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Definition of "Tandem Central Office" |
A telephone office that makes connections between local offices in an area where there is such a high density of local offices that it would be uneconomical to make direct connections between them. Also known as tandem office. / North american exchange number plan is most commonly used to refer to three-digit code that forms the second part of a 10-digit North American phone number. This is also known as the central office code or exchange. |
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