160 lines
4.5 KiB
Groff
160 lines
4.5 KiB
Groff
.\" Copyright (c) 1983, 1991 Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)dmc.4 6.5 (Berkeley) 3/27/91
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.\" $Id: dmc.4,v 1.2 1993/08/01 07:36:29 mycroft Exp $
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.\"
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.Dd March 27, 1991
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.Dt DMC 4 vax
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.Os BSD 4.2
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.Sh NAME
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.Nm dmc
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.Nd
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.Tn DEC
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.Tn DMC-11 Ns / Tn DMR-11
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point-to-point communications device
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.Sh SYNOPSIS
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.Cd "device dmc0 at uba0 csr 167600 vector dmcrint dmcxint"
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.Sh DESCRIPTION
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The
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.Nm dmc
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interface provides access to a point-to-point communications
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device which runs at either 1 Mb/s or 56 Kb/s.
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.Tn DMC-11 Ns s
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communicate
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using the
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.Tn DEC DDCMP
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link layer protocol.
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.Pp
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The
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.Nm dmc
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interface driver also supports a
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.Tn DEC
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.Tn DMR-11
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providing point-to-point
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communication running at data rates from 2.4 Kb/s to 1 Mb/s.
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.Tn DMR-11 Ns s
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are a more recent design and thus are preferred over
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.Tn DMC-11 Ns s .
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The
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.Dv NXMT
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and
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.Dv NRCV
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constants in the driver may be increased in this case,
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as the
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.Tn DMR
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can accept up to 64 transmit and receive buffers, as opposed
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to 7 for the
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.Tn DMC .
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.Pp
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The configuration flags specify how to set up the device,
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.Bl -column xxx -offset indent
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0 full duplex DDCMP (normal mode)
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1 DDCMP Maintence mode (generally useless)
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2 DDCMP Half Duplex, primary station
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3 DDCMP Half Duplex, secondary station
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.El
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.Pp
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Several device error counters are available via
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.Xr adb 1 ,
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for
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more information see the
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.Xr adb
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script
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.Pa /usr/lib/adb/dmcstats ,
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or the
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.Tn DMC-11
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technical manual.
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.Pp
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The host's address must be specified with an
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.Dv SIOCSIFADDR
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.Xr ioctl 2 ,
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and the destination address specified with a
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.Dv SIOCSIFDSTADDR
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.Xr ioctl ,
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before the interface will transmit or receive any packets.
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.Sh ROUTING
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The driver places a
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.Tn HOST
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entry in the kernel routing tables for the
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address given in the
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.Dv SIOCSIFDSTADDR
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.Xr ioctl.
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To use the
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.Tn DMC
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as a
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link between local nets, the route to the remote net must be added manually
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with the
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.Xr route 8
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command, or by the use of the routing process
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.Xr routed 8
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on each end of the link.
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.Sh DIAGNOSTICS
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.Bl -diag
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.It dmc%d: bad control %o.
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A bad parameter was passed to the
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.Em dmcload
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routine.
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.Pp
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.It dmc%d: unknown address type %d.
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An input packet was received which contained a type of
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address unknown to the driver.
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.Pp
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.It DMC fatal error 0%o.
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A fatal error in
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.Tn DDMCP
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occurred, causing the device to be restarted.
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.Pp
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.It DMC soft error 0%o.
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A non-fatal error in
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.Tn DDMCP
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has occurred.
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.Pp
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.It dmc%d: af%d not supported.
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The interface was handed a message which has
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addresses formatted in an unsuitable address family.
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.El
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.Sh SEE ALSO
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.Xr intro 4 ,
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.Xr inet 4
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.Sh HISTORY
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The
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.Nm
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driver appeared in
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.Bx 4.2 .
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.Sh BUGS
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The current version of the driver uses a link-level encapsulation
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so that multiple protocol types may be used.
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It is thus incompatible with earlier drivers,
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including the
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.Bx 4.2
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version.
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