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  2. Lineman's handset - Wikipedia

    en.wikipedia.org/wiki/Lineman's_handset

    A typical lineman's handset integrates an earpiece, a mouthpiece, a dialing interface, and a set of test leads for connecting to the telephone circuit. Originally, lineman's handsets featured a rotary dial , but modern sets use some variant of the standard 12-button DTMF keypad and also employ an amplifier for speaker use.

  3. Ringback number - Wikipedia

    en.wikipedia.org/wiki/Ringback_number

    The test consists of calling a reverting calling telephone number (ringback number) or a vertical service code with a standard telephone. Upon answering the call, the exchange plays a unique signal tone as a signal for the installer to hangup the telephone. The exchange then places a reverting call to the originating line, causing the telephone ...

  4. Harvard sentences - Wikipedia

    en.wikipedia.org/wiki/Harvard_sentences

    The Harvard sentences, or Harvard lines, [1] is a collection of 720 sample phrases, divided into lists of 10, used for standardized testing of Voice over IP, cellular, and other telephone systems. They are phonetically balanced sentences that use specific phonemes at the same frequency they appear in English.

  5. Automatic number announcement circuit - Wikipedia

    en.wikipedia.org/wiki/Automatic_number...

    By connecting a test telephone set, a technician calls the local telephone number of the automatic number announcement service. This call is connected to equipment at the central office that uses automatic equipment to announce the telephone number of the line calling in. The main purpose of this system is to allow telephone company technicians ...

  6. Loop around - Wikipedia

    en.wikipedia.org/wiki/Loop_around

    A loop line or loop around is a telephone company test circuit. The circuit has two associated phone numbers. When one side of the loop is called (side A), the caller receives a test tone of approximately 1000 Hz (milliwatt test). When the second number (side B) is called, it produces dead silence, but the party on side A hears the milliwatt ...

  7. Western Electric hand telephone sets - Wikipedia

    en.wikipedia.org/wiki/Western_Electric_hand...

    A typical Western Electric hand telephone set of c. 1930. It consists of a handset mounting with the handset held in a cradle, and a subscriber set mounted against a wall or vertical surface in close proximity. Shown is a B1A hand telephone set, also known as the type 102B-3 hand telephone set.

  8. CDMA mobile test set - Wikipedia

    en.wikipedia.org/wiki/CDMA_mobile_test_set

    A CDMA Mobile Test Set is a call simulating device that is used to test CDMA cell phones. It provides a network-like environment forming a platform to test the cell phone. This reduces cost of manufacturing and testing the cell phone in a real environment. It can be used to test all major 2G, 2.5G, 3G and 3.5G wireless technologies. In a lab ...

  9. Push-button telephone - Wikipedia

    en.wikipedia.org/wiki/Push-button_telephone

    A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones.. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in ...

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