ISP or Internet Service Provider is a business organization which provides access to the use of the internet. Examples of organizations that can be ISPs are commercial entities, community-based organizations, non-profit organizations, and privately-owned enterprise. Typical internet services which an ISP can provide are the following: internet access, internet transit, domain name registration, web hosting, Usenet service, and collocation.
Because of the interlinking of networks in the internet world, any ISP can link to a large network and become a part of their network. In your region, whichever is a large, conglomerate communications network could also be an ISP, and, at the same time, a part of a bigger network which is into internet accessing and which could originate from another country.
The following are classifications of internet service provider (ISP): access providers, mailbox providers, hosting ISPs, transit ISPs, virtual ISPs, free ISPs, and wireless ISP.
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Access providers supply internet access via the following technology: computer modems with acoustic couplers, telephone lines, television cable (CATV), wi-fi, and fiber optics. For small businesses, access providers may also service the following: dial-up, DSL,asymmetric digital subscriber line,cable modem or Integrated Services Digital Network. Other forms of technologies may be provided by access providers to medium-to-large businesses, such as higher-speed DSL, Ethernet, metropolitan Ethernet, gigabit Ethernet, Frame Relay, ISDN Primary Rate Interface, ATM (Asynchronous Transfer Mode) and SONET (synchronous optical networking).
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An organization which provides services for hosting electronic mail domains with access to storage for mail boxes is called a mailbox provider. Mailbox providers may also become access providers, depending on the other technology services that they provide. Basically, mail providers offer email services, which employ the sending, receiving, accepting, and storing of emails for the users.
Hosting ISPs provide these services – email, web-hosting, online storage services, as well as a virtual server, cloud services, physical server operation.
It is called transit ISP because this type of provider has to pay an upstream ISP in order to access internet to their customers.
Virtual ISP functions more as facilitators as it operates by availing of the services of another ISP, which mainly acts as a service wholesaler, and, thereby, allowing access of the customers of the virtual ISP to their services and infrastructures. Virtual ISP services resemble that of virtual network operators or competitive local exchange carriers.
Free of charge services are provided by free ISPs, but they profit from advertisement displays while the users are connected and are using the free service. Basically, free ISPs are non-profit organizations with volunteer staffs.
The kind of network of wireless ISPs is based on wireless technology. Technologies in the form of commonplace Wi-Fi wireless mesh networking, or proprietary equipment designed to operate over open 900 MHz, 2.4 GHz, 4.9, 5.2, 5.4, 5.7, and 5.8 GHz bands or licensed frequencies such as 2.5 GHz (EBS/BRS), 3.65 GHz (NN) and in the UHF band (including the MMDS frequency band) and LMDS, may be utilized by wireless ISPs.