Access Charge: Refers to two types of charges. The first is known as the carrier common line (CCL) charge or carrier's carrier charge. It is assessed by local-exchange carriers against toll carriers for interconnecting them with the local-exchange network. The second, the subscriber line charge (SLC), is paid by exchange customers for access to the local-exchange network to make interexchange calls.
Access Tandem: A switching system that provides traffic concentration and distribution functions for interLATA traffic.
ADSL (Asymmetric Digital Subscriber Line): A standard allowing digital broad- band (over 6 Mbps) signals and plain old telephone service to be transmitted up to 12,000 feet over a twisted copper pair.
AIN (Advanced Intelligent Network): Bellcore's switching concept that centralizes a significant amount of intelligence rather than constantly placing more and more information in the central office switch.
AOS (Alternative Operator Services): Name applied to those non-telephone company businesses that provide operator services (e.g., to private pay phone operators).
Asynchronous Transfer Mode: A transmission/switching scheme that is used for very high speed transmission. ATM appears to be the technology of choice for multimedia transmission.
Bell System: A term synonymous with the predivestiture American Telephone and Telegraph Company, which principally consisted of twenty-three local-exchange operating companies, Western Electric Company, Bell Laboratories, and Long Lines. Long Lines became the core of postdivestiture AT&T.
BOCs: Bell Operating Companies. The twenty-two operating companies divested from the Bell system under the MFJ. They provide intraexchange transport of calls and local access to interexchange service.
Bypass: The circumvention of a charge for a particular service by use of a lower-cost alternative. Potential for bypass exists when a service is priced substantially above cost or when a different technology is available at a lower cost. Toll and exchange bypass occurs by means of satellite, microwave, private line, and/or cable television facilities.
CAP (Competitive Access Provider): Alternative carrier (e.g., Teleport and Metropolitan Fiber Systems) that competes with telephone companies in carrying traffic. Usually these companies construct a fiber ring in an urban area to attract businesses to use their services in addition to or in place of the services of the local telephone company.
CEI: Comparably Efficient Interconnection. A postdivestiture service requirement imposed on the BOCs to assure that unaffiliated companies can attach to the network as efficiently as the BOCs.