From owner-freebsd-questions Mon May 6 19:16:34 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id TAA00796 for questions-outgoing; Mon, 6 May 1996 19:16:34 -0700 (PDT) Received: from Fox.nstn.ca (fox.nstn.ca [137.186.128.12]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id TAA00787 for ; Mon, 6 May 1996 19:16:31 -0700 (PDT) Received: from Screamer (ts4-03.ott.iSTAR.ca [204.191.144.83]) by Fox.nstn.ca (8.7.5/8.7.3) with SMTP id XAA17351; Mon, 6 May 1996 23:16:14 -0300 (ADT) Message-Id: <199605070216.XAA17351@Fox.nstn.ca> Comments: Authenticated sender is From: "Scott A. Miller" To: Benjamin Lewis Date: Mon, 6 May 1996 22:15:29 +0000 Subject: Home networks (or 10Base-T ways to annoy your spouse) CC: questions@freefall.freebsd.org Priority: normal X-mailer: Pegasus Mail for Windows (v2.23) Sender: owner-questions@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk 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 ----------------------------------------------------------