Original Sender : "Markus Hui" <[EMAIL PROTECTED]>
---------------------------------
Additional Info :
http://www.combsnet.com/cable/Installing/making_cables.html
-----Original Message-----
From: Dedhi Sujatmiko <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Saturday, May 22, 1999 2:31 AM
Subject: [Compu-Mania] Cross Cable UTP
>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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