag
.It "lmc0: couldn't map interrupt"
A fatal initialization error has occurred.
.It "lmc0: couldn't establish interrupt"
A fatal initialization error has occurred.
.It "lmc0: enabling keepalive"
Cisco HDLC keepalive packets will be transmitted.
.It "lmc0: disabling keepalive"
Cisco HDLC keepalive packets will not be transmitted.
.It "lmc0: clock internal"
The card is using internal clocking for the line.
.It "lmc0: clock external"
The card is using external clocking for the line.
.It "lmc0: asserting DTR and RTS"
The card is sending DTR and RTS signals on the line.
.It "lmc0: deasserting DTR and RTS"
The card is not sending DTR and RTS signals on the line.
.It "lmc0: Abnormal interrupt"
The card received an incomplete request.
This may be a sign of a hardware fault.
.It "lmc0: tx_intr: failed to dequeue mbuf?!?"
Only available if compiled with LMC_DEBUG.
.It "lmc0: txput: tx not running"
Problem from tulip.
Only available if compiled with LMC_DEBUG.
.El
.Sh SEE ALSO
.Xr netintro 4 ,
.Xr sppp 4 ,
.Xr ifconfig 8 ,
.Xr lmccontrol 8
.Sh AUTHORS
The
.Nm
device driver was written by Michael Graff, and was derived in part from
Matt Thomas'
.Xr de 4
driver.
The
.Ox
port and manual page are from Chris Cappuccio.
Later enhancements to support the LMC1200 card are based on LMC's
Linux driver.