The mandatory one-octet field that uniquely defines the function and format of each ISDN user-part message. [T1.110-1987]

1. A unit of measure for charging telephone calls, based on parameters such as the length of the call, the distance called, and/or the time of day.
2. Unit of measurement used for charging for measured message telephone exchange traffic within a specified area. [47 CFR Pt.36-A]

The smallest unit of data in the message body. This normally contains the actual feature data that a subscriber at the customer installation (CI) is supposed to receive, according to the feature service description. [T1.401-1998]

In integrated services digital networks (ISDN), an interactive telecommunications service that provides for information interchange among users by means of store-and-forward, electronic mail, or message-handling functions. Synonym [loosely] electronic messaging service.

Of or relating to that portion of an HTML document that is not viewable by users through normal use of the browser window, but is readable by search engines and used to facilitate indexing. [After Bahorsky]

A certificate, issued to a signatory authority, that displays all co-signature requirements for its signatory certificates. [After X9.45]

A meta key word that is incorporated in the head of an HTML document, and that includes the document's name and facilitates indexing for search engines. [After Bahorsky]

The standardized vacant codes that convey meta-signaling information across a user-network interface (UNI). [T1.627-1993]

A circuit in which metallic conductors are used and in which the ground or earth forms no part.

A noncommunications metallic cable component such as a shield, vapor barrier, or strength member. [T1.316-1997]