From owner-FreeBSD-net-jp@jp.freebsd.org  Tue Aug 25 09:49:33 1998
Received: (from daemon@localhost)
	by jaz.jp.freebsd.org (8.9.1+3.0W/8.7.3) id JAA21271;
	Tue, 25 Aug 1998 09:49:33 +0900 (JST)
	(envelope-from owner-FreeBSD-net-jp@jp.FreeBSD.org)
Received: from fgwmail.fujitsu.co.jp (fgwmail.fujitsu.co.jp [164.71.1.133])
	by jaz.jp.freebsd.org (8.9.1+3.0W/8.7.3) with ESMTP id JAA21265
	for <FreeBSD-net-jp@jp.freebsd.org>; Tue, 25 Aug 1998 09:49:30 +0900 (JST)
	(envelope-from seki@sysrap.cs.fujitsu.co.jp)
Received: from fdmmail.fujitsu.co.jp by fgwmail.fujitsu.co.jp (8.9.1a/3.7W-MX980821-Fujitsu Gateway)
	id JAA21851; Tue, 25 Aug 1998 09:49:25 +0900 (JST)
Received: from nile.sysrap.cs.fujitsu.co.jp by fdmmail.fujitsu.co.jp (8.8.8+2.7Wbeta7/3.6W-980716-Fujitsu Domain Master)
	id JAA19722; Tue, 25 Aug 1998 09:49:18 +0900 (JST)
Received: from localhost (localhost [127.0.0.1]) by nile.sysrap.cs.fujitsu.co.jp (8.8.8/8.7.3) with ESMTP id JAA06131 for <FreeBSD-net-jp@jp.freebsd.org>; Tue, 25 Aug 1998 09:49:17 +0900 (JST)
To: FreeBSD-net-jp@jp.freebsd.org
In-Reply-To: Your message of "Mon, 24 Aug 1998 19:04:38 +0900"
	<19980824190438P.ryuichi@falcon.cs.ritsumei.ac.jp>
References: <19980824190438P.ryuichi@falcon.cs.ritsumei.ac.jp>
X-Mailer: Mew version 1.91 on Emacs 20.2 / Mule 3.0 (MOMIJINOGA)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=iso-2022-jp
Content-Transfer-Encoding: 7bit
Message-Id: <19980825094917G.seki@sysrap.cs.fujitsu.co.jp>
Date: Tue, 25 Aug 1998 09:49:17 +0900
From: Masahiro Sekiguchi <seki@sysrap.cs.fujitsu.co.jp>
X-Dispatcher: imput version 971024
Lines: 77
Reply-To: FreeBSD-net-jp@jp.freebsd.org
Precedence: list
X-Distribute: distribute version 2.1 (Alpha) patchlevel 24e+980820
X-Sequence: FreeBSD-net-jp 978
Subject: [FreeBSD-net-jp 978] Re: Full-Duplex or Half-Duplex
Errors-To: owner-FreeBSD-net-jp@jp.freebsd.org
Sender: owner-FreeBSD-net-jp@jp.freebsd.org

> Ethernet $B$N(B LAN $B$G!"(BFull-Duplex $B$H!"(BHalf-Duplex $B$I$A$i$r;H$o$l$F$$$^$9$+(B?

$B;d$N$H$3$m$G$O!"N><T:.:_$G$9$M!#(B(10M $B$H(B 100M $B$b:.:_!#(B)

> LAN $BA4$F$r(B Full-Duplex $B$GE}0l(B

$B;d$N46$8$G$O!":#F|$N>u67$G!"A4Fs=E$GE}0l$9$k$?$a$K$O!"Cm0U$7$F5!4o$rA*(B
$BBr$9$kI,MW$,$"$k$H;W$$$^$9!#$^$@$^$@!"A4Fs=E$KBP1~$G$-$J$$%M%C%H%o!<%/(B
$B5!4o$H$$$&$b$N$O!"B??t=P2s$C$F$$$k$H;W$$$^$9!#(B($BCMCJ$b9b$$!#(B)

> $B%M%C%H%o!<%/$K>\$7$$!"$"$k@hGZ[)$/!VIaDL!"(BFull-Duplex $B$@$h!W$H8@$o$l$^$7$?!#(B

$B$=$&$+$J$!!#>/$J$/$H$b8D?ME*$K$O!"!VIaDL(B Full-Duplex$B!W$H$$$&;~Be$O!"$^(B
$B$@!"$d$C$F$-$F$$$J$$$H;W$$$^$9!#(B($B2?$,IaDL$+!"$H$$$&$N$O!"4D6-$K$h$C$F(B
$B$:$$$V$s0c$$$^$9$+$i!"$=$N@hGZ$O!";d$KHf$Y$F!"A"$^$7$$4D6-$G@83h$7$F$$(B
$B$k$N$+$b$7$l$^$;$s!#(B:-)

> $B$*$=$i$/$=$l0JMh!"%3%M%/%7%g%s$,IT0BDj$J$h$&$K46$8$k$N$G$9!#(B
> 
> $B0lDjNLDL?.$,9T$J$o$l$F!"$7$P$i$/ES@d$($F!"$^$?$D$J$,$C$F(B...

$B8=>]E*$K$O!"$"$^$j?4Ev$?$j$,$"$j$^$;$s$,!"0J2<$O;29M$K$J$k$+$bCN$l$^$;(B
$B$s!#(B

$B$^$:!"86M}(B (?) $B$G$9$,!"(B

$B!&(B $B@$$NCf$N%$!<%5%M%C%H5!4o$K$O!VH>Fs=E@lMQ!W$N$b$N$H!VA4Fs=E!&H>Fs=E(B
   $B@Z$jBX$(!W$N$b$N$,$"$j$^$9$,!"!VA4Fs=E@lMQ!W$H$$$&$b$N$O$J$$$H;W$$(B
   $B$^$9!#(B

$B!&(B $B!VA4Fs=E!W$,MxMQ$G$-$k$N$O!"%D%$%9%H@~$r;H$&$b$N(B (10baseT $B$^$?$O(B
   100baseTX) $B$^$?$O8w%U%!%$%P$r;H$&$b$N(B (10baseFL $B$^$?$O(B 100baseFX) 
   $B$@$1$G$9!#F1<4%1!<%V%k$r;H$&>l9g(B (10base5 $B$d(B 10base2) $B$O!"Nc$(5!4o(B
   $B$,A4Fs=E$KBP1~$7$F$$$F$b!"I,$:H>Fs=E$K$J$j$^$9!#(B

$B!&(B PC $B$KA^$79~$`%$!<%5%\!<%I!"%k!<%?!"%9%$%C%A!"$H$$$&N`$N5!4o$O!"A4Fs(B
   $B=E$KBP1~$9$k$b$N$,A}$($F$$$k$H;W$$$^$9!#(B($B:G?75!<o$G!"%m!<%(%s%I$G$J(B
   $B$$$b$N$J$i$P!"BgDq$OBP1~$7$F$$$k$H;W$&!#(B) $B$7$+$7!"%l%T!<%?%O%V$H8F(B
   $B$P$l$kN`$N$b$N$O!"$^$:4V0c$$$J$/H>Fs=E@lMQ$@$H;W$$$^$9!#(B

$B!&(B $B!V@Z$jBX$(!W$N5!4o$K$O!"!V<jF0$G8GDjE*$K@_Dj!W$H$$$&%?%$%W$N$b$N$H!"(B
   $B!V<+F0A*Br!W$N$b$N$,$"$j$^$9!#(B($B!V<jF0$G8GDj!W$+!V<+F0!W$+$r!"<jF0$G(B
   $BA*Br$G$-$k!"$H$$$&$b$N$b$"$j$^$9!#(B:-)

$B!&(B $B:G6a$N5!4o$G$OLdBj$,5/$-$J$$$h$&$@$,!"=i4|$NA4Fs=EBP1~5!4o$G$O!"@\(B
   $BB3Aj<j$K$h$C$F!V<+F0A*Br!W$,$&$^$/5!G=$7$J$$$3$H$,$"$C$?!#Nc$($P!"(B
   $B<+F0A*Br$N5!4oF1;N$rBP93$5$;$F@\B3$9$k$H!"0lJ}$,A4Fs=E!"B>J}$,H>Fs(B
   $B=E$K$J$C$F$7$^$&$3$H$9$i!"$"$C$?!#(B($B<BOC!#(B:-( )

$B!&(B $BA4Fs=E$N%j%s%/$G5!G=$9$k%U%m!<@)8f$N%W%m%H%3%k$O!"$o$j$H:G6a$K$J$C(B
   $B$FI8=`2=$5$l$?$?$a!"$^$@%5%]!<%H$7$F$$$J$$5!4o$,B?$$!#%U%m!<@)8f$r(B
   $B%5%]!<%H$7$J$$A4Fs=E$N@\B3$r9T$&$H!"%H%i%R%C%/$,FCDj$N%^%7%s$K=8Cf(B
   $B$9$k>l9g$H$+!"(B10M/100M $B:.:_4D6-$G(B 100 $B"*(B 10 $B$X$NEO$j$,$"$k>l9g$H$+(B
   $B$K!"%Q%1%C%H%m%9$,B?H/$9$k>l9g$,$"$k!#(B

$B!&(B $B%1!<%V%k$GD>7k$5$l$?N>C<(B ($BNc$($P(B PC $B$N%$!<%5%+!<%I$H!"$=$l$r7R$.$3(B
   $B$s$G$$$k%O%V$N%]!<%H(B) $B$G!"0lJ}$,A4Fs=E!"B>J}$,H>Fs=E$K@_Dj$5$l$F$$(B
   $B$k$H!"%H%i%R%C%/$,>/$J$$$H$-$K$ODL?.$G$-$F$$$k$h$&$K8+$($^$9$,!"(B

	$B!&(B $BH>Fs=E$NB&$G$O!"7c$7$/(B collision $B$,H/@8$9$k!#$7$+$b!"(Blate
	   collision $B$bB?H/$9$k!#(B

	$B!&(B $BA4Fs=E$NB&$G$O!"(BFCS error $B$d(B Alignment error $B$,B?H/$9$k!#(B

   $B$H$$$&8=>]$,H/@8$7$^$9!#(B

> $B$=$3$G!"!X>e5-$N860x$,!"(BFull-Duplex $B%b!<%I$K$"$k$N$+!Y!"(B

$B:G8e$NJ}$K=q$$$?$3$H$O!"$h$&$9$k$K!"!VA4Fs=E$N9=@.$,$&$^$/$$$C$F$$$J$$(B
$B$H!"%Q%1%C%H$,$J$/$J$k$h!<$s!W$H$$$&$3$H$J$N$G!"Nc$($P(B NFS $B$,@Z$l$k$H(B
$B$+!"(BFTP $B$,CY$$!"$H$$$&8=>]$K$J$C$F8=$l$k2DG=@-$O$"$k$H;W$$$^$9!#(B

$B$H$j$"$($:!"2?$,5/$-$F$$$k$N$+D4$Y$k$N$,$$$$$H;W$$$^$9!#(B

$BB?J,!"A4Fs=E$KBP1~$7$?%9%$%C%A$J$i$P!"E}7W$r=8$a$kDxEY$N%$%s%F%j%8%'%s(B
$B%9$,$"$k$G$7$g$&$+$i!"(Bpacket loss$B!"(Bcollision$B!"(BFCS error $BEy$NIQEY(B ($B@5>o(B
$B$J%Q%1%C%H$KBP$9$kHfN((B) $B$rD4$Y$F$_$F$O$$$+$,$G$7$g$&$+!#(B
