Terms /and Abbreviations
Asynchronous
A serial data transmission method that uses Start and Stop bits to synchronize reception.
AT Commands
A group of commands that can be sent by a terminal or host computer to control the ISU in Command mode.
Baud
One signaling element per second. This is a measure of the signaling rate on the telephone line. It should not be confused with Bits Per Second (bps) which can differ from the Baud rate.
BCD
Binary Coded Decimal
Bit Mapped Registers
Bit mapping is a technique that allows a single S-Register to hold up to 8 binary variables e.g.:
Reg Type Val Default Function
S14 Bit Mapped 170 Register S14 is a bit-mapped register and provides the following functions:
Bit 0 Reserved
Bit 1 Echo commands to DTE
Bit 2 Responses
Bit 3 Word or number responses
Bit 4 Reserved
Bit 5 Dialing method
Bit 6 Reserved
Bit 7 Answer/Originate operation
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
Mobile Originated (for Short Burst Data)
MOMSN
Mobile Originated Message Sequence Number (for Short Burst Data)
MT
Mobile Terminated (for Short Burst Data)
MTMSN
Mobile Terminated Message Sequence Number (for Short Burst Data)
RI
(V.24 Signal) Ring Indicate. This is a signal from the ISU which indicates that an incoming call is ringing or that an MT SBD message is present at the ESS.
RP
Relay Protocol (used in SMS).
RTS
(V.24 Signal) Request To Send. This signal is normally used in controlling the flow of data from the ISU.
SBD
Short Burst Data
SMS
SMS Short Message Service.
SMSSC
Short Message Service – Service Center (used in SMS).
TP
Transfer Protocol (used in SMS)
XON/XOFF
A standard method of controlling the flow of data to and from a ISU to prevent overflow/overrun conditions.
SBD
Short Burst Data
MO (SBD)
Mobile Originated
Message size is between 1 and 1960 bytes.
MT (SBD)
Mobile Terminated
Message size is between 1 and 1890 bytes. (0 byte messages are referred to as “mailbox checks.”)
DIP
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ISU
Individual Subscriber Unit
SIM
Subscriber Identifier Module
IMEI
LEO
Low Earth orbit
Iridium SBD Delivery Methods
You have three SBD delivery methods and can list 5 total delivery addresses.
- Email: all SBD messages are delivered via email
- IP:PORT
- Another SBD IMEI device
SBD Ring Alert
The Iridium Gateway will send a ‘Ring Alert’ to the Transceiver when a Mobile Terminated SBD (MT-SBD) message has been queued at the Iridium SBD Gateway. Your mobile application can then decide whether to retrieve the MT-SBD data message at that time or later.