Neb. Rev. Stat. §§ 29-2401
Every person sentenced to the Department of Correctional Services shall, within thirty days, and as early as practicable after his sentence, unless the execution thereof be suspended, be conveyed to the facility designated by the Director of Correctional Services by the sheriff of the county in which the conviction took place, and shall there be delivered into the custody of the division, together with a copy of the sentence of the court ordering such imprisonment, there to be safely kept until the term of his confinement shall have expired, or he shall be pardoned. If the execution of the sentence be suspended and the judgment is afterward affirmed, the defendant shall be conveyed to the facility designated by the director within thirty days after the court shall direct the sentence to be executed.
Neb. Rev. Stat. §§ 29-2401