Tuesday, December 12

Mesh Network

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What is a Mesh Network?

In most modern networks are interconnected nodes (both logically and physically) in either a star-arrangement (where each node directly connected to a central switch, hub or server) or a bus configuration (where each node is connected to a central line connected to a central switch). Both configurations are those we know well, low cost and generally reliable. However, in both cases so that a single broken link a node of the network can isolate.

A mesh network is a new kind of arrangement where each node is connected to at least two other nodes (and potentially with all other network nodes, we speak of fully connectedâC ~ AC (TM)). That means more cabling (or more wireless devices) and a higher overhead, but it also ledit eennetwerk that restores itself automatically when a connection is lost somewhere, so the services on all nodes simply continue running.

The strength of mesh networks is the reliability. A mesh network has no stand-alone routers, instead all nodes function as routers for each other. The data travels from node to node in a process that AC ~ hoppen-C (TM) is called.
The first and best example of a mesh network is the Internet. Information that travels over the network is continually passed from one router to the next until it reaches its destination. The Internet is often represented as a cloud (today is the English term cloud-C ~ AC (TM) very popular), because in principle, billions routes are a signal to follow, before it is virtually impossible to predict which route to final.
Wireless networks are designed to be ideal as mesh, ad hoc and rapid because it is to roll out. Wireless mesh nodes are small radio transmitters that function as wireless routers and use existing WiFi standards (802.11a, b and g).
A wireless mesh network has a single access to the Internet need to be. That connection is called the backhaul. Small wireless networks without special configuratiue handle the backhaul. With larger mesh networks, including networks for cities and larger companies use, certain nodes are designated as specific backhaul nodes. The remaining nodes then send all outgoing information to a backhaul node, which then no extra hops to the access point and sends the Internet.

Mesh in action

In early 2007 the Communications and Information Technology Commission of Saudi Arabia <<, during the preparation of the annual pilgrimage to Mecca, to ISP Bayanat Al-Oula for a temporary wireless network to set up the two million pilgrims had to offer free internet access. She chose a network of zoC (TM) s 70 routers in a mesh configuration, which in less than 60 days were up.

Advantages and disadvantages of mesh networks
*- They restore himself as one of the nodes fails, another takes its network tasks.
* – They are ideal for places where no Ethernet connections are available, such as outdoors, in warehouses and transportation environments.
* – They are ideal in environments where the wireless signal or not freely available everywhere and there is now blocked.
* – The network is not only larger but also faster as more nodes are added.
* – LANs are faster because of local data via a central server without first having to walk.
* – They are still in development.
* – New standards are not adopted.
* – Wireless links are inherently less brtouwbaar. Because that problem with every hop increases, the size of fully wireless meshes still limited.


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