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telephone line to phone cord: The wall jack. This connection is the most standardized, and often regulated as the boundary between an individual's telephone and the telephone network. In many residences, though, the boundary between utility-owned and household-owned cabling is a network interface on an outside wall known as the demarcation ...
PBX switchboard, 1975. A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections.
A party line (multiparty line, shared service line, party wire) is a local loop telephone circuit that is shared by multiple telephone service subscribers. [ 1 ] [ 2 ] [ 3 ] Party line systems were widely used to provide telephone service, starting with the first commercial switchboards in 1878. [ 4 ]
The length of the line to a customer telephone interface presents a resistance across which the central office supply is reduced and therefore the potential at customer sites varies. The nominal battery ( system ) voltage is 52.1 V, based on a 24-cell lead-acid battery. [ 1 ]
PSTN network topology is the switching network topology of a telephone network connected to the public switched telephone network (PSTN).. In the United States and Canada, the Bell System network topology was the switching system hierarchy implemented and operated from c. 1930 to the 1980s for the purpose of integrating the diverse array of local telephone companies and telephone numbering ...
Southwestern Bell Texas then converted itself into a limited partnership and renamed itself Southwestern Bell Telephone, L.P., incorporated in Texas. [6] This company ceased to exist on June 29, 2007, when it was merged into SWBT Inc. , incorporated in Missouri, [ 7 ] which was founded just 8 days prior.
The twelve channel scheme was first devised in the early 1930s to provide a line spectrum covering 60 to 108 kHz for the Type J Carrier Telephone System, an equivalent four wire (on two wire facilities) open wire carrier that was used almost exclusively for interstate long haul toll telephony.
Fixed telephone lines per 100 inhabitants, 1997–2007. Cross section of telephone cable of 1,800 twisted pairs, 1922. A newer telephone cable used to carry telephone lines from several customers. A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. [1]