Nxx meaning in telecom là gì
1. NXX is most commonly used lớn refer lớn three-digit code that forms the second part of a 10-digit North American phone number (digits 4-6). This is also known as the "central office code" or "exchange".
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Traditionally, in the age of competing phone companies, each NXX is assigned lớn one company. Because four digits follow the NXX, that means available phone numbers were originally assigned lớn phone companies in blocks of 10,000. However, more recently, NANPA has been breaking up NXX blocks inlớn groups of 1,000 that can be assigned to different companies.See: NANPAWhile a phone company may "own" a bloông xã of 10,000 or 1,000 numbers, number portability allows customers lớn re-assign their individual number to lớn a different company.See: Number Portability2. "NXX" can also refer to the basic number format used for both NPA (area code) & NXX (exchange) numbers. N means 2-9, while X means 0-9. Therefore NXX simply means a three-digit number where the first digit can"t be "0" or "1".
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