4G technologies are designed to provide IP-based voice, data and multimedia streaming at speeds of at least 100 Mbit per second and up to as fast as 1 GBit per second. 4G LTE is one of several competing 4G standards along with Ultra Mobile Broadband (UMB) and WiMax (IEEE 802.16).
An electrical ballast is a device placed in line with the load to limit the amount of current in an electrical circuit. It may be a fixed or variable resistor.
Smart-lighting emergency ballast for fluorescent lamps The function of a traditional emergency lighting system is the supply of a minimum illuminating level when a line voltage failure appears. Therefore, they have to store energy in a battery module to supply the lamps in that case of failure.