three-channel hf-telephone system
11Clear Channel Communications — Not to be confused with clear channel radio stations, a type of AM radio station. This article is about the broadcasting company. For other uses, see Clear channel. CC Media Holdings, Inc. Type Private Industry …
12Headset (telephone/computer) — A headset is a headphone combined with a microphone. Used in call centers and by people in telephone intensive jobs, headsets provide the equivalent functionality of a telephone handset with hands free operation. Many people use headsets at the… …
13Cordless telephone — A cordless telephone with base. A cordless telephone or portable telephone is a telephone with a wireless handset that communicates via radio waves with a base station connected to a fixed telephone line, usually within a limited range of its… …
14Quiz channel — A quiz channel (also known as a participation television channel) is a television channel that focuses on phone in quizzes. The quizzes usually focus on puzzles such as fill in the blanks, name the celebrity and add up the numbers. The quiz… …
15Signalling System No. 7 — SS7 protocol suite OSI layer SS7 protocols Application INAP, MAP, IS 41... TCAP, CAP, ISUP, ... Network MTP Level 3 + SCCP Data link MTP Level 2 …
16Advanced Mobile Phone System — Motorola DynaTAC 8000X AMPS mobile phone Advanced Mobile Phone System (AMPS) was an analog mobile phone system standard developed by Bell Labs, and officially introduced in the Americas in 1983,[1] …
17Mutual Broadcasting System — Type Cooperative radio network (1934–52); corporate controlled radio network (1952–99) …
18Clear-channel station — This article is about class A/class I protected AM stations. For stations owned by the company named Clear Channel, see Clear Channel Communications. A clear channel station is an AM band Radio station in North America that has the highest… …
19Number Five Crossbar Switching System — The Number Five Crossbar Switching System or 5XB switch, designed by Bell Labs and made by Western Electric, was in use in Bell System telephone exchanges from 1948 to the 1980s. Its principal use was as a Class 5 telephone switch, though… …
20Decca Navigator System — D …
