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Subscriber: In a public switched telecommunications network, the ultimate user, i.e., customer, of a communications service.

Note 1: Subscribers include individuals, activities, organizations, etc.

Note 2: Subscribers use end instruments, such as telephones, modems, facsimile machines, computers, and remote terminals, that are connected to a central office.

Note 3: Subscribers are usually subject to tariff.

Note 4: Subscribers do not include communications systems operating personnel except for their personal terminals.

Source: from Federal Standard 1037C