Specifications

ISU AT Command Reference Introduction
Iridium Proprietary Version 2.45
20 June 2011 3
CI
Cell Identifier
CTS
(V.24 Signal) Clear To Send. This signal is normally used in controlling the flow of data to the ISU.
(See RTS)
DCD
(V.24 Signal) Data Carrier Detect. This is a signal from the ISU that indicates that it is connected to
the far-end modem for data transfer.
DCE
Data Communications Equipment, i.e., a data adaptor or modem. In this product, DCE refers to the
ISU.
DSR
(V.24 Signal) Data Set Ready. This signal, from the ISU, indicates the readiness of the phone to
receive data.
DTE
Data Terminal Equipment, such as a dumb terminal, or a PC running communications software.
DTR
(V.24 Signal) Data Terminal Ready. A signal from the DTE to the ISU. Can be used to terminate
calls.
ESS
ETC SBD Subsystem (synonymous with GSS)
ETC
Earth Terminal Controller
ETSI
European Telecommunications Standards Institute.
FA
Field Application
GSM
Global System for Mobile communications.
GSS
Gateway SBD Subsystem (synonymous with ESS)
IRLP
Iridium Radio Link Protocol
ISU
Individual Subscriber Unit
LAC
Location Area Code
Modem
MOdulator/DEModulator. A device used to convert digital signals to analog signals for transmission
and reception of telephone lines.
MO