NAJTEL - Sistemi tehničke zaštite

SCA - Computer and telephone networks

Brands of equipment and software you use: Panasonic, Cisco, Telsey , Legrand , Krone , Draka.

Computer networks allow communication between each computer using a permanent or temporary connection. Networking multiple computers requires special hardware, and software, as well as the knowledge of networking. Networking involves the realization of the connection to sharing resources, ideas or information between two points. Connecting computers in addition to using the cables and wires can be achieved, by means of radio techniques.

Local area network (LAN)

LAN (Local Area Network) is a computer network intended for the personal computer (PC - Personal Computer). LAN can only have one or hundreds of nodes (practically networked computers). Desktops are usually specialized networking cables with high bandwidth data (eg UTP cable) which is connected to the hub or switch. Communication takes place over TCP / IP protocol.

Most often networked computers, printers, scanners, photocopy machines, workstations, servers and other devices. LAN allows sharing of data, devices and applications. LAN for the lowest two layers of the OSI model. The most common standards are used as Ethernet, Token Ring and FDDI.

Types of computer networks

There are several types of networks, each defined network protocols, which are a set of rules for display, signaling, checking the data that are required for sending information over a network. Some of the most famous of those who are most in use are Ethernet, FDDI, Token Ring, Frame Relay, and Wi-Fi. Here are some basic facts about each of them.

Ethernet networking technology for LANs, based on the frame mode. This means that information is sent in packets that are adapted to send via the computer network. Defines networking and signaling for the physical layer and frame formats and protocols for the MAC and the data layer OSI model. Ethernet defines the protocols used to perform data transmission in the network. Ethernet, also known as IEEE 802.3, has become the most widespread standard for computer networks that began to ascend the early 1990s until today, where is the best and has almost completely replaced other networking technology for LANs such as Token Ring or FDDI .

FDDI was developed as the need for more reliable and faster data transmission over computer networks. On Fiber Distributed Interface is a set of ANSI protocols for sending digital data over optical fiber and less copper wire. FDDI networks are token network and supports speeds up to 100 Mbps. FDDI networks are typically based WAN.

Token Ring is a type of network that is schematically aligned in a circle. Token Ring is closely linked to the IEEE 802.5 specification because it arose from the Token Ring technology (developed by IBM), the identity and the negligible difference between the term usually includes the Token Ring and IEEE specification.

Frame Relay network is synchronized based on the HDLC protocol. Data is sent in HDLC packets. Frame relay is normally is used for encapsulation of data between local (LAN) and broadband (WAN) network.

Wi-Fi is a wireless way of networking computers, where data is vital two or more computers transmit using radio frequency (RF) and appropriate antennas. Most commonly used in LAN networks (WLAN), while in recent years increasingly offering wireless WAN network.

Network Computing Devices

Devices in computer networks are used to facilitate the transfer of data between two or more computers in a computer network. The most common are Bridge, Firewall, Gateway, Router, Switch, Hub, Repeater, Modem and Network cards. Here are some basic facts about each of them.

Bridge : A device that connects multiple networks through layers of data.

Firewall : Firewall is part of the hardware in the computer network has the ability to prevent improper data transmission over the network, which is forbidden by the safety police.

Gateway : A device located in the node computer networks used to communicate with another network that uses a different.

Router : A special device that determines the next network address on which to send packets of data, unlike the gateway can connect to different protocols.

Switch : A device that manages data flow between different parts of the local area network (LAN).

Hub : Connects multiple devices and thus virtual network between two or more computers.

Repeater : A device that amplifies the digital signal received from the network device.

Modem : A device that converts analog signals to digital and vice versa.

Network card : A device used for networking computers via UTP (Cat-5) cables, usually over Ethernet protocol.

Networking is required and necessary cables. Category 5e (Cat-5) cable with RJ45 connectors standard for today's computer networks. There are two types of Cat-5 cable, straight and crossover cable. Networking two machines, we need only one Cat-5 (crossover) and two network cards on two computers (or already integrated chip in the motherboard), which is also the cheapest option.

For larger networks we need additional devices such as Switch, while the Hub largely been overcome. For larger networks do not use a crossover cable but a straight (flat) cables. Crossover cables can only connect two machines directly. Straight cables are used to connect computers or more with a switch, making it more effective network.

Mode networking

Networking computers can be made by wire or by radio signals, usually with the help of Wi-Fi technology. Most used wire ways of networking the Ethernet networking, and networking using telephone and electrical systems. For wireless networking of computers are most uses Wi-Fi standard, while for connecting small devices such as mobile phones, for example, uses the Bluetooth standard.

Computer networks have greatly improved mode on the computer. With the networking you can share one printer or scanner between the two computers to share a single Internet connection for all computers in the network, access data from one computer to another (such as movies, pictures, music), etc.

There are several ways of networking that users can choose. The latest and most popular wireless networking, due to considerable simplicity and elegance (no cables), but low prices and higher speeds to be achieved by new technologies.

NAJTEL doo Podgorica

Professional security systems

SCA - Computer and telephone networks

Services

Manufacturers