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Telephone and Data Systems, Inc. is a Chicago-based telecommunications service company providing wireless products and services; cable and wireline broadband, TV and voice services; and hosted and managed services to approximately 6 million customers nationwide through its business units TDS Telecom and U.S. Cellular (NYSE: USM) and OneNeck IT Solutions.

Birch, Zentality Communications, Smithville Fiber, Sage Telecom, Comcast, Cincinnati Bell, CloseCall America, Frontier Communications, Windstream, TDS Telecom, Matrix, Charter Communications, Comtech21, Mulberry Communications, Perry-Spencer Communications, Clay County Rural Telephone d/b/a Endeavor Communications, Enhanced Telecommunications d ...

A German copper phone line termination box called Abschlusspunkt LinienTechnik (APL, " Demarcation point ") In telecommunications, a network interface device ( NID; also known by several other names) is a device that serves as the demarcation point between the carrier's local loop and the customer's premises wiring.

The Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP (3rd Generation Partnership Project), UMTS is a component of the International Telecommunications Union IMT-2000 standard set and compares with the CDMA2000 standard set for networks based on the competing cdmaOne ...