Fastest Transmission through Optical Fiber Its uses and features

It is the means of most modern and advanced transmission. Increasingly used to form the "backbone" of large networks. Data signals are transmitted through light pulses and can travel great distances (of the order of kilometers) without having to amplify the signal.

By its nature, this type of signal and cabling is immune to electromagnetic interference and its high bandwidth (transmission rate), can transmit large volumes of information at high speed.

These advantages make the optical fiber the ideal choice for high speed networks over long distances, with considerable data flows and in installations where information security is an important factor.

One drawback is that the most expensive hardware. Again, not because of the cost of the cable itself, but for the price of the connectors, the equipment required to send and detect light waves and the need for qualified technicians for installation and maintenance of cabling system.

Wire cable or Twisted Pair Cable Characteristics and Use

The twisted pair comprises at least two insulated conductors twisted around each other and protected by an insulating cover. A cable of this type usually contains 1, 2 or 4 pairs, ie 2, 4 or 8 threads.
Stranded wires or two-wire cabling system are used worldwide for telephony. It is a well known technology. The cable is fairly inexpensive and easy to install and reliable connections. Its major advantages are therefore their availability and low cost.

As for the disadvantages are the large signal attenuation with increasing distance and are very susceptible to electrical interference. Therefore instead of using parallel wire cable twisted and is used to avoid interference, the set of pairs is shielded with a conductive mesh does. This raises the cost of the cable itself, but its installation and continuous connection still cheaper than in the case of coaxial cables. Both the EtherNet networks like Token Ring can use this type of cable.

Coaxial Cable as transmission Medium Uses and Features

Until recently, was the most common means of transmission in local networks. The coaxial cable consists of two concentric conductors separated by a dielectric and protected from the outside by an insulator (similar to TV antennas).
There are different types of coaxial cable as networks or needs more protection or distance. This type of cable just use the EtherNet networks.

There are two types of coaxial cable:

•     Thick wire or thick wire: it's bulky, expensive and difficult to install, but allows you to connect a larger number of nodes and achieve greater distances.

•     Thin wire or thin wire, also known as cheapernet be more economical and easy to install. Only used for networks with a reduced number of nodes.

Both types of wire may be simultaneously used in a network. Speed ​​signal transmission by both is 10 Mb.

Advantages of coaxial cable:

1. The signal protection against electrical interference due to other computers, photocopiers, motors, fluorescent lights, etc.
2. You can cover relatively large distances between 185 and 1500 meters depending on the type of cable used.

What is Transmission medium and Why We use it in Networking

For transmission medium is the physical medium used for sending data over the network. Most existing networks currently used as a transmission medium coaxial cable or twisted pair wire cable and fiber optic cable. The wireless medium using radio waves, microwaves or infrared is also used, these media are slower than cable or fiber optics.

Or any physical medium that can carry information in the form of electromagnetic signals can be used in local area networks as the transmission medium.

Transmission lines are the backbone of the network, including information between nodes is transmitted. To make the transmission of information several techniques are used, but the most common are: baseband and broadband.

The different types of network: EtherNet, Token Ring, FDDI, etc. They can use different cable types and communication protocols.

Some Features or Characteristics of a local network

The computers on a local network can be large computers or personal computers, with different types of peripherals. Although there are many types of local networks among them there are some common characteristics:

• A common communication medium through which all devices can share information, software and hardware, regardless of the physical location where the user or device is found. Local networks are contained in a small physical area: a building, campus, etc.

•     A very high transmission speed so that it can adapt to the needs of users and equipment. The team from the local network can transmit data at the maximum speed that can communicate network stations, usually one Mb per second.

•     A relatively short distance between stations between a few meters to several kilometers.

    The possibility of using normal cable connection.
    All devices can communicate with the rest and some of them can operate independently.

•     A reliable system with a very low error rate. Local networks usually have their own system of detection and correction of transmission errors.

    Flexibility, the user manages and controls its own system.

The two basic types of devices that can be connected to a local network are workstations and servers:
'A workstation is a computer from which the user can access network resources.

-A Server is a computer that allows other computers to access the resources available. These servers include:

        dedicated: they are only used to provide resources to other nodes
        not engaged: they can work simultaneously as a server and workstation.

There's kind of a little special server that will be discussed separately, is the communications server. This server allows any of the computers on a network to communicate with external devices or systems. In turn, will be divided into two groups: bridges and gateways.

Generally, in a network node requesting a service or initiates communication, is called client. The node will respond to the request is called a server.

Network Easy definition the Interconnection of nodes

A network is a set of interconnected computers that can communicate by sharing data and resources regardless of the physical location of the various devices. Through a network can execute processes on another computer or access your files, send messages, share programs.
Computers are often connected by cables. But if the network covers a wide region, the connections can be made via telephone lines, microwave, fiber optic lines and even satellites.

Each active device connected to the network is called a node. An active device is one that intervenes in communication autonomously, without being controlled by another device. For example, certain printers are autonomous and can provide service on a network without connecting to a computer that handles; these printers are network nodes.

Local area networking Some basics and Tips for LAN

Introduction
Usually, companies go to the computer to satisfy their information needs usually start with a few computers and a few peripherals. But little by little they are expanding both hardware software resources as resources for information management. This expansion often leads associated problem of redundancies, both software, data, hardware, etc. The Local Area Network (LAN) allows the interconnection of a number of computers and peripherals in this way can be interconnected and share resources.

COMPUTER NETWORK

It is the set of terminal computers and devices that communicate with each other, providing the necessary for users from different locations (local or remote), in similar situations have access to information environment.

PURPOSE
Share files and programs.
Share network resources.
Share databases.
Improve communication users.
Groupware and workflow.
Centralized management.
Improve corporate structure.

Local area network (LAN)
A LAN is a network that connects computers in a relatively small predetermined area (such as a room, a building or set of buildings). LANs can be connected to each other via telephone lines and radio waves.The local area network will allow us to share databases, software and peripherals such as a modem, printer, scanner, among others; making available other media such as email and chat.

In addition, a local area network bears a significant saving both money because there is no need to buy many peripheral, less paper is consumed, and an Internet connection can use a single shared telephone connection for several networked computers; and time, as management information and work is accomplished.

Local networks allow interconnected computers that are within the same building (either within the same building as one that is at a distance), but always bearing in mind that the physical environment that unites can not have more than a thousand meters.Furthermore, it is noteworthy that a LAN can be connected to another through a WAN (WAN Wide Area Network), which serve other communication networks such as the telephone network to transmit information between the communicating computers.

Creating a LAN

When you have several computers, it may be desirable to connect them together to create a local area network (LAN). Contrary to what people believe, the cost of setting up a network with these characteristics is very small.

There are two main types of LAN architecture:

• The connected networks based on Ethernet technology, which represent the majority of local connections. Often are referred to as RJ45 networks, usually RJ45 Ethernet networks using cables.

•     Wireless networks, which generally use the WiFi technology, correspondent this guy.

To create a Network RJ45 need:

Several computers running the Windows operating system installed (you can have two computers with different versions of Windows on the same network);

    Ethernet cards connected to a PCI or ISA port (with an RJ45 connector) or integrated into the motherboard. Make sure the diodes on the back of the network card, if applicable, are lit when the computer is turned on and that the cable is connected. There are also network adapters for USB ports, especially in the case of wireless network adapters.

    RJ45 cables for connecting networks;

    A hub device that can connect RJ45 cable from different computers on the network, which are not expensive (worth approximately € 50), a switch or, alternatively, a crossover cable when connecting only two teams.

Architecture

To create a LAN RJ45, it is recommended to adopt a configuration structure known as "star" computers are connected to the hub via the RJ45 cable. A hub is a device that transfers data from one computer to another. Your choice must be made depending on the number of connected computers so that sufficient outlets (called "ports") in the hub.

In the case concerned an extensive network or one with considerable width requirements band, a switch is a more convenient option as it can distribute packets only to the relevant teams, whereas a hub systematically sends to all connected equipment.
If you are connecting only two teams, may obviate the use of hub connecting directly both teams with an RJ45 crossover cable.

Sharing resources on LAN
To share a folder all the files that are in it or superimposed when be shared.
These steps are to share files between computers on a network. Use remote access if you want to share on the Internet. Go to the folder you want to share and click on it with the right mouse button. Choose Properties. By clicking above on the lapel Share. Click on the button called also share. By clicking on the dropdown menu above and click All. Then click Add that to the right button. You see that is added below the name All. Click it. Reading: a menu with two options (permission levels) appears. Other users on the network can open files in this shared folder, but not to change or delete. Reading and writing. Any network can open, change, or delete files in the folder. Choose what you prefer and click the Share button below.
NOTE: If at any time you want to change the permission level repeat these steps and modify this. Close the window by pressing Done. Then click Close in the Properties window to which you return.
 
Conclusions
In short, the benefits of using a computer network local area are: You can share peripherals such as: are printers, modems, scanners, and other devices. You can share large amounts of data by using transmission network databases. This data redundancy is avoided and facilitating access and update data. The network becomes a mechanism for communication among users connected to it, as it allows sending messages through the use of email, either between users on the local network or between users on other networks or systems, scheduling meetings or exchanging files of all types. The efficiency of computers increases, by providing the user an entire system that makes queries faster and comfortable. It is a complete security system, can be prevented users from accessing certain areas of specific information, or information that can read but not modify it. The network access is controlled by user names and passwords. The control of users accessing the network is performed by the operating system. The control of users accessing the information is carried out management software database being employed.
The network operating systems try to give the impression that remote resources accessed by the user are local to the computer from which the user is working. For example, a user may be using the information from a database. The user at any time has knowledge of whether the information which is being accessed is on your own computer or in another within your local network or anywhere else in the world.