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Iridium
Dial-Up Data

Iridium Dial-Up Data Service is an asynchronous, circuit-switched, 2400 bits per second (bps), and bi-directional service.

Data calls can be originated:

  • From an Iridium Subscriber Unit (ISU) to the Public Switched Telephone Network (PSTN)
  • From the PSTN to another ISU
  • From one ISU to another ISU

An RS232C interface with AT Commands is used for making a data call.  Data connections to the PSTN operate at 2400 bps.  Terminating PSTN modems should be configured to start negotiating at 4800bps in order to minimize modem negotiated time.  A document detailing the AT Commands is available to authorized developers.

Dial-Up data is suitable for applications that require direct computer-to-computer or device-to-device connections.  Each device or computer should be connected to a PSTN modem or an ISU.  Sample applications for this type of service include:

  • Connecting Remote Terminal Units (RTUs) to central control and monitoring systems
  • Connecting monitoring equipment to central data collection systems
  • Continuous real-time transfer of data
  • Dialing into an Internet Service Provider (ISP)
  • Dialing into a Local Area Network (LAN)

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