 Ethernet frame when set to 1. eCPRIMessage, part of the eCPRI common header, indicates the eCPRI message type (0000 0000b = IQ data message; 0000 0010b = Real-time control data message; 0000 0101b = transport network delay measurement message) eCPRIPayload, part of the eCPRI common header, indicates the length of the eCPRI payload, which is defined as the length of the payload after the eCPRI header and up to (not including) padding and/or Ethernet CRC eCPRIPcid/eCPRIRtcid identify the component_eAxC identifier which is the C- or U-Plane data flow association and the equivalent of the CPRI AxC. The "e" stands for extended to indicate the support for multiple component carriers and bands. Multiple DU processes can contribute to a single eAxC and are identified by originating "DU ports." eCPRISeqid. The first octet of this parameter (Sequence ID) is used for identification of missed messages and re-ordering. The second octet (Subsequence ID) is used for verification of ordering (or support of re-ordering) in case of fragmentation at radio transport level. dataDirection indicates Rx (UL, "0") or Tx (DL, "1") operation. payloadVersion, defines the payload version (currently 001b). filterIndex indicates an index to the channel filter to be used between IQ data and air interface, in DL and UL. filterIndex 0000b indicates a standard channel filter where the channel bandwidth matches the carrier bandwidth. When used for Physical Random Access Channel (PRACH) in UL, the channel filter can change depending on PRACH format selected. frameld counts 10Ms frames, frameId = 20 frame number modulo 256. Chapter 6 User-plane application components 227 subframeId counts 1Ms subframes within the 10Ms frame. slotId counts the slot number within the subframe. symbolId counts the symbol number within the slot. sectionId identifies individual data sections described within a C-Plane message. The purpose of the section ID is to map U-Plane data sections to the corresponding C-Plane message associated with the data. Two or more C-Plane d