Original Sender : Dedhi Sujatmiko <[EMAIL PROTECTED]>
---------------------------------
Patching a crossover cable
Date: Sat, 21 Jun 1997 22:57:56 -0700
From: [EMAIL PROTECTED]
Can someone post the 10baseT RJ-45 connector pinout, with wire position and
color codes? I need to convert some standard cat-5 cables into crossover
cables either with my trusty soldering iron or an RJ-45 crimping tool, for
use in connecting two computers together via 10baseT. How many wires are
crossed, 2? 4? I know I need to cross the TX and RX lines, but I have been
out of LAN networking a while and don't currently have access to my
technical books (they are buried in storage)
2 Pair 10BaseT wiring are as follows:
Pins 1, 2 are pair 1
Pins 3, 6 are pair 2
Locate pin 1 as follows: it is the leftmost pin when you are facing the
connector with the locking clip down. There are two kinds of ports, MDI and
MDI-X; for two 10BaseT devices to communicate, the xmit of 1 must be the
rcv of the other; MDI-X implements this crossover automagically. A thru
cable's transmit pair is pair 1, the receive is pair 2 on both ends; for a
crossover cable, one end is as in thru, and the other end reverses (pair 1
is rcv, pair 2 is xmt).
Note that a crossover cable eliminates the need for a hub between two MDI
devices.
> 2. Is it technically/electrically correct to eliminate the terminators
> and T-connectors on a two computer network using thinnet(10base2). In
> other words, can I just use a single piece of thinnet if my NIC cards
> just have a male connector instead of a T connector built onto them?
> Terminators and T-connectors would seem unnecessary in this case where
> only two computers are involved.
Nope. Use a T at both ends, with terminators at both. Except for legacy, I
would advise against using 10Base2.
Addendum #1
Date: Sun, 22 Jun 1997 02:32:42 -0400
From: [EMAIL PROTECTED]
this is straight out of the Novell CNE study guide:
for 10base-T UTP crossover cable wiring:
pin_1 to pin_1, white/orange, transmit plus
pin_2 to pin_2, orange/white, transmit minus
pin_3 to pin_3, white/green, receive plus
pin_6 to pin_6, green/white, receive minus
Is it technically/electrically correct to eliminate the terminators and
T-connectors on a two computer network using thinnet(10base2)?
No. you still need the T-connectors and 50ohm terminators. the NIC *has* to
see that 50ohm impedance at each end of the network.. no matter how big or
small. At least those parts are cheap and easy to get :o)
Taken from the discussions in the hardware group mailing list.
Copyright � 1997 The Hardware Group. All rights reserved.
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