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  1. Há 3 dias · Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of channels numbered at 5 MHz spacing (except in the 45/60 GHz band, where they are 0.54/1.08/2.16 GHz apart) between the centre frequency of the channel.

  2. Há 4 dias · Area Code Boundaries represent the geographic telephone area codes, also known as Numbering Plan Areas (NPAs), for the North American Numbering Plan (NANP) area which includes the following countries: United States and its territories and possessions, Canada, Bermuda, Anguilla, Antigua & Barbuda, the Bahamas, Barbados, the British ...

  3. Há 3 dias · The Constitution of the United States is the supreme law of the United States. [3] It superseded the Articles of Confederation, the nation's first constitution, on March 4, 1789. Originally including seven articles, the Constitution delineates the national frame and constrains the powers of the federal government.

  4. Há 2 dias · The first documented use of the phrase "United States of America" is a letter from January 2, 1776. Stephen Moylan, a Continental Army aide to General George Washington, wrote to Joseph Reed, Washington's aide-de-camp, seeking to go "with full and ample powers from the United States of America to Spain" to seek assistance in the Revolutionary War effort.

  5. Há 1 dia · this country is in the North American Numbering Plan (calling it works like a Canadian long distance call)...however, international charges may apply when calling US numbers! Calling the United States from other countries:

  6. Há 4 dias · 268 7xx. 10. NANP member. Argentina. +54. 9/15. 10. All carriers: Claro, Movistar, Personal, Tuenti. 15 before the local number but after long distance area code for national calls (0 11 15 xxxx-xxxx) and 9 placed after the international access code excluding the 15 for international calls (+54 9 11 xxxx-xxxx).

  7. Há 3 dias · The United States is a country in North America that is a federal republic of 50 states. Besides the 48 conterminous states that occupy the middle latitudes of the continent, the United States includes the state of Alaska, at the northwestern extreme of North America, and the island state of Hawaii, in the mid-Pacific Ocean.