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telephone set base to handset cord: By de facto standard, this is usually a 4P4C connector. handset cord to handset: The handset end of the straight-through handset cord also uses a 4P4C connector. Some of these may be absent: Wired telephones may not have a separate base and handset.
The first types of small modular telephone connectors were created by AT&T in the mid-1960s for the plug-in handset and line cords of the Trimline telephone. [1] Driven by demand for multiple sets in residences with various lengths of cords, the Bell System introduced customer-connectable part kits and telephones, sold through PhoneCenter stores in the early 1970s. [2]
Four-position, four-contact (4P4C) plug, used for connecting a telephone handset and base Six-position, six-contact (6P6C) jack , which could be wired as RJ11, RJ14, or RJ25335 A registered jack ( RJ ) is a standardized telecommunication network interface for connecting voice and data equipment to a computer service provided by a local exchange ...
A handset is a component of a telephone that a user holds to the ear and mouth to receive audio through the receiver and speak to the remote party using the built-in transmitter. In earlier telephones, the transmitter was mounted directly on the telephone itself, which was attached to a wall at a convenient height or placed on a desk or table.
One cord to connect telephone is eliminated, base-to-handset and base-to-jack cords reinstated; 1986 With the closing of the Western Electric Indianapolis Works, Trimline production is moved overseas to Singapore and China. Minor modifications included: Earpiece Volume Control; Chirp Ringer/ringer loudness switch moved to base of the phone
In 1974, when modular connectors were introduced, the 2500 telephone was fitted with modular connectors on handset and line cords, resulting in type designations suffixed with M, e.g., 2500DM. In addition to the basic single-line model, the model 2500-series included many related variations and special purpose models with additional features.
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