| ACK： | Generally, a byte or message sent to acknowledge successful receipt of a packet or message.
Specifically, the ASCII control character octet of value 0x06. |
| ARQ： | A transport protocol is said to be an ARQ protocol if it uses positive and negative
acknowledgments and sender timeouts, and further employs packet replacement on request to
overcome packet loss or corruption over noisy or unreliable channels. |
| CRC： | An error check algorithm based on polynomial division over a binary field. |
| CRC-CCITT： | A specific CRC, defined by its polynomial, initial conditions for accumulation, and terminal
conditions, as defined by ITU Recommendation X.25 (which was once CCITT recommendation
X.25). |
| DLE： | An ASCII control character, an octet of value 0x10, this character is used in the implementation of
data transparent protocols such as those consistent with [X3.28]. |
| EMI： | Interference by electromagnetic signals that can cause reduced data integrity and increased error
rates on communication channels. |
| HMI： | See “OCU – Operator Control Unit” |
| IANA： | The IANA is responsible for assignment of IP addresses, top level domains and Internet protocol
code point allocations (such as port assignments). The IANA assignment data is maintained on
the IANA website, http://www.iana.org. |
| IETF： | The engineering body responsible for technical specifications, definitions and direction for the
continued development of internet technologies. |
| IGMP： | A communications protocol used to manage the membership of multicast groups in IP networks. |
| IP： | The internet layer of the TCP/IP protocol suite stack defines the packet format for message
packets to be sent across an internet, and the protocol delivering those packets to their intended
destination. The protocol is Internet Protocol (IP); the packet defined is the IP datagram. |
| IPS： | The protocol suite defining network communications using the TCP/IP family of protocols. |
| ISO： | A non-governmental organization that leverages the activities of the national standards
organizations of 146 countries, ISO is the largest developer of technical standards in the world. |
| JAUS： | An architecture for use in the research, development, design, acquisition and deployment of
Unmanned Systems |
| JTCP： | The standard for the transmission of JAUS messages over TCP communications links, as
defined in Section 6.2 of this document. |
| JUDP： | The standard for the transmission of JAUS messages over UDP communications links, as
defined in 6.1 of this document. |
| JSerial： | The standard for the transmission of JAUS messages over serial communications links, as
defined in Section 7 of this document. |
| MSN： | A unique identifying “serial number” assigned to packets as transmitted; the MSN is typically
used in the detection of missed messages, in providing assurance of correct sequence of
delivery, and in the requesting of retries when multiple outstanding messages are supported. |
| MTU： | The Maximum Transfer Unit (MTU) is a term for the size of the largest datagram that can be
passed by a layer of a communications protocol. |
| NAK： | Generally, a byte or message sent to indicate unsuccessful receipt or non-receipt or a packet or
message. Specifically, the ASCII control character octet of value 0x15. |
| OCU： | A device by means of which a human operator may control an Unmanned System. |
| OSI： | A data communications model developed by ISO to assure communications interoperability
across disparate systems. |
| PDU： | An application message (for the purposes of this specification, this will be assumed to be a JAUS
message) being propagated down the protocol stack on the sender side, or up the protocol stack
on the receiver side. |
| PPP： | An encapsulation protocol for sending IP datagrams across serial communications links, PPP
also incorporates strong blockchecks, control protocols and a high degree of configurability.
[RFC1661] |
| RA： | The Reference Architecture is the technical specification used to implement unmanned systems
in compliance with the Joint Architecture for Unmanned Systems (JAUS). |
| RF： | Electromagnetic energy or signaling based thereon whose frequency is normally associated with
radio wave propagation. |
| SLIP： | An encapsulation protocol for sending IP datagrams across serial communications links.
[RFC1055] |
| SDP： | A communications protocol that is defined by implementation of it’s lexicons in software. It is
assumed to be an addressed entity, message based protocol |
| TCP： | A reliable, connection-oriented message delivery protocol defined by [RFC793] and related IETF
documents. |
| UMS： | |
| UAV： | An unmanned aerial vehicle; may be teleoperated or autonomous. |
| UGV： | An unmanned ground vehicle; may be teleoperated or autonomous. |
| USV： | An unmanned surface-of-water vehicle; may be teleoperated or autonomous. |
| UUV： | An unmanned undersea vehicle; may be teleoperated or autonomous. |
| UDP： | An unreliable best-effort connectionless message delivery protocol defined by [RFC768] and
related IETF documents. |