Uses of Internet Service Providers The Internet Service Provider, with acronym ISP, refers to an organization which supplies services for accessing and using the internet. Examples of organizations that can be ISPs are commercial entities, community-based organizations, non-profit organizations, and privately-owned enterprise. An ISP can offer these forms of services – 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. Well-known communications companies are also ISPs, and, at the same time, a part or interlinked with a bigger network company which is also into internet service. There are many 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. Furthermore, for small businesses, the access providers may also provide the following services – dial-up, DSL,asymmetric digital subscriber line,cable modem or Integrated Services Digital Network. For medium-to-large businesses, which have more demanding requirements, access providers may further offer these technologies – 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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Mailbox providers are organizations that provide services for hosting electronic mail with the right to use storage for mail boxes. A mailbox provider can also be an access provider, if it also offers similar services of access providers. 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. The kind of business service provided by a transit ISP is interlinking first to an upstream ISP so that it can access internet to their customers. By purchasing the services of another ISP, the virtual ISP provides their customers access to the infrastructure and services of another ISP. 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 network operating wireless ISPs is based on wireless technology. Such technologies that may be referred to are the following: 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.

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