1.1 Glossary

This document uses the following terms:

AT command set: The Attention Code (AT) command set is used to issue one or more commands to a modem device. The AT prefix signals the modem that one or more commands are to follow, as specified in [V25TER].

Data-Carrying TinyTP PDU: The TinyTP Protocol distinguishes between PDUs that carry data and PDUs that are used during TinyTP connection establishment. The "Data-Carrying" prefix denotes that the PDU being discussed is used for data exchange and not TinyTP connection establishment.

escape sequence: A series of three consecutive characters (+++) sent to the infrared modem that causes it to exit online data mode and enter online command mode.

Information Access Service (IAS): Each device that implements the set of infrared protocols, specifically [IRLMP], maintains an information base so that one IrDA device can discover what services another IrDA-compliant device offers, as well as gain information about the device itself. This information is held in a number of objects in the information base and is accessed by communicating with the IAS.

IrDA: The Infrared Data Association, often referred to as IrDA, is a nonprofit organization whose goal is to develop globally adopted specifications for infrared wireless communication.

IrDial: A component of the PPP Over IrDA Dialup Protocol that implements modem commands.

IrNet: A component of the PPP Over IrDA Dialup Protocol that implements a data path pass-through between the PPP over HDLC-like framing and TinyTP.

Link Service Access Point Selector (LSAP-SEL): A selector that distinguishes between LSAPs within a station. Legal values for an LSAP-SEL lie in the range 0x00–0x7F. With the exception of the special LSAP-SEL values 0x00 (LM-IAS), 0x70 (Connectionless Data service), 0x71-0x7E (reserved), and 0x7F (reserved for broadcast and currently not implemented), the assignment of LSAP-SEL values is arbitrary. See [IRLMP] section 3.1.2 for more details.

PPP: Point-to-Point Protocol (PPP), as defined in [RFC1661].

SDU: A TinyTP Client Service Data Unit as specified in [IRTTP] section 2.2.3. The SDU defines the maximum size of a data block that can be exchanged between two TinyTP clients. For example, the IrDial Protocol, which is implemented as TinyTP client, may negotiate an SDU size of 10 KB. The TinyTP Protocol segments and reassembles this SDU in multiple PDUs that are transmitted over the infrared link.

service access point (SAP): An identifying label for network endpoints that are used in Open Systems Interconnection (OSI) networking. The SAP is a conceptual location at which one OSI layer can request the services of another OSI layer.

TinyTP: Infrared Data Association Tiny Transport Protocol, as specified in [IRTTP].

TinyTP PDU: A TinyTP Protocol Data Unit as specified in [IRTTP] section 2.3.1. The maximum size of the PDU must be in the range of 64–2048 bytes. See [IRLAP] section 6.6.5 and [IRTTP] section 2.3.1 for more details.

MAY, SHOULD, MUST, SHOULD NOT, MUST NOT: These terms (in all caps) are used as defined in [RFC2119]. All statements of optional behavior use either MAY, SHOULD, or SHOULD NOT.