Network and switching subsystem (NSS).

Network and switching subsystem (NSS).
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1 Answer

Answer :

The NSS comprises MSC, HLR and VLR.
Mobile services switching center (MSC): These are high performance digital switches. An MSC  manages several BSCs and provide connections to other MSCs and to the BSCs via the A  interface. Home location register (HLR): It contains all the user related data such as the mobile  subscriber ISDN number (MSISDN), subscribed services (e.g., call forwarding, roaming  restrictions, GPRS), and the international mobile subscriber identity (IMSI).
Visitor location register (VLR): It is a dynamic database which stores all important data needed  for the Mobile Station users currently in the (location area) LA that is associated to the Mobile  Switching Center.
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