NetBSD/share/man/man4/man4.pmax/le.4

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.\" Copyright (c) 1996 Jonathan Stone.
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.\" $NetBSD: le.4,v 1.1 1996/08/11 02:29:11 jonathan Exp $
.\"
.Dd August 6, 1996
.Dt LE 4 pmax
.Os NetBSD 1.2
.Sh NAME
.Nm le
.Nd
DECstation AMD 7990 LANCE ethernet interface
.Sh SYNOPSIS
.Cd "le? at mainbus with le_pmax" (3100 baseboard)
.Cd "le*? at tc with le_tc" (5000/200 baseboard)
.Cd "le? at ioasic with le_ioasic" (ioasic baseboard)
.Cd "le* at tc? with le_tc" (TC option cards)
.Sh DESCRIPTION
The
.Nm
driver provies access to a 10Mb/s Ethernet via the
.Tn AMD
7990
.Tn LANCE
Ethernet chip. All
.Tn LANCE
interfaces on
.Tn DECstations ,
are supported. as are interfaces on
.Tn "Alpha AXP"
machines with a
.Tn TurboChannel
bus.
.Pp
The
.Nm driver employs the Address Resolution Prootocol described
in
.Xr arp 4
to map between Internet and Ethernet addresses on the local
network. Selective recption of multicast Ethernet frames is provided
by a 64-bit mask; multicast destination addresses are hashed to a
bit entry using the Ethernet CRC function.
.Pp
No support is provided for switching between media ports. The
DECstation 3100 provides both AUI and BNC (thinwire or 10base2) connectors.
Port selection is via a manual switch and is not software configurable.
The
.Tn DECstation
model 5000/200
.Tn PMAD-AA
baseboard device provides only a BNC connector, and the
.Tn PMAD-AA
.Tn TurboChannel
option card provides only an AUI port.
.Pp
.Sh SEE ALSO
.Xr intro 4 ,
.Xr inet 4 ,
.Xr arp 4
.Sh HISTORY
This
.Nm
driver is derived from a
.NM
driver that first appeared in
.Bx 4.4 .
The multiple bus attachment support first appeared in
.Nx 1.2 .