Echo One
Echo One was the first subspace amplifier deployed by the United Earth starship . It was deployed in August of 2151. ()

In September of 2151, Echo One was destroyed, along with Echo Two, by an unknown alien vessel. ()

Echo One was used by Vice Admiral Forrest to relay a Vulcan request for assistance at Paan Mokar to Enterprise in 2152, suggesting it had been replaced. ()

See also 
 Echo Three

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