Specifications

February 23, 2000 Motorola Personal Communications Sector Page 2
Satellite Subscriber Products Division
Motorola Personal Communications Sector
Satellite Subscriber Products Division
ISU AT Command Reference Introduction
Bit 6 Reserved
Bit 7 Answer/Originate operation
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 which indicates that the two ends are
connected 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 host system to the ISU. Can be used to terminate
calls.
ETSI
European Telecommunications Standards Institute.
GSM
Global System for Mobile communications.
IRLP
Iridium Radio Link Protocol
ISU
Individual Subscriber Unit
Modem
MOdulator/DEModulator. A device used to convert digital signals to analog signals for transmission
and reception of telephone lines.
Non-transparent
In PLMN data transmission, a configuration where at layer 2, protocol information of the fixed network
is mapped on IRLP elements, and vice versa.
RP
Relay Protocol (used in SMS).
SMS
SMS Short Message Service.
SMSSC
Short Message Service - Service Centre (used in SMS).
TP
Transfer Protocol (used in SMS).
Transparent