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In the United States a longer duty cycle is used, 50% for battery -powered buoys (20 seconds on, 20 seconds off) and 75% for on-shore beacons. Ramarks are wide-band beacons which transmit continuously on the radar bands without having to be triggered by an incoming radar signal.
The sortable table below contains the three sets of ISO 3166-1 country codes for each of its 249 countries, links to the ISO 3166-2 country subdivision codes, and the Internet country code top-level domains (ccTLD) which are based on the ISO 3166-1 alpha-2 standard with the few exceptions noted.
Delay code properties cover nine category sets for delay. Each category set can be described using either a two-digit number code or a two letter alpha code; most airlines use the numeric format, but some prefer the alpha.
Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy.
This list is based on the official standard, but includes defunct codes and historical changes, including the derivation of the two letter identities, in cases where known.
ISO 3166-1 (Codes for the representation of names of countries and their subdivisions – Part 1: Country codes) is a standard defining codes for the names of countries, dependent territories, and special areas of geographical interest.
Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits. A numbering plan area with multiple area codes is called an overlay .
A. Abbreviated dialing. All-number calling. Area code split. Area codes in the Caribbean. Arogyavani. Automatic number announcement circuit.
This article contains a list of area codes in Brazil for telephone dialing. The area codes are distributed geographically, citing the main cities in each area. Local phone numbers in Brazil observe an eight-digit pattern ( nnnn-nnnn) for landlines and nine digits ( nnnnn-nnnn) for mobile phones.