Date: Mon, 6 May 1996 22:15:29 +0000 From: "Scott A. Miller" <samiller@fox.nstn.ca> To: Benjamin Lewis <blewis@vet.vet.purdue.edu> Cc: questions@freefall.freebsd.org Subject: Home networks (or 10Base-T ways to annoy your spouse) Message-ID: <199605070216.XAA17351@Fox.nstn.ca>
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Hi Ben,
In response to your recent posting to the FreeBSD questions mailing
list I gave you some (biased...of course!) info about setting up a
small LAN.
I FOUND IT! Here's an excerpt from the FAQ posted to the
comp.dcom.cabling newsgroup that should either answer a lot of
questions about cabling with 10Base-T (or else you'll give up the
idea completely...)
I'm CCing this to the list because it's just such useful stuff. (&
violating a copyright or two, no doubt.)
============== excerpt follows =================
Subject: 10.0 Birds and Bees (Plugs vs. Jacks)
The EIA/TIA specifies an RJ-45 (ISO 8877) connector for Unshielded
Twisted Pair (UTP) cable. The plug is the male component crimped
on the end of the cable while the jack is the female component in
a wall plate or patch panel, etc. Here is the pin numbering to
answer the question, where is pin one?
Plug Jack
(Looking at connector (Looking at cavity
end with the cable in the wall)
running away from you)
---------- / ----------
| 87654321 | | 12345678 |
|__ __|/ |/_ /_|
|____| |/___|
------------------------------
Subject: 11.0 Standard Networking Configurations
With reference to T568B above;
ATM 155Mbps uses pairs 2 and 4 (pins 1-2, 7-8)
Ethernet 10Base-T uses pairs 2 and 3 (pins 1-2, 3-6)
Ethernet 100Base-T4 uses pairs 2 and 3 (4T+) (pins 1-2, 3-6)
Ethernet 100Base-T8 uses pairs 1,2,3 and 4 (pins 4-5, 1-2, 3-6, 7-8)
Token-Ring uses pairs 1 and 3 (pins 4-5, 3-6)
TP-PMD uses pairs 2 and 4 (pins 1-2, 7-8)
100VG-AnyLAN uses pairs 1,2,3 and 4 (pins 4-5, 1-2, 3-6, 7-8)
------------------------------
Subject: 12.0 Ethernet 10Base-T Cabling
12.1 Ethernet 10Base-T Straight Thru patch cord (T568B colors);
RJ45 Plug RJ45 Plug
========= =========
/----T2 1 ........ White/Orange . 1 TxData +
pair2 \----R2 2 .......... Orange ........ 2 TxData -
/--T3 3 ....... White/Green .... 3 RecvData +
/ R1 4 Blue 4
pair 3 \ T1 5 White/Blue 5
\--R3 6 .......... Green ........... 6 RecvData -
T4 7 White/Brown 7
R4 8 Brown 8
12.2 Ethernet 10Base-T Crossover patch cord;
This cable can be used to cascade hubs, or for connecting
two Ethernet stations back-to-back without a hub (ideal for
two station Doom!) Note pin numbering in item 10.0 above.
RJ45 Plug 1 Tx+ -------------- Rx+ 3 RJ45 Plug
2 Tx- -------------- Rx- 6
3 Rx+ -------------- Tx+ 1
6 Rx- -------------- Tx- 2
12.3 Ethernet 10Base-T to USOC Crossover patch cord;
RJ45 8-pin Plug 1 ---White/Orange--- 2 USOC 6-pin Plug
^ 2 ------Orange------ 5 ^
3 ---White/Green---- 1
6 ------Green------- 6
12.4 Crossover Implementation
A simple way to make a crossover patch cable is to take a
dual-jack surface mount box and make the crossover between
the two jacks. This allows using standard patch cables, and
avoids the nuisance of having a crossover cable find its way
into use in place of a regular patch cable.
12.5 Stranded Patch Cables
The color code used in stranded patch cables is different from
solid-conductor cables. For NorTel Digital Patch Cable (DPC),
the coding is;
Pair 1: Green & Red
Pair 2: Yellow & Black
Pair 3: Blue & Orange
Pair 4: Brown & Gray
============== excerpt ends =================
Long-winded, eh? Cut & Paste is wonderful!
Hope this helps lots of people!
----------------------------------------------------------
Scott A. Miller
Senior Analyst, | Director: Technical Services
Reality...Processing | Interimage
| http://www1.prestech.net/interimage
----------------------------------------------------------
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