Posts Tagged ‘howto’
Lan Ethernet
Monday, September 12th, 2011
Whats the difference between DSL, Cable, LAN, Ethernet, etc?
The title is the question, ladies and gents.
DSL(Digital Subscriber Line) is a fast-growing alternative to dial-up networking to connect to the Internet. DSL uses regular Phone Lines to send digital broadband signals.
Fiber optic cabling is composed of the following components:
* The core carries the signal. It is made of plastic or glass.
* The cladding maintains the signal in the center of the core as the cable bends.
* The sheathing protects the cladding and the core.
Twisted Pair cabling is composed of the following components:
*Two wires that carry the data signals (one conductor carries a positive signal; one carries a negative signal). They are made of 22 or 24 gauge copper wiring.
PVC plastic insulation surrounds each wire.
Two wires are twisted to reduce the effects of electromagnetic interference (EMI) and crosstalk. Because the wires are twisted, EMI should affect both wires equally and can be cancelled out.
Multiple wire pairs are bundled together in an outer sheath. Twisted pair cable can be classified according to the makeup of the outer sheath:
*Shielded Twisted Pair (STP) has a grounded outer copper shield around the bundle of twisted pairs or around each pair. This provides added protection against EMI.
*Unshielded Twisted Pair (UTP) does not have a grounded outer copper shield. UTP cables are easier to work with and are less expensive than shielded cables.
Local Area Network (LAN) reside in a small geographic area, like in an office. A series of connected LANs, or a LAN connected across several buildings or offices, is called an internetwork.
Ethernet is a wired networking standard and is the most common networking architecture used in LANs (both in business and home networks).
Ethernet uses one or more of the following networking topologies:
* Physical bus, logical bus
* Physical star, logical bus
* Physical star, logical star
Ethernet supports the following cable types:
* Unshielded twisted-pair cables (UTP) with RJ-45 connectors. This is the most common transmission medium used for Ethernet.
* Fiber optic, most commonly used in high-speed applications such as servers or streaming media.
* Coaxial for older Ethernet implementations (often called thinnet or thicknet networks).
Token ring began as a proprietary networking standard developed by IBM. Now there is a public token ring networking standard created by the IEEE 802.5 committee and other vendors that manufacture token ring components.
Token ring was a popular networking architecture that is quickly being replaced by Ethernet. However, you may still encounter token ring in some existing networks.
Regards
http://yosellin.blogspot.com/
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