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EKOLink 100 uses the high-voltage line between transformer substations as a communication path for multi-service of data, teleprotection, voice and video signals. This technology, which has been tried and tested over decades and adapted to the latest standards, has two main application areas: as communications link between substations where a fiber-optic connection does not exist or would not be economically viable, and as a backup system for transmitting protection signals parallel to an installed fiber-optic link. EKOLink 100 could easily link with fiber PCM system through E1 ports. EKOLink 100 supports the transmission of high-speed data from 2400 bps to 384 kbps. The bandwidth is easily field programmable and does not require the exchanging of hardware components. The broadband capacity may be used by the internal digital multiplexer for the transmission of a number of synchronous or asynchronous data channels, or a LAN-interconnection. During tele-protection operation, broadband data transmission is briefly interrupted (alternate purpose). Special algorithms ensure that data transmission is resumed immediately after the fault has been cleared, avoiding a re-synchronization that would introduce extra delay.