A computer system that is a part of, or is embedded in, a larger entity, such as a communications system, and that interacts in real or near-real time with the entity and its users.

A process in which images or listings of goods and services are viewed remotely via electronic means, e.g., a vendor's Web site, items are selected for purchase, and the transaction is completed electronically with a credit card or an established credit account.
Note: Various encryption schemes may be, and usually are, used to reduce the risks of sending sensitive information,… (Read More →)

In computer networking, a software modification or installation performed remotely from an originating site (e.g., by authority of a network administrator) on a subject user's computer, by means of a special utility program that enables access to the subject computer whenever it is powered up and on line.
Note: An online software upgrade may be performed (a) automatically, without the… (Read More →)

Old Network Service Provider

Optical Network Terminal

Optical Network Unit

Out of Band

A mechanism by which a program can manipulate data structures of any format, without knowing what that format might be [POSIX.6].

1. In communications, a circuit available for use.
2. In electrical engineering, a circuit that contains an essentially infinite impedance.
Note: An open circuit may be intentional, as in a switch, or may constitute a fault, as in a severed cable.

The term "Open Circuit Test Line" denotes an arrangement in an end office which provides an ac open circuit termination of a trunk or line by means of an inductor of several Henries.