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Note: if on-hook pertains to one state, off-hook pertains to the other. The idle state, i.e., an open loop of a subscriber line or PBX user loop. An operating state of a telecommunication circuit in which transmission is disabled and a high impedance, or "open circuit", is presented to the link by the end instrument(s).
Number 4 Electronic Switching System (Alcatel-Lucent) 4WTS: Four-wire termination set: US 5ESS Number 5 Electronic Switching System (Alcatel-Lucent) ACD: Automatic Call Distribution/Director ACTS: Advanced Coin Telephone Service: US ADSL: Asymmetric Digital Subscriber Line ANI: Automatic Number Identification: US AMA: Automatic Message ...
An automatic number announcement circuit (ANAC) is a component of a central office of a telephone company that provides a service to installation and service technicians to determine the telephone number of a telephone line. The facility has a telephone number that may be called to listen to an automatic announcement that includes the caller's ...
After World War II, the newly conceived nationwide numbering plan of 1947 sought to unify all local numbering plans by using a system of two central office letters and one digit to complete the office prefix, and four digits for line number. This system was referred to as 2L-5N, or simply 2-5. This plan was projected to be usable beyond the ...
The Bell System dial service implemented a feature called automatic number identification (ANI) which facilitated services like automated billing, toll-free 800-numbers, and 9-1-1 service. In manual service, the operator knows where a call is originating by the light on the switchboard jack field.
In rural areas with magneto crank telephones connected to party lines, the local phone number consisted of the line number plus the ringing pattern of the subscriber. To dial a number such as "3R122" meant making a request to the operator the third party line (if making a call off your own local one), followed by turning the telephone's crank ...
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In 2022, 82.9% of German households had at least one landline phone [18] while 73 percent of U.S. households had only a cell phone, 25 percent had a landline and cell service, and 1 percent had only a landline. [19] As of 2023, Estonia and the Netherlands have retired the legacy parts of the public switched telephone network (PSTN). In the ...