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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.
TDS Telecom is a subsidiary of Telephone and Data Systems Inc, and offers telephone, broadband Internet and television services in 30 states. It also sells businesses communications services, and participates in the FCC's Connect America Fund to bring high speed internet to rural areas.
A telecommunications device for the deaf (TDD) is a teleprinter, an electronic device for text communication over a telephone line, that is designed for use by persons with hearing or speech difficulties. Learn about the history, features, and types of TDDs, also known as teletypewriters, textphones, or minicoms.
List of the mainly electro mechanical switching systems from Hasler AG Bern, which were used in public telephone network in Switzerland for many decades. Hasler AG finally merged into Ascom in 1987. HS 25 (modified from the Ericsson OL-100 system with double relays and 25-point selector (Ericsson license), mainly used for small villages and ...
Secure Terminal Equipment (STE) is the U.S. government's encrypted telephone communications system for wired or "landline" communications. STE sets are compatible with STU-III phones and can use ISDN, PSTN, SCIP, TRI-TAC, DRSN and VoIP networks.
The most commonly used telephone sets for the 1A2 systems were modifications of the Bell System standard 500-series telephones for rotary dial systems, and the 2500-series Touch-Tone desk sets. For key system operation these sets were equipped with a set of push-buttons ( keys ) and additional internal contact springs to control the additional ...
Learn about the history and functions of telephone switchboards, devices that connect telephone circuits and operators. Find out how switchboards evolved from manual to automatic and electronic systems.
A business telephone system is a telephone system used in business environments, encompassing the range of technology from the key telephone system (KTS) to the private branch exchange (PBX). A PBX is a telephone exchange or switching system that serves a private organization, and differs from a KTS in that it requires an operator or attendant at a switchboard to establish connections.