Network Service Access Point (NSAP) addresses, defined in ISO/IEC 8348, are identifying labels for network endpoints used in OSI networking. These are roughly comparable to IP addresses used in the IP protocol; they can specify a piece of equipment connected to the ATM network. A specific stream is specified by using a TSAP, or Transport Service Access Point.

PropertyValue
dbpprop:abstract
  • Network Service Access Point (NSAP) addresses, defined in ISO/IEC 8348, are identifying labels for network endpoints used in OSI networking. These are roughly comparable to IP addresses used in the IP protocol; they can specify a piece of equipment connected to the ATM network. A specific stream is specified by using a TSAP, or Transport Service Access Point. ATM can also use a Presentation and Session AP (PSAP and SSAP respectively), but these may also be left blank; this is up to the application. NSAP addresses are allocated by the ISO, through a system of delegated authorities, which are generally national standards organizations. One of the schemes to generate NSAPs uses E.164 which is the addressing format describing phone numbers. NSAP addresses do not specify where a network terminal is located. Routing equipment must translate NSAP addresses to SNPAs (SubNetwork Point of Attachment) to route OSI packets; VCI (Virtual Circuit Identifier) numbers are an example of a datalink layer SNPAs in ATM; when OSI packets are sent encapsulated in IP packets the IP address is considered an SNPA. Currently SDH/SONET networks are a major part of the network infrastructure and NSAPs are used extensively. They are usually assigned by the Network Management/NOC personnel and agreed upon within an organisation to be unique (to that organisation and based on geographical location using country code phone prefixes) and are required before any operational connectivity is established at the commissioning stage. NSAP addresses are used in the following OSI-based network technologies: ATM switched virtual circuit networks X.25 (see ITU-T X.121 for addressing in public data networks) Frame relay IS-IS SDH & SONET networks. NSAP-style addresses are used in the IS-IS routing protocol.
  • Ein Network Service Access Point (NSAP) ist nach ITU-T X.115 (1995) die Information, die ein Provider eines OSI Network Service benötigt, um einen bestimmten Dienstzugangspunkt zu identifizieren. Gewöhnlich wird damit ein Computer bzw. Computerprogramm oder generell ein Endgerät adressiert, wobei der NSAP eine Adresse darstellt, die nach bestimmten Regeln aufgebaut ist. Die NSAP Adresse (auch ATM-Adresse genannt) hat eine variabel einstellbare Länge bis maximal 20 Byte, welches 40 Dezimalziffern entspricht. Die Bytes 1–13 bilden den Netzwerkanteil und die Bytes 14–20 den Userteil. Derzeit existieren drei verschiedene Adressformate: DCC: Data Country Code ICD: International Code Designator E.164: ISDN Nummer Ein Endgerät kann mehrere NSAPs haben. NSAP-Adressen liegen generell im Regime der ISO, die die Vergabe an nationale Standardisierungsorganisationen delegiert. Eines der Schemas, nach denen NSAPs gebildet werden, ist das Nummernschema nach ITU E.164, das die Bildung internationaler Telefonnummern regelt.
dbpprop:hasPhotoCollection
rdf:type
rdfs:comment
  • Network Service Access Point (NSAP) addresses, defined in ISO/IEC 8348, are identifying labels for network endpoints used in OSI networking. These are roughly comparable to IP addresses used in the IP protocol; they can specify a piece of equipment connected to the ATM network. A specific stream is specified by using a TSAP, or Transport Service Access Point.
  • Ein Network Service Access Point (NSAP) ist nach ITU-T X.115 (1995) die Information, die ein Provider eines OSI Network Service benötigt, um einen bestimmten Dienstzugangspunkt zu identifizieren. Gewöhnlich wird damit ein Computer bzw. Computerprogramm oder generell ein Endgerät adressiert, wobei der NSAP eine Adresse darstellt, die nach bestimmten Regeln aufgebaut ist.
rdfs:label
  • NSAP address
  • Network Service Access Point
owl:sameAs
skos:subject
foaf:page
is dbpprop:redirect of
is owl:sameAs of