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Annotation of 43BSDTahoe/man/man4/vax/dmc.4, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1983 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)dmc.4       6.4 (Berkeley) 1/30/87
                      6: .\"
                      7: .TH DMC 4 "January 30, 1987"
                      8: .UC 5
                      9: .SH NAME
                     10: dmc \- DEC DMC-11/DMR-11 point-to-point communications device
                     11: .SH SYNOPSIS
                     12: .B "device dmc0 at uba0 csr 167600 vector dmcrint dmcxint"
                     13: .SH DESCRIPTION
                     14: The
                     15: .I dmc
                     16: interface provides access to a point-to-point communications
                     17: device which runs at either 1 Mb/s or 56 Kb/s.  DMC-11's communicate
                     18: using the DEC DDCMP link layer protocol.
                     19: .PP
                     20: The
                     21: .I dmc
                     22: interface driver also supports a DEC DMR-11 providing point-to-point
                     23: communication running at data rates from 2.4 Kb/s to 1 Mb/s.
                     24: DMR-11's are a more recent design and thus are preferred over DMC-11's.
                     25: The NXMT and NRCV constants in the driver may be increased in this case,
                     26: as the DMR can accept up to 64 transmit and receive buffers, as opposed
                     27: to 7 for the DMC.
                     28: .PP
                     29: The configuration flags specify how to set up the device, 
                     30: .br
                     31: 0 -- full duplex DDCMP (normal mode)
                     32: .br
                     33: 1 -- DDCMP Maintence mode (generally useless)
                     34: .br
                     35: 2 -- DDCMP Half Duplex, primary station
                     36: .br
                     37: 3 -- DDCMP Half Duplex, secondary station
                     38: .ti
                     39: .PP
                     40: Several device error counters are available via "adb", for
                     41: more information see the adb script /usr/lib/adb/dmcstats, or the
                     42: DMC11 technical manual.
                     43: .PP
                     44: The host's address must be specified with an SIOCSIFADDR ioctl,
                     45: and the destination address specified with a SIOCSIFDSTADDR ioctl,
                     46: before the interface will transmit or receive any packets.
                     47: .SH ROUTING
                     48: The driver places a HOST entry in the kernel routing tables for the
                     49: address given in the SIOCSIFDSTADDR ioctl.  To use the DMC as a
                     50: link between local nets, the route to the remote net must be added manually
                     51: with the
                     52: .IR route (8)
                     53: command, or by the use of the routing process
                     54: .IR routed (8)
                     55: on each end of the link.
                     56: .SH DIAGNOSTICS
                     57: .BR "dmc%d: bad control %o" .
                     58: A bad parameter was passed to the
                     59: .I dmcload
                     60: routine.
                     61: .PP
                     62: .BR "dmc%d: unknown address type %d" .
                     63: An input packet was received which contained a type of
                     64: address unknown to the driver.
                     65: .PP
                     66: .BR "DMC fatal error 0%o" .
                     67: A fatal error in DDMCP occurred, causing the device to be restarted.
                     68: .PP
                     69: .BR "DMC soft error 0%o" .
                     70: A non-fatal error in DDMCP has occurred. 
                     71: .PP
                     72: .BR "dmc%d: af%d not supported" . 
                     73: The interface was handed a message which has
                     74: addresses formatted in an unsuitable address family.
                     75: .SH SEE ALSO
                     76: intro(4N), inet(4F)
                     77: .SH BUGS
                     78: The current version of the driver uses a link-level encapsulation
                     79: so that multiple protocol types may be used.
                     80: It is thus incompatible with earlier drivers,
                     81: including the 4.2BSD version.

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