From: "ICS_Roscher" <ICS_Roscher@...>
To: "Ali" <icsukkur@...>
Subject: ICS Re: FUN OF COMPUTER NETWORKING....[PART-VI]
Date: Sun, 4 Jun 2006 10:47:05 +0200

FUN OF COMPUTER NETWORKING

Dear Ali,

thank you very much for your information. I've some more time for discussion
on the weekend. We are using the Ethernet since more than 10 years as local net in our enterprise as well as for our multiprocessor systems (BrainScope, HeartScope). We are using coax-cable for the communication with success. Some devices using twisted pair. What is the advantage of this twisted pairs?

I'm interested in a discussion on the application of such communication
technologies, especially in real-time applications.

Best regards

Günther
Klein Ammensleben, June 4. 2006


ICS Dr. G. Roscher GmbH
Dr.-Ing., Dipl.-Math. Günther Roscher
CEO
Am Kirchberg 6
D - 39326 Klein Ammensleben
Tel.: +49 39 202/52 12-6
Fax: +49 39 202/52 12-8
www.ICSRoscher.de
ICS_Roscher@...

 

Dear Günther,   Twisted Pair Cable The most common form of Ethernet these days is 10baseT, which carries data over unshielded twisted pair (UTP) cables, generally referred to as Category 5, or Cat 5 for short. Category 3 is all that's required for most installations, but the cost and inconvenience of cabling is such that few people bother, and most put in the higher-specification cabling which is more future-proof. The advantage of using twisted pair is that it's very widely available, it will carry other traffic (eg, ISDN) and network cards are extraordinarily cheap. The downside is that you almost invariably need a hub (see below). Although you can use a crossover cable to connect two computers, if you want to add another computer or device you must have a hub, so you might as well plan for it at the start. Coaxial Cable Another fairly common form of Ethernet is 10base2, or thin Ethernet (also thinnet). This is a coaxial cable somewhat thinner than that used for TV aerials, with a bayonet connector (BNC) crimped on to the end. To attach this to a card you need a T-piece and a terminator. Although connecting straight to the BNC connector on the network card might work, it's fairly unlikely, and the specification calls for the additional bits. The big advantage of thinnet is its simplicity. It requires no hubs - you just start with a terminator at one end of the cable, connect as many PCs as you like along its length, and finish with a terminator at the other end. Easy. The downsides are that the cable is relatively expensive, you can't use 100 megabit (which is probably irrelevant in a home context), the cable is more susceptible to damage, you need terminators and T pieces, and the cards are slightly less common. This sounds like a big deal, but in practice thinnet is still very cheap and easy enough for the complete novice to use. Best Regards, Ali, Founder, http://groups.yahoo.com/group/my_itclub/

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