In encryption, the date and time when a key becomes obsolete. [After X9.17]

Abbreviation for optical carrier. The nomenclature for the line rate of the optical transmission signal. [T1.106-1988]

OpenCable Application Platform

Abbreviation for other common carrier.

For equipment, such as a circuit or a switch, the ratio of the actual time in use to the available time during a 1-hour period.
Note 1: Occupancy is usually expressed in percent.
Note 2: Occupancy may be plotted versus time of day. Synonym usage.

1. The width of a frequency band such that, below the lower and above the upper frequency limits, the mean powers emitted are each equal to a specified percentage B/2 of the total mean power of a given emission. Unless otherwise specified by the CCIR for the appropriate class of emission, the value of B/2 should be taken as
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A station in the maritime mobile service the emissions of which are used to initiate, modify or terminate functions of equipment directly associated with an oceanographic data station, including the station itself. [NTIA]

A station in the maritime mobile service located on a ship, buoy, or other sensor platform the emissions of which are used for transmission of oceanographic data. [NTIA]

Open Cable Home Network

An Operating Company Number (OCN) is a four place alphanumeric code that uniquely identifies providers of local telecommunications service. OCN assignments are required of all SPs in their submission of utilization and forecast data (FCC 00-104, ¶ 41 and Public Notice DA 00-1549). Relative to CO Code assignments, NECA assigned Company Codes may be used as OCNs.