Regional Bell operating company (RBOC) is a term describing one of the U.S. regional telephone companies (or their successors) that were created as a result of the breakup of American Telephone and Telegraph Company (AT&T, known also as the Bell System or “Ma Bell”) by a U.S. Federal Court consent decree on December 31, 1983.
The seven original regional Bell operating companies were Ameritech, Bell Atlantic, BellSouth, NYNEX, Pacific Bell, Southwestern Bell, and US WEST. Each of these companies owned at least two Bell operating companies (Bell operating company). The BOCs were given the right to provide local phone service while AT&T was allowed to retain its long-distance service. The RBOCs and their constituent BOCs are part of the class of local exchange carriers (LECs). (Rhine, Robert S. March 2008)
ILEC:An ILEC (incumbent local exchange carrier) is a telephone company in the U.S. that was providing local service when the Telecommunications Act of 1996 was enacted. ILECs include the former Bell operating companies (BOCs) which were grouped into holding companies known collectively as the regional Bell operating companies (RBOCs) when the Bell System was broken up by a 1983 consent decree. ILECs are in contradistinction to CLEC (competitive local exchange carriers). (Rouse, Margaret March 2008) CLEC:
In the United States, a CLEC (competitive local exchange carrier) is a telephone company that competes with the already established local telephone business by providing its own network and switching. The term distinguishes new or potential competitors from established local exchange carriers (LECs) and arises from the Telecommunications Act of 1996, which was intended to promote competition among both long-distance and local phone service providers. (Rouse, Margaret March 2008) MSO:
A multiple-system operator or multi-system operator (MSO) is an operator of multiple cable or direct-broadcast satellite television systems. A cable system in the United States, by Federal Communications Commission (FCC)definition, is a facility serving a single community or a distinct governmental entity, each with its own franchise agreement with the cable company.
Though in the strictest sense any cable company that serves multiple communities is thus an MSO, the term today is usually reserved for companies that own a large number of cable systems, such as Time Warner Cable, Cablevision, Comcast, Charter Communications and Cox Communications in the United States, Rogers Communications, Videotron and Shaw Communications in Canada or Virgin Media in the UK. (Wikipedia) ISP:
Short for Internet Service Provider, it refers to a company that provides Internet services, including personal and business access to the Internet. For a monthly fee, the service provider usually provides a software package, username, password and access phone number. Equipped with a modem, you can then log on to the Internet and browse the World Wide Web and USENET, and send and receive e-mail.
For broadband access you typically receive the broadband modem hardware or pay a monthly fee for this equipment that is added to your ISP account billing. In addition to serving individuals, ISPs also serve large companies, providing a direct connection from the company’s networks to the Internet. ISPs themselves are connected to one another through Network Access Points (NAPs). ISPs may also be called IAPs (Internet Access Providers).
References:http://searchunifiedcommunications.techtarget.com/definition/regional-Bell-operating-company http://searchunifiedcommunications.techtarget.com/definition/ILEC http://searchunifiedcommunications.techtarget.com/definition/CLEC http://en.wikipedia.org/wiki/Multiple-system_operator