A foreign object present within, for example, an optical fiber or a crystal.

In optics, characterized by a degree of coherence significantly less than
0. 88.

The ability of a user to terminate data calls via an ISDN. [T1.615-1992]

A switching system feature that allows an attendant to identify visually the type of service or trunk group associated with a call directed to the attendant's position.

An implementation-defined relation between the values of MAC labels or Information Labels. Two labels are incomparable if neither label dominates the other, that is the two labels are disjoint [POSIX.6].

A block successfully delivered to the intended destination user, but having one or more incorrect bits, additions, or deletions, in the delivered block.

Data compaction accomplished by specifying only the initial value and all subsequent changes.
Note: An example of incremental compaction is the storing or transmitting of a line voltage followed only by the deviations from the initial value. Thus, instead of transmitting the values 102, 104, 105, 103, 100, 104 and 106, only the values 102, +2, +1, -2, -3, +4,… (Read More →)

In spread-spectrum systems, phase modulation in which one binary code sequence is shifted with respect to another, usually to conduct a synchronizing search, i.e., a search to discover if the two sequences are the same, and perhaps thereby enabling two data streams to be synchronized. [From Weik '89]

1. A call sign that represents a group of facilities, commands, authorities, activities, or units rather than one of these.
2. In radio communications, a call sign that does not identify a station and that is used in the call-up signal or in a message that has the station call sign encrypted in the text. [From Weik '89]

In communication network timing subsystems, free-running precision clocks used, for synchronization purposes, at the nodes.
Note: Variable storage buffers, installed to accommodate variations in transmission delay between nodes, are made large enough to accommodate small time (phase) departures among the nodal clocks that control transmission. Traffic may occasionally be interrupted to allow the buffers to be emptied of some or… (Read More →)