From owner-FreeBSD-users-jp@jp.freebsd.org  Mon Jan 19 11:21:46 1998
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Date: Mon, 19 Jan 1998 11:21:48 +0900 (JST)
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From: yiwakiri@st.rim.or.jp (Youichi Iwakiri)
To: FreeBSD-users-jp@jp.freebsd.org
In-Reply-To: Your message of Mon, 19 Jan 1998 10:49:43 +0900 (JST).
	<19980119014943.2261.qmail@i386.honkan3.tmca.ac.jp>
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Subject: [FreeBSD-users-jp 23411] Re: Ethernet Cabling Questions.
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$B$$$o$-$j(B

nws830@ca2.so-net.or.jp wrote:
 >$B<ALd$=$N(B1:
 >10Base-T$B$G!"FsE@4V$r@\B3$9$k$N$K!"4V$K%9%$%C%A%s%0%O%V$rBt;3(B
 >$BF~$l$k$H(B, $B%9%$%C%A%s%0%O%V4V$N5wN%$@$1$r0lDj$KJ]$C$F$*$l$P(B
 >$BDL?.=PMh$k5wN%$O4v$i$G$b?-$S$k$b$N$J$N$G$7$g$&$+!)(B
 >          SWHUB  SWHUB   SWHUB  SWHUB  SWHUB   SWHUB
 >Point A ----##-----##-----##-----##-----##------##----- Point B

 $B$*;H$$$N(BSwitch$B$N;EMM$,J,$+$i$J$$$N$G$J$s$H$b8@$($^$;$s$1$I(B...
 switch$BFb$K%U%l!<%`A4BN$r0lEY%P%C%U%!%j%s%0$9$k$s$8$c$J$-$c(B
 $BDL>o$O!"(B5-4-3 rule$B$K=>$C$F$l$P$$$$$s$8$c$J$$$G$9$+(B?
 #5: $B7PM3$9$kF1<4%;%0%a%s%H(B+$B%j%s%/%;%0%a%s%H$N9g7W?t(B
  4: $B7PM3$9$k%j%T!<%??t(B
  3: $B7PM3$9$kF1<4%;%0%a%s%H?t(B

 >$B<ALd$=$N(B2:
 >$B7zJ*$NCf$N$"$k>l=j(BA$B$+$i(B(100meter$B0JFb(B)$BN%$l$?>l=j(BB$B$X(B,
 >$BG[4IEy$N4X78$G%1!<%V%k@~:`$r$"$^$jK\?tBt;30z$CD%$k$3$H$,(B
 >$B=PMh$J$$>l9g$K(B, $BNc$($P(B 10BaseT $B$r(B5 $BK\0z$CD%$j$?$$$,(B Category V $B$N(B
 >$B%1!<%V%k$r(B1$BK\$@$10z$$$F:Q$^$;$kJ}K!$H$7$F(B
 >   10BaseT                                          10BaseT
 >Cable 1 ---|S|                             |S|--- Cable 1
 >Cable 2 ---|W|           100BaseT          |W|--- Cable 2
 >Cable 3 ---|H|-----------------------------|H|--- Cable 3
 >Cable 4 ---|U|                             |U|--- Cable 4
 >Cable 5 ---|B|                             |B|--- Cable 5
 >$B$H$9$k$3$H$,2DG=$G$"$j$^$9$+(B?

 $BBg>fIW$@$H$*$b$&!#(B

 >$B$^$?!"FC$K:8B&$N(B5$BK\$N%1!<%V%k$,F10l$N%j%T!<%?!<%O%V(B($B%@%`%O%V(B)
 >$B$N%]!<%H$+$i=P$FMh$?@~$G$"$k>l9g$K$bBg>fIW$G$7$g$&$+(B?
 >($B1&B&$N(B5$BK\$OC<Kv$G$"$k(BPC$B$@$H$7$^$9(B.)

 |H| ----- |S|
 | | ----- |W|
 |U| ----- |H|
 | | ----- |U|
 |B| ----- |B| 

 $B$C$F@\B3$G$9$+(B?
 $BL5M}$G$9!#(B

 >$B$^$?!">e5-$,Bg>fIW$G$"$k$H$-!"$5$i$KJ#;(EY$rA}$9$o$1$G$9$,(B,
 >$BNc$($P(B10BaseT$B$r(B16$B%]!<%H$b$A!"(B100Base-T$B$r(B2$B%]!<%H;}$C$F$$$k(B
 >$B$h$&$J%9%$%C%A%s%0%O%V$,$"$k$H$7$F!"(B2$BE@4V$r(B2$BK\$@$1(BCategory V
 >$B$G@~:`$rDL$;$k$H$-$K(B,
 >
 >   10BaseT                                          10BaseT
 >Cable 1 ---|S|                             |S|--- Cable 1
 >Cable 2 ---|W|           100BaseT          |W|--- Cable 2
 >Cable 3 ---| |-----------------------------| |--- Cable 3
 >.....   ---|H|-----------------------------|H|--- .......
 >Cable15 ---|U|           100BaseT          |U|--- Cable15
 >Cable16 ---|B|                             |B|--- Cable16
 >$B$H$d$C$F$bNI$$$N$G$7$g$&$+!)(B

 $BL5M}$G$9!#(B
 #VLAN$B;H$C$F%M%C%H%o!<%/J,$1$k$s$@$C$?$i(BOK$B$@$1$I(B
 ##$B%m!<%I%P%i%s%7%s%0$C$F(Bswitch$B$G=PMh$^$7$?$C$1(B? > $BC/$+$7$C$F$^$9$+(B
