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LMC(4)                   BSD Kernel Interfaces Manual                   LMC(4)

NAME
     lmc -- Lan Media Corporation SSI/T1/DS1/HSSI/DS3 card device

SYNOPSIS
     lmc* at pci?

DESCRIPTION
     The lmc 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 inter-
     face.  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 cir-
     cuitry.

     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).

     The card will automatically use HDLC framing and defaults to external
     clock source.  For the DS1 and DS3 cards with built-in CSU/DSU function-
     ality, the clock source is always external (from CSU/DSU).  The ability
     to set cable length is not currently implemented.

     Using the sppp(4) driver, you can also use the ppp protocol.  In either
     case, the lmc interface should be configured as a point-to-point link.

DIAGNOSTICS
     lmc0: couldn't map interrupt  A fatal initialization error has occurred.

     lmc0: couldn't establish interrupt  A fatal initialization error has
     occurred.

     lmc0: enabling keepalive  Cisco HDLC keepalive packets will be transmit-
     ted.

     lmc0: disabling keepalive  Cisco HDLC keepalive packets will not be
     transmitted.

     lmc0: clock internal  The card is using internal clocking for the line.

     lmc0: clock external  The card is using external clocking for the line.

     lmc0: asserting DTR and RTS  The card is sending DTR and RTS signals on
     the line.

     lmc0: deasserting DTR and RTS  The card is not sending DTR and RTS sig-
     nals on the line.

     lmc0: Abnormal interrupt  The card received an incomplete request.  This
     may be a sign of a hardware fault.

     lmc0: tx_intr: failed to dequeue mbuf?!?  Only available if compiled with
     LMC_DEBUG.

     lmc0: txput: tx not running  Problem from tulip.  Only available if com-
     piled with LMC_DEBUG.

SEE ALSO
     netintro(4), sppp(4), ifconfig(8), lmccontrol(8)

AUTHORS
     The lmc device driver was written by Michael Graff, and was derived in
     part from Matt Thomas' de(4) driver.  The OpenBSD port and manual page
     are from Chris Cappuccio.  Later enhancements to support the LMC1200 card
     are based on LMC's Linux driver.

BSD                             April 29, 2017                             BSD