Showing posts with label Network Topology. Show all posts
Showing posts with label Network Topology. Show all posts

Wireless Networks and Wi-Fi Technology

What is Wi-Fi?

The Wi-Fi is the name of a popular wireless networking technology that uses radio waves to provide wireless high-speed Internet and networks connections.The wireless networking market is growing rapidly as business discover the productivity benefits of going wire-free.The increased mobility that WiFi networks offer has proved beneficial in operations throughout manufacturing facilities,warehouses transportation depot,hotel,airports,hospitals,collage,large enterprise as well as convention centers.In the corporation,
Wireless Networks and Wi-Fi Technology
conferance rooms,public area,and branch office constitute ideal venues for wireless LANs(WLANs)

WiFi solutions Installs Services:

  • Enterprise Wi-Fi Hotspots
  • Outdoor Broadband Wireless/Wi-Fi
  •  High Capacity WiMAX
  • Multi-Service Mesh Networks
  • Point to Point Wirless
  • Point to Multi-Point Wireless
  • Fixed Wireless Access
  • Wireless VOIP
  • Mobile Wireless Access
  • Wireless Video Surveillance.
  • 4.9GHz Public Safety Soluations
  • Business customer aggregation
  • Enterprise/Cumpus Inter-building connectivity
  • City -Wide municipal Networks
  • Wireless Back haul/Circuit Replacement
  • Wireless Video Surveillance
  • Public Safety Solutions

Common applications include of Wi-Fi:

  • Office Buildings
  • Business customer aggregation
  • Hotels
  • Resorts
  • Beach Fronts
  • Contruction Sites
  • Stadiums
  • Enterprise/Campus Inter-building Connectivity
  • Recreational Parks
  • Wireless Backhaul/Circuit Replacement
  • Condominiums
  • Colleges
  • Day Care
  • Marinas
  • Large enterprise
  • Public area and
  • Branch office

Advantage of Network Topology

Bus Topology:

A network which consists of a single,long cable to which computer attach is known as bus topology.Any computer attach to a bus can send a single down the cable and all computers revives the single.
bus topology
Bus Topology

Advantages of Bus Topology:

  • The architecture of this layout is very simple and easy to maintain.
  • It is easy to extend the system simply by connecting additional nodes to the main cable.Signal amplifier (repeats)  can be added in case of extensive addition.

Disadvantages of Bus Topology:

  • There is a difficulty in fault diagnosis .Since the control of the network is not is centralized so it is difficult to detect a fault.
  • For fault repair if it is at the node the it can be rectified,but when the fault is in the network medium itself,then it is necessary to disconnect the entire segment.

Tree Topology:

A tree topology is a type of network topology that includes at least three specific levels in a topology hierarchy. Tree topologies are valued for their scalability and accessibility for troubleshooting.
Tree Topology
Tree Topology

Advantages of Tree Topology:

  • The Tree Topology is divided into sub unit,it is easier to extend the system.
  • In this process it is possible  to disconnect whole branches of networks from the main structure.

Disadvantages of tree Topology:

  • The network is dependent on the root,so when the headed devices fails to operate the entire networks.

Mesh Topology:

In a Mesh Topology ,every device has a dedicated point to point link to every other device.Mesh networking is a type of network topology in which a device (node) transmits its own data as well as serves as a relay for
Mesh Topology
Mesh Topology
other nodes. Routers are used to provide the best and most efficient data path for effective communication. In the event of a hardware failure, many routes are available to continue the network communication process.

Advantages of Mesh Topology:

  • Mesh Topology is robust.If one link becomes unusable,it does not incapacitates the entire system.
  • Point to point links makes fault identification and fault isolation easy.

Disadvantages of Mesh Topology:

  • The main disadvantage of a mesh are related to amount of cabling and the number of I/O ports required.
  • The hardware require to connect each link can be prohibitively expensive.

Network Topology

What is Network Topology?

Network Topology
Network Topology
A network topology refers to the physical layout of the network in which all devices i.e.all the hardware that makes up the network,are connected.The points of connection to the network by the station are call nodes or link station.
Example is a local area network (LAN): Any given node in the LAN has one or more physical links to other devices in the network; graphically mapping these links results in a geometric shape that can be used to describe the physical topology of the network. Conversely, mapping the data flow between the components determines the logical topology of the network.
Basic categories of network topologies:
  • Physical topologies
  • Logical topologies

Physical Topology:

The shape of the cabling layout used to link devices is called the physical topology of the network. This refers to the layout of cabling, the locations of nodes, and the interconnections between the nodes and the cabling. The physical topology of a network is determined by the capabilities of the network access devices and media, the level of control or fault tolerance desired, and the cost associated with cabling or telecommunications circuits.

Logical topologies:

The logical topology in contrast, is the way that the signals act on the network media, or the way that the data passes through the network from one device to the next without regard to the physical interconnection of the devices. A network's logical topology is not necessarily the same as its physical topology. For example, the original twisted pair Ethernet using repeater hubs was a logical bus topology with a physical star topology layout. Token Ring is a logical ring topology, but is wired a physical star from the Media Access Unit.

There are several types of topographical design and strategies are used to implement different networks.The types are-
  • Star Topology
  • Ring Topology.
  • Bus Topology
  • Tree Topology
  • Mesh Topology
  •  Hybrid Topology
  • Point-to-point Topology
  •  Daisy chain Topology

Star topology:

Star Topology
Star Topology
When all computers attach to the central point is called star topology.It is a star shaped network resembles the spokes of a wheel.The centre of the star network is often call a hub or central controller.A typical hub consists of an electronic device that accepts data from the sending computer and delivers it to the appropriate destination. 
Advantages of the Star Topology:
  • Here,in star topology, failure of a single connection disconnects one node only from the healthy network.
  • Since here the central node is connected directly to every other node,the faults when occur can be easily detected and isolated.
Disadvantages of the Star Topology:
  • Although the cost of the cables is small,but congestion in cables ducts,maintenance and installation problems increase the costs considerably.
  • It is central node dependent and if the central node fails,the entire networks becomes stall.  

Ring Topology:

The network that arranges computers to be connected in a closed loop is called Ring Topology.Here a cable connects the first computer to a second computer,another cable connects the second computer to a third and
Ring Topology
Ring Topology
so on,untill a cable connects the final computer back to the first.
Advantages of Ring Topology:
  • Since one cable connecting each node,the space required in the building for wiring is minimum.
  • In a ring topology although the length of cables is that of a bus,but here less connections are needed and hence reliability is increased.
Disadvantages of Ring Topology:
  • Since the failure of one node affects all the other,fault diagnosis is therefore very difficult.
  • It is not possible to shut down only a small segments of the ring keeping the majority of it in normal working condition.

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