Hurricane Watch: An announcement that sustained winds of 64 knots (74 mph or 119 km/hr) or higher are possible within the specified area in association with a tropical, subtropical, or post-tropical cyclone.
PSTN Definition The public switched telephone network (PSTN) is the worldwide collection of interconnected public telephone networks that was designed primarily for voice traffic. The PSTN is a circuit-switched network. That is, a dedicated circuit (also referred to as a channel) is established for the duration of a transmission, such as a telephone call.
PSTN is one of the foundation technologies of telephony - electronic voice communications. While the original forms of telephony including PSTN all relied on analog signaling, modern telephony technologies employ digital signaling, work with digital data, and also support Internet connectivity.