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  2. Type Allocation Code - Wikipedia

    en.wikipedia.org/wiki/Type_Allocation_Code

    The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM , UMTS , LTE , 5G NR , iDEN , Iridium or other IMEI-employing wireless ...

  3. Symmetric multiprocessing - Wikipedia

    en.wikipedia.org/wiki/Symmetric_multiprocessing

    Diagram of a symmetric multiprocessing system. Symmetric multiprocessing or shared-memory multiprocessing [1] (SMP) involves a multiprocessor computer hardware and software architecture where two or more identical processors are connected to a single, shared main memory, have full access to all input and output devices, and are controlled by a single operating system instance that treats all ...

  4. List of telephone switches - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_switches

    Business Phone Business Phone Compact; Business Phone 50; Business Phone 128i; Business Phone 250; CP-400 (crossbar) CPP (Media Gateway) MD110; MX-ONE MX-ONE Telephony Switch (TSW) MX-ONE Telephony Server (TS) Rurax

  5. Intelligent Network - Wikipedia

    en.wikipedia.org/wiki/Intelligent_Network

    The Intelligent Network (IN) is the standard network architecture specified in the ITU-T Q.1200 series recommendations. [1] It is intended for fixed as well as mobile telecom networks.

  6. Short Message Service technical realisation (GSM) - Wikipedia

    en.wikipedia.org/wiki/Short_Message_Service...

    When the SMSC determines it needs to attempt to deliver a Short Message to its destination, it will send the SMS-PP APDU containing the text message, the "B-Party" (destination phone number) and other details to the Gateway MSC (GMSC) logical component on the SMSC. [2]

  7. Network switching subsystem - Wikipedia

    en.wikipedia.org/wiki/Network_switching_subsystem

    The numbers (RAND, SRES, K c) form the triplet sent back to the MSC. When a particular IMSI requests access to the GSM core network, the MSC sends the RAND part of the triplet to the SIM. The SIM then feeds this number and the K i (which is burned onto the SIM) into the A3 algorithm as appropriate and an SRES is calculated and sent back to the ...

  8. Short Message service center - Wikipedia

    en.wikipedia.org/wiki/Short_message_service_center

    A Short Message Service Center (SMSC) is a network element in the mobile telephone network. Its purpose is to store, forward, convert and deliver Short Message Service (SMS) messages.

  9. Subsystem number - Wikipedia

    en.wikipedia.org/wiki/Subsystem_number

    In Global System for Mobile Communications (GSM) and Universal Mobile Telecommunications System (UMTS), subsystem numbers may be used between Public land mobile networks (PLMNs), in which case they are taken from the globally standardized range (1 - 31) or the part of the national network range (129 - 150) reserved for GSM/UMTS use between PLMNs.