The goal of the Space Communications Protocol Standards (SCPS) project is to provide a suite of standard data handling protocols which (from a user viewpoint) make a remote space vehicle appear to be just another "node on the Internet".
The SCPS protocols include:

A file handling protocol (the SCPS File Protocol, or SCPS-FP), optimized towards the up-loading of spacecraft commands and software, and the downloading of collections of telemetry data. The SCPS-FP is based on the well-known Internet File Transfer Protocol (FTP).

An underlying retransmission control protocol (the SCPS Transport Protocol, or SCPS-TP), optimized to provide reliable end-to-end delivery of spacecraft command and telemetry messages between computers that are communicating over a network containing one or more potentially unreliable space data transmission paths. The SCPS-TP is based on the well-known Internet Transmission Control Protocol (TCP). Note that the SCPS-TP extensions to TCP will solve similar problems in other environments, such as those of the mobile/wireless and tactical communications communities.

A data protection mechanism (the SCPS Security Protocol, or SCPS-SP) that provides the end-to-end security and integrity of such message exchange. The SCPS-SP is derived from the Secure Data Network (SDNS) "SP3" protocol, the ISO Network Layer Security Protocol (NLSP), the Integrated Network Layer Security Protocol (I-NLSP), and the Internet Engineering Task Force's (IETF) Internet Protocol Security (IPSEC) Encapsulating Security Payload (ESP) and Authentication Header (AH) protocols.

A networking protocol (the SCPS Network Protocol, or SCPS-NP) that supports both connectionless and connection-oriented routing of these messages through networks containing space or other wireless data links. The SCPS-NP is based on the well-known Internet Protocol (IP), with modifications to support new space routing needs and increased communications efficiency.

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