BSD 2.11 - man page for dmc (bsd section 4)
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dmc - DEC DMC-11/DMR-11 point-to-point communications device
NDMC dmc_controllers # DMC11
The dmc interface provides access to a point-to-point communications device which runs at
either 1 Mb/s or 56 Kb/s. DMC-11's communicate using the DEC DDCMP link layer protocol.
The dmc interface driver also supports a DEC DMR-11 providing point-to-point communication
running at data rates from 2.4 Kb/s to 1 Mb/s. DMR-11's are a more recent design and thus
are preferred over DMC-11's. The NXMT and NRCV constants in the driver should be
increased in this case, as the DMR can accept up to 64 transmit and receive buffers, as
opposed to 7 for the DMC.
The configuration flags specify how to set up the device,
0 -- full duplex DDCMP (normal mode)
1 -- DDCMP Maintence mode (generally useless)
2 -- DDCMP Half Duplex, primary station
3 -- DDCMP Half Duplex, secondary station
Several device error counters are available via "adb", for more information see the adb
script /usr/share/adb/dmcstats, or the DMC11 technical manual.
The host's address must be specified with an SIOCSIFADDR ioctl, and the destination
address specified with a SIOCSIFDSTADDR ioctl, before the interface will transmit or
receive any packets.
The driver places a HOST entry in the kernel routing tables for the address given in the
SIOCSIFDSTADDR ioctl. To use the DMC as a link between local nets, the route to the
remote net must be added manually with the route(8) command, or by the use of the routing
process routed(8) on each end of the link.
dmc%d: bad control %o. A bad parameter was passed to the dmcload routine.
dmc%d: unknown address type %d. An input packet was received which contained a type of
address unknown to the driver.
DMC fatal error 0%o. A fatal error in DDMCP occurred, causing the device to be restarted.
DMC soft error 0%o. A non-fatal error in DDMCP has occurred.
dmc%d: af%d not supported. The interface was handed a message which has addresses format-
ted in an unsuitable address family.
The current version of the driver uses a link-level encapsulation so that multiple proto-
col types may be used. It is thus incompatible with earlier drivers, including the 4.2BSD
3rd Berkeley Distribution October 22, 1996 DMC(4)
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