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TAC Transmit Access Control

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Each mobile device that operates on a cellular network is assigned a TAC, which is a part of its International Mobile Equipment Identity (IMEI) number. The IMEI is a globally unique identifier for mobile devices. The TAC specifically represents the initial eight digits of the IMEI, and it provides important information about the device's origin and characteristics.

Here are some key details about the Type Allocation Code (TAC):

  1. Structure: The TAC is a 8-digit code that is embedded within the IMEI. The TAC is globally unique and is assigned by the GSM Association (GSMA), which is the industry body that represents mobile network operators and device manufacturers worldwide.
  2. Manufacturer Identification: The first two digits of the TAC represent the Reporting Body Identifier (RBI), which identifies the entity responsible for allocating TACs. The RBI is assigned by the GSMA to device manufacturers or regional organizations authorized to issue TACs.
  3. Device Model Identification: The next six digits of the TAC represent the individual device model. Manufacturers assign these digits based on their internal identification system. The combination of the RBI and model digits uniquely identifies a specific device model within the cellular network.
  4. Regulatory Compliance: The TAC is used by regulatory bodies and network operators to ensure compliance with regional regulations and compatibility standards. It helps in identifying devices that are approved for use within specific countries or regions and ensures that they meet technical requirements.
  5. Device Management: The TAC is used by mobile network operators and device management systems to track and manage devices within their networks. It assists in inventory management, device provisioning, network optimization, and security measures like device blacklisting or whitelisting.
  6. IMEI Database: The GSMA maintains a global IMEI database that contains information about mobile devices and their associated TACs. This database is used by network operators, law enforcement agencies, and regulatory authorities to track and identify stolen or unauthorized devices, as well as for network planning purposes.
  7. Device Identification and Authentication: The TAC, along with the remaining digits of the IMEI, serves as a unique identifier for mobile devices. It is used for device authentication and verification during network registration processes and for identifying devices when troubleshooting network issues or providing customer support.

In summary, the Type Allocation Code (TAC) is an 8-digit identifier that is assigned to mobile devices within a cellular network. It represents the manufacturer and model of the device and is part of the International Mobile Equipment Identity (IMEI) number. The TAC is used for regulatory compliance, device management, network planning, and device identification purposes within the telecommunications industry.