Gross was detained Dec. 3, 2009, after he was caught importing and installing restricted communications equipment under a program funded by the U.S. Agency for International Development. Such programs aim to promote democracy in the Communist-run country, and Cuba considers them an affront to its sovereignty.
Gross testified at his two-day trial that he was no threat to Cuba and was only trying to improve the Jewish community's Internet access.
He was convicted of crimes against the state and sentenced to 15 years.
Gross' imprisonment has been a major sticking point between longtime Cold War foes Washington and Havana.
Cuba says it wants to negotiate the fate of both Gross and four of its intelligence agents serving long prison sentences in the United States.
The U.S. State Department called on Cuba this week to free Gross "immediately and unconditionally."
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