BSD 4_3 release

[unix-history] / usr / man / man4 / en.4

diff --git a/usr/man/man4/en.4 b/usr/man/man4/en.4
index 70f475e..8e1d28c 100644 (file)
--- a/usr/man/man4/en.4
+++ b/usr/man/man4/en.4
@@ -1,5 +1,11 @@
-.TH EN 4 "27 July 1983"
-.UC 4
+.\" Copyright (c) 1983 Regents of the University of California.
+.\" All rights reserved.  The Berkeley software License Agreement
+.\" specifies the terms and conditions for redistribution.
+.\"
+.\"    @(#)en.4        6.2 (Berkeley) 5/16/86
+.\"
+.TH EN 4 "May 16, 1986"
+.UC 5

 .SH NAME
 en \- Xerox 3 Mb/s Ethernet interface
 .SH SYNOPSIS
 .SH NAME
 en \- Xerox 3 Mb/s Ethernet interface
 .SH SYNOPSIS


@@ -10,12 +16,15 @@ The
 interface provides access to a 3 Mb/s Ethernet network.
 Due to limitations in the hardware, DMA transfers
 to and from the network must take place in the lower 64K bytes
 interface provides access to a 3 Mb/s Ethernet network.
 Due to limitations in the hardware, DMA transfers
 to and from the network must take place in the lower 64K bytes

-of the UNIBUS address space.
+of the UNIBUS address space, and thus this must be among the first
+UNIBUS devices enabled after boot.

 .PP
 .PP

-The network number is specified with a SIOCSIFADDR ioctl; the
-host's address is discovered by probing the on-board Ethernet
-address register.  No packets will be sent or accepted until 
-a network number is supplied.
+Each of the host's network addresses
+is specified at boot time with an SIOCSIFADDR
+ioctl.  The station address is discovered by probing the on-board Ethernet
+address register, and is used to verify the protocol addresses.
+No packets will be sent or accepted until 
+a network address is supplied.

 .PP
 The interface software implements an exponential backoff algorithm
 when notified of a collision on the cable.  This algorithm utilizes
 .PP
 The interface software implements an exponential backoff algorithm
 when notified of a collision on the cable.  This algorithm utilizes


@@ -38,15 +47,12 @@ the two's complement of the value).
 Use the value calculated in step 3 to delay before retransmitting
 the packet.
 .PP
 Use the value calculated in step 3 to delay before retransmitting
 the packet.
 .PP

-The interface handles both Internet and PUP protocol families,
-with the interface address maintained in Internet format.
-PUP addresses are converted to Internet addresses by subsituting
-PUP network and host values for Internet network and local part
-values.
-.PP
-The interface normally tries to use a ``trailer'' encapsulation
-to minimize copying data on input and output.  This may be
-disabled, on a per-interface basis, by setting the IFF_NOTRAILERS
+The interface handles both Internet and NS protocol families.
+It normally tries to use a ``trailer'' encapsulation
+to minimize copying data on input and output.
+The use of trailers is negotiated with ARP.
+This negotiation may be disabled, on a per-interface basis,
+by setting the IFF_NOTRAILERS

 flag with an SIOCSIFFLAGS ioctl.
 .SH DIAGNOSTICS
 .BR "en%d: output error" .
 flag with an SIOCSIFFLAGS ioctl.
 .SH DIAGNOSTICS
 .BR "en%d: output error" .