What type of analog coaxial cable connector requires pushing and twisting to firmly connect?

The BNC (Bayonet Neill-Concelman) connector is known for its distinctive locking mechanism that involves pushing and twisting to achieve a secure connection. This design allows for a stable and reliable connection in applications like closed-circuit television (CCTV) systems, where maintaining a strong signal integrity is critical. The bayonet mount prevents accidental disconnection and enables quick connects and disconnects, which is particularly useful in situations where equipment may need to be frequently changed or adjusted.

In comparison, RCA connectors typically use a simple plug-and-socket mechanism with no locking feature, making them easier to connect but less secure. SMA connectors are primarily used in RF applications and have a threaded connection rather than a push-and-twist mechanism. Lastly, ST connectors are commonly used in fiber optics and also have their own unique connection mechanism that does not involve the pushing and twisting characteristic of BNC connectors. Thus, the distinctive locking feature of the BNC makes it the correct answer in this scenario.