NSAP address

A Network Service Access Point ( NSAP ) is according to ITU- T X.115 (1995 ), the information needed by a provider of an OSI Network Service to identify a specific service access point. Usually so that a computer or computer program, or in general, a terminal address, wherein the address is an NSAP constructed following specific rules.

The NSAP address (also called ATM address ) has a variably adjustable length up to 20 bytes, which corresponds to 40 decimal digits. Bytes 1-13 constitute the network portion and the bytes 14-20 the user part.

There are currently three different address formats:

  • DCC: Data Country Code
  • ICD: International Code Designator
  • E.164 ISDN number

A terminal may have several NSAPs.

NSAP addresses are generally in the regime of the ISO, the delegates the allocation of national standardization organizations. One of the scheme, according to which NSAPs be formed, the numbering scheme according to ITU E.164, which regulates the formation of international phone numbers.

  • Communication technology
International Telecommunication Union
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