NetCom Parabola

Coaxial cable

2022-02-28T00:00:00.000+07:00

Coaxcial Cable / Kabel Koaksial

Kawat tembaga dan isolasi

Kabel koaksial terdiri dari dua kabel yang dilengkungkan oleh dua tingkat isolasi. Tingkat isolasi pertama paling dekat dengan kawat konduktor tembaga. Tingkat pertama dilindungi oleh penutup serat konduktor yang melindungi bagian atas dari pengaruh elektromagnetik. Sedangkan inti yang digunakan untuk transfer data berada di tengah yang selanjutnya ditutup atau dilindungi dengan pelindung ujung plastik untuk menghindari kabel tergores.

Jenis kabel koaksial

Beberapa jenis kabel coaxial lebih besar dari yang lain. Semakin besar kabel, semakin besar kapasitas datanya, jangkauannya lebih jauh dan tidak terlalu sensitif terhadap gangguan listrik.

Wireless

2022-02-27T20:27:00.000+07:00

Wireless

Network of computers connected via wireless.

Local Area Network of computers and other devices that communicate via radio signals or light waves. This system is usefulwhen connecting via cable or fiber optic connection is quite expensive, or to move the connection application.

Data Communication

Data communication technology by not using a cable to connect between the client and server. Generally Wireless LAN technology is similar to a computer network technologythat uses a cable (Wire LAN or Local Area Network). Wireless LAN technologies existthat use radio frequencies to send and receive data that would reduce the need ordependency relationships through cable. As a result, users have high mobility or flexibilityand is not dependent on a place or location. Wireless LAN technology also enables to form computer networks which may not be accessible by computer networks that use a cable.

Benefits of computer networks

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Benefits for users of computer networks

Resource sharing

Benefits for users of computer networks can be grouped into two categories, namely: for the needs of the company, and the network to the public. The main purpose of the establishment of a network in a company are :

Resource sharing is intended to make the entire program,equipment, in particular data can be used by anyone who is on the network.
Saving Money (Saving money / budget): The device and the data can be shared will make substantial budget savings, because it does not need to buy new devices to be installed in each and everyunit of computer

High reliability

Integrated Management Information System Office or the One-Stop Service System with client-servertechnology, Internet and intranet can be applied to computer networks, so it can provide a reliable, fast and accurate according to the needs and expectations.

The benefits of computer networks to the public.

Network computers will provide different services to users in homes compared with the services provided to the company. There are three things that form the main attraction at the individual computer networks are:

Access to information residing in other places (such as access tothe latest news, info e-government, e-commerce or e-business,everything is up to date).
Person to person communication (like e-mail, chat, videoconferene etc.).
Interactive entertainment (like watching tv shows on-line, radiostreaming, downloading movies or songs, etc.).

WAN network

2022-01-12T00:53:00.000+07:00

Wide Area Network

WAN

WAN (Wide Area Network) is a collection of LANs and / orWorkgroup are connected using a modem and a networkcommunication tool the Internet, from / to head office and branch offices, and between branch offices. With this network system, the exchange of data between offices can be done quickly and withrelatively low cost. This network system can use the existing Internetnetwork, to connect between headquarters and branch offices orwith Stand Alone PC / Notebook in another city or country.

Advantages Network WAN

Server can serve as the headquarters of the data bank branches.
Communication between offices can use the E-Mail & Chat.
Documents / Files are usually sent by fax or postal packet, can be sent via e-mail and transfer files from / to head office and branches with a relatively low cost and within a period of very rapid.
Updating Data Pooling Data and inter-office can be made everyday at the appointed time

Intranet & Internet

2022-01-11T19:44:00.000+07:00

Intranet and Internet

Intranet

An intranet is a private network (private network) that uses Internet protocols (TCP / IP), to share confidential information within a company or operating company to its employees.Sometimes, the term intranet refers only to services that are visible, namely the company's internal Web site. To build an intranet, a network must have some components that build the Internet, the Internet protocol (TCP / IP, IP address, and other protocols), the client and the server. HTTP protocol and several other Internet protocols (FTP, POP3, or SMTP)protocol is generally a component that is often used.

Internet

Typically, an intranet can be understood as a "personal version of the Internet", or as aversion of the Internet that are owned by an organization.If a corporation / business / institution to expose a portion of the internal network to theoutside community, this is called extranets. It usually does not remove all the content onthe intranet to the public to make the intranet to extranet. For example we're buyingsoftware, books, etc. from an e-store, then usually we can access the Intranet portion ofthe store. Business entity / company can block access to their intranet via a router and puta firewall. A firewall is a software / hardware that regulates a person's access into theintranet. Protection is done through a variety of network parameters if it's IP address, port number etc.. If the firewall is enabled then the access can be controlled so that we can only access a part of the company's Intranet which became known as an extranet.

LAN network

2022-01-06T00:46:00.000+07:00

Local Area Network

LAN network

LAN (Local Area Network) is a collection of computers, where there are multiple units of a computer (client) and a computer unit for data bank (server). Between each client and between client and servercan exchange files and use printers that are connected to each other in units of computers connected to the LAN network. Based on the cables used, there are two ways to create a LANnetwork, with BNC and UTP cable.

Advantages LAN Network

Exchange files can be done easily (File Sharing).
Use the printer can be done by all clients (Printer Sharing).

The data files can be stored on the server, so data can be accessed from any client securities according to the authorization ofall employees, which can be made based on the company's organizational structure so that data security is assured.

The data file in / out from / to a server can be in control.
The process of data backup becomes easier and faster.
The risk of data loss by computer viruses become very small.
Communication between employees can be done using E-Mail &Chat.
If one client / server connected to the modem, then all or mostcomputers on the LAN can access the network to the Internet orsend faxes through a modem.

Computer Networking Devices

2022-01-01T20:51:00.000+07:00

Networking Devices

LAN CARD

LAN CARD Network card (UK: network interface card or NIC also abbreviated network card) is a card that serves as a bridge from your computer to a computer network. NIC type in circulation, divided into two types, namely a physical NIC, and NIC that is logical. Examples of a physical NIC is the NIC Ethernet, Token Ring, and others, while the NIC that is logical is the loopback adapter and Dial-up Adapter. Known also as the Network Adapter. Each type of NICs are numbered addresses called MAC address, which can be static or can be changed by the user.
Physical NICGenerally in the form of physical NIC cards that can be plugged into a slot in the motherboard of the computer, which can be either a card with the ISA bus, PCI bus, EISA bus, MCA bus, or PCI Express bus. In addition to the form of cards that plug into the motherboard, the physical NIC can also be in the form of an external card bus card with USB, PCMCIA, serial bus, parallel bus or Express Card, thus improving mobility (for mobile users).

Physical NIC

Physical NIC cards are divided into two types, namely:• NIC card with a specific network media (Media-specific NIC) NIC cards that differentiate into several types based on the network media being used. An example is an Ethernet NIC, which may be a Twisted-Pair (UTP or STP), thinnet, or Thicknet, or even wirelessly (Wireless Ethernet).• NIC card with a specific network architecture (architecture-specific NIC) NIC cards that differentiate into several types, according to the network architecture is used. Examples are Ethernet, Token Ring, and FDDI (Fiber Distributed Data Interface), all of which use a different NIC. Ethernet NIC cards can be either Ethernet 10 megabits / second, 100 megabits / sec, 1 Gigabit / sec or 10 Gigabit / sec.NIC task is to convert parallel data stream in the form of computer bus into serial data that can be transmitted over the network media. The media commonly used, among other UTP cable Category 5 or Enhanced Category 5 (Cat5e), fiber-optic cable, or radio (if indeed without cable).Computers can communicate with the NIC by using several methods, namely the I / O is mapped into memory, Direct Memory Access (DMA), or a memory to be used together. A parallel data stream will be sent to the NIC card in advance and stored in memory in the card prior bundled into several different frames, before they can be transmitted over the network media. The process of making this frame, will add headers and trailers on the data about to be sent, which contains the address, signaling, or error-checking information. Frames will then be converted into electronic pulses (voltage, especially for copper wires), pulse-modulated pulses of light (especially for fiber-optic cables), or microwave (if using a radio / wireless networks).NICs that are in the receiver will process the signals obtained in the form of upside down, and convert these signals into a stream of bits (for a frame network) and change these bits into parallel data flow in the recipient's computer bus. Some functions can be directly owned by the NIC, installed in the firmware, or in the form of software installed in the operating system.Logical NICLogical NIC NIC is the type that does not exist physically and use the software fully installed on the operating system and work as if he is a NIC. Examples of logical NIC device is a loopback adapter (in the Windows operating system, must be installed manually or in the UNIX family of operating systems, installed by default, with the name of the lo interface) and Dial-up adapter (which makes the modem as a networking tool in the operating system Windows). Logical NIC card is made by using emulation techniques.