The portion of a transmission facility, including terminating points, between (a) a terminal network element (NE) and a regenerator (for example, a central office/remote terminal and customer location equipment such as a DTE) or (b) two regenerators. A terminating point is the point after signal regeneration at which performance monitoring is or may be done. [After T1.105-1988]

The boundary that separates a network section from the adjacent circuit section, or separates an access circuit section from the adjacent DTE (data terminal equipment). Synonym boundary.

(J0), a single byte or a sequence of bytes, used to transmit a unique message so that the receiving terminal in a section can verify it is connected to the intended transmitter.

A predetermined, addressable angular part of a track or band on a magnetic drum or magnetic disk.

A copy-protection technique for copy protection that determines whether a diskette is an unauthorized copy by checking whether sectors are positioned properly from track to track. [2382-pt.8]

In magnetic or optical disk storage media, the division of tracks into a specified number of segments, for the purpose of organizing the data stored thereon.

Telecommunications deriving security through use of type 1 products and/or protected distribution systems. [INFOSEC-99]

[The] specification for a secure hash algorithm that can generate a condensed message representation called a message digest. [INFOSEC-99]

Resident software controlling hardware and other software functions in an information system (IS) to provide a level of protection or security appropriate to the classification, sensitivity, and/or criticality of the data and resources it manages. [INFOSEC-99]

[The] condition in which no subject can access any object in an unauthorized manner. [INFOSEC-99]