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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.