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A "T3" in computer networking refers to a high-speed digital data line with a bandwidth of approximately \(44.736\) Mbps, also known as a DS3 line. These dedicated lines, often used by large organizations for connecting networks and the internet, offer reliable, high-speed connections capable of carrying large amounts of data and real-time video. While still used for specific applications like redundancy, T3 lines are largely being replaced by modern broadband and fiber connections due to cost and availability. 

Key characteristics of a T3 line 

Speed: Transmits data at \(44.736\) megabits per second, which is equivalent to about 672 standard voice-grade phone lines.

Dedicated: The connection is a direct, point-to-point line, meaning it is not shared with other users, providing more security and guaranteed bandwidth.

Synchronous: Data upload and download speeds are equal.

Cost: T3 lines are a premium service and are generally more expensive than modern broadband alternatives, though the cost is fixed and predictable.

Applications: Used for high-bandwidth needs like linking large corporate networks, connecting to the internet's backbone, and in sectors like healthcare for sharing medical data or broadcasting for high-definition video.

Other meanings of T3

WebLogic Protocol: T3 is also a proprietary protocol used by Oracle WebLogic Server to enable communication between Java Virtual Machines, as described in Stack Overflow.

Product/System Name: "T3" can be part of a product name, such as the "Advisor T3" USB protocol analyzer system, as seen in this Teledyne LeCroy product page.

Operating System: "T3" can also refer to a specific operating system, like the one developed by EquipmentShare for the construction industry, as mentioned in this EquipmentShare blog post.