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The T-carrier is a hardware specification for carrying multiple time-division multiplexed (TDM) telecommunications channels over a single four-wire transmission circuit. It was developed by AT&T at Bell Laboratories ca. 1957 and first employed by 1962 for long-haul pulse-code modulation (PCM) digital voice transmission with the D1 channel bank.
Not assignable; N11 code for repair service for land-line telephones, customer service for wireless carriers 612: Minnesota (Minneapolis, Fort Snelling, St. Anthony, and Richfield) 1947: 1954: split to create 507; 1996: split to create 320; 1998: split to create 651; 2000: split to create 763 and 952; 613: Ontario (Ottawa metropolitan area and ...
Area code 705 was created in a 1956 area code split from portions of the 613 and 519 numbering plan areas. After a reduction in geographic coverage in 1962, the numbering plan area was assigned a second area code, 249, in 2011 to form an overlay numbering plan. A third area code, 683, was added in June 2022.
Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, or 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.
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]
C = Service Code Modifier: 2 alphabetic characters. Required. Modifies meaning of the service code, often identifies different billing options. D = NPA: 3 digits. This is a required field. Numbering plan area code. E = NXX: 3 digits. This is a required field. Central office (exchange) code. F = Line: 4 digits. This is a required field.
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