Archive for the ‘E’ Category

Extranet

September 10, 2007

An extranet is made up of a private group of computers that are not part of the same local area network (LAN) or wide area network (WAN) but whose members can all access information via a secure login. Businesses often have extranets to provide services and functionality to customers, clients, suppliers, etc.

By Sarah at UK Broadband Finder
Read my Broadband Glossary disclaimer

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Encryption

August 19, 2007

Encrypted data can be sent over the internet without unauthorised people reading it while it is en route. The form encrypted data takes is called cypher text. Encryption is used particularly for e-commerce as it means credit card information can be kept private.

By Sarah at UK Broadband Finder
Read my Broadband Glossary disclaimer

Ethernet Switch

July 13, 2007

An Ethernet switch allows you to send data to specific computers on your local area network (LAN) rather than to all. It will “read” a data packet, work out where it is meant to be going and send it on only to its intended recipient. It can enable transmission of data between several pairs of computers at the same time, at high speeds.

A LAN based on Ethernet switches will be faster and more secure than one based on an Ethernet hub. This is because with a hub, any data sent is transmitted to all PCs in the network. This slows down the network. Additionally, if two computers in the LAN try to send data at the same time, it causes a collision – and all computers on the network then go through a specific routine to fix it – again, causing speed reductions.

By Sarah at UK Broadband Finder
Read my Broadband Glossary disclaimer

Ethernet Hub

July 13, 2007

An Ethernet hub connects all the computers on a LAN (local area network). The Ethernet hub forwards packets of information on to all computers in the network. Unlike an Ethernet switch, it cannot identify the specific destination of a packet of data, so it can only forward it to the whole network. This can cause the network to go slow.

If two or more computers in the network try to transmit data at the ame time it will cause a collision  Рall computers on the network then go through a specific process to resolve the collision, further slowing the network.

By Sarah at UK Broadband Finder
Read my Broadband Glossary disclaimer 

Ethernet

July 12, 2007

Ethernet is a standard originally developed by the Xerox Corporation for use in local area networks (LANs). It can link several devices on one cable – all devices linked to the cable can communicate with any other device on the cable.

Many Ethernet networks originally used coaxial cable (and this is still used in some very large ethernet LANs) but now ethernet networks commonly use twisted pair wires.

Ethernet originally  transmitted data at up to 10Mb. However there is also now Fast Ethernet, which transmits at up to 100Mb, and Gigabit Ethernet transmitting at up to 1000Mb.

The Ethernet protocol is set out in the standard IEEE 802.3

By Sarah at UK Broadband Finder
Read my Broadband Glossary disclaimer

The Exchange

June 23, 2007

The exchange, or telephone exchange, is a collection of switches housed in one place that connects phone calls. Phone lines from consumers or businesses in the local area (or within the “local loop”) meet here.

If you have broadband delivered via a phone line (rather than cable) the distance between you and the exchange can affect your broadband speed.

By Sarah at UK Broadband Finder
Read my Broadband Glossary disclaimer