What type of data link is described as jam-resistant and supports both active and passive participants?

The Joint Tactical Information Distribution System (JTIDS) is designed for secure and reliable communication among military assets, making it jam-resistant, which is essential in combat environments where electronic warfare is prevalent. JTIDS utilizes a spread-spectrum frequency-hopping technique that makes it difficult for adversaries to jam or intercept the data being transmitted.

Moreover, it supports both active and passive participants, enabling a broader range of military units to communicate effectively. Active participants can send and receive data, while passive participants can receive information without the capability to transmit, which is useful for maintaining situational awareness without exposing themselves to threats.

In the context of the other types of data links listed, while Tactical Chat, Tactical Data Link, and Video Data Link have their specific uses in communication, they do not share the same level of jam resistance or the capability to support both active and passive roles in the way that JTIDS does. This distinction underscores the unique features of JTIDS, solidifying its importance in military operations.