List of abbreviations:

• AIT - Assembly Integration and Testing
• AOS - Advanced Orbiting Systems
• API - Application Programming Interface
• ARQ - automatic repeat request (for retransmission, in a protocol)
• AU - Authentication Unit
• BCH - Bose-Chaudhuri-Hocquenghem (error correction code)
• BIF - Built-In-Failure
• CADU - Channel Access Data Unit
• CCSDS - Consultative Committee for Space Data Systems
• CFDP - CCSDS File Delivery Protocol
• CLCW - Communications Link Control Word (was Command Link Control Word)
• CLTU - Communications Link Transmission Unit (was Command Link Transmission Unit)
• COP - Communications Operation Procedure (was Command Operation Procedure)
• COPM - COP management (service)
• COTS - commercial off-the-shelf (product)
• CPN - CCSDS Principal Network
• CRC - cyclic redundancy check (error detection code)
• CVCDU - Coded Virtual Channel Data Unit
• ECSS - European Cooperation for Space Standardization
• EGSE - Electrical Ground Support Equipment
• ESA - European Space Agency
• FARM - Frame Acceptance and Reporting Mechanism
• FIFO - first in, first out (queue)
• FOP - Frame Operation Procedure
• FSH - Frame Secondary Header
• ID - identifier
• IP - Internet Protocol (as in IPv4 and IPv6)
• JPL - Jet Propulsion Laboratory
• LAC - Logical Authentication Channel
• MAP - Multiplexer Access Point
• MAPA - MAP Access (service)
• MAPP - MAP Packet (service)
• MAP-SDU - MAP Access Service Data Unit
• MCF - Master Channel Frame (service)
• MC-FSH - Master Channel Frame Secondary Header
• MC-OCF - Master Channel Operational Control Field
• OCF - Operational Control Field
• PSS - (reference for ESA standards)
• PVN - Packet Version Number
• SCID - spacecraft identifier
• SCPS - Space Communications Protocol Standard
• SDU - Service Data Unit
• SLAP - Space Link ARQ Procedure
• SLS - Space Link Subnetwork
• TC - telecommand
• TCP - Transmission Control Protocol (as in TCP/IP)
• TM - telemetry
• TTC - telemetry, tracking and command (or commanding or control)
• UDP - User Datagram Protocol
• VC - Virtual Channel
• VCA - Virtual Channel Access (service)
• VCA-SDU - Virtual Channel Access Service Data Unit
• VCDU - Virtual Channel Data Unit
• VCF - Virtual Channel Frame (service)
• VC-FSH - Virtual Channel Frame Secondary Header
• VCID - Virtual Channel identifier
• VC-OCF - Virtual Channel Operational Control Field
• VCP - Virtual Channel Packet (service)