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X. X band alerts mean a radio wave has been detected within the 8.0-GHz to 12.0-GHz range. The X-band is the oldest radar frequency, and these days it's considered outdated if not altogether obsolete.
Uniden was established on February 7, 1966, by its founder Hidero Fujimoto as "Uni Electronics Corp". Uniden became a well-known brand in the 1970s by manufacturing and marketing millions of citizens band radios (CB), under the Uniden brand as well as other companies such as Midland and Realistic, which rebranded the equipment under their own labels.
Digital Signal 1 (DS1, sometimes DS-1) is a T-carrier signaling scheme devised by Bell Labs. [1] DS1 is the primary digital telephone standard used in the United States , Canada and Japan and is able to transmit up to 24 multiplexed voice and data calls over telephone lines.
Digital Signal Designation Bandwidth/data rate Channels (DS0s) Carrier designation DS0 64 kbit/s 1 DS1: 1.544 Mbit/s 24 T1 DS1 3.152 Mbit/s 48 T1c
The SDH standard was originally defined by the European Telecommunications Standards Institute (ETSI), and is formalised as International Telecommunication Union (ITU) standards G.707, [2] G.783, [3] G.784, [4] and G.803. [5] [6] The SONET standard was defined by Telcordia [7] and American National Standards Institute (ANSI) standard T1.105.
Several hand-held Project 25 radios used around the world. Project 25 (P25 or APCO-25) is a suite of standards for interoperable digital two-way radio products. P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide. [1]
The T-carrier is a hardware specification for carrying multiple time-division multiplexed (TDM) telecommunications channels over a single four-wire transmission circuit. It was developed by AT&T at Bell Laboratories ca. 1957 and first employed by 1962 for long-haul pulse-code modulation (PCM) digital voice transmission with the D1 channel bank.
The ensign of the United States is the flag of the United States when worn as an ensign (a type of maritime flag identifying nationality, usually flown from the stern of a ship or boat, or from an installation or facility of the United States Navy, United States Marine Corps, United States Coast Guard or the National Oceanographic and Atmospheric Administration ashore). [1]