Glossary:

ATIS Telecom Glossary

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subroutine

A set of computer instructions (or pieces of code) that run within a program (or are called within a program) to carry out a predefined function or computation.
Note: "Open" subroutines are integrated into the main program. "Closed" subroutines are arranged so that program control is shifted to them for execution of their task(s) and then returned to the main… (Read More →)

subscribe

In computer conferencing, to add one's address to a distribution list, or to join a forum. [2382-pt.35]

subscriber

1. 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… (Read More →)

subscriber key

A key encrypting key or data key transported in a multiple center CSM for eventual distribution to a pair of subscribers. [After X9.28]

subscriber line

1. Synonym loop.
2. A communication channel between a telephone station, PBX or TWX station and the central office which serves it. Synonym exchange line. [47 CFR Pt.36-A]

Subscriber Profile Database

A subset of the carrier master database that is representative for a given user containing information related to the user, the user’s domain and the user’s subscriptions to services.

Subscription

A mapping of a set of IPTV services to Devices and Users within a given consumer domain.

substitute character (SUB)

A control character that is used in the place of a character that is recognized to be invalid or in error or that cannot be represented on a given device.

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