ETSI Group Specifications (GS) are deliverables produced by Industry Specification Groups (ISG). GSs are written with the style of a Technical Specification (TS)@ and represent the sole view of the ISG members. The present document describes system-level requirements that apply to the Open Radio equipment Interface (ORI) and ORI nodes for Release 1. NOTE: Requirements comply with CPRI specification of CPRI forum [1] and focuses on the following 3GPP radio access technologies namely UTRA-FDD [3]@ [4] and [5]@ E-UTRA-FDD [6] and E-UTRA-TDD [6]. Multiplexing between UTRA-FDD and E-UTRA-FDD is also considered.