Connecting the Modem at the SRX240 Services Gateway End

Before you can connect a dial-up modem to the console port on the SRX240 Services Gateway, you must configure the modem to accept a call on the first ring and accept DTR signals. You must also disable flow control on the modem.

Note: These instructions use Hayes-compatible modem commands to configure the modem. If your modem is not Hayes-compatible, refer to the documentation for your modem and enter the equivalent modem commands.

To configure the modem on the services gateway end:

  1. Connect the modem to a PC or laptop computer.
  2. Power on the modem.
  3. From the PC or laptop computer, start your asynchronous terminal emulation application (such as Microsoft Windows HyperTerminal), and select the COM port to which the modem is connected (for example, COM1).
  4. Configure the port settings as shown in Table 26.

    Table 26: Port Settings for Configuring the Modem on the Services Gateway End

    Port Setting


    Bits per second


    Data bits




    Stop bits


    Flow control


  5. In the HyperTerminal window, enter AT.

    For more information about AT commands, see the following guides:

    • Junos OS Initial Configuration Guide for Security Devices
    • Junos OS Monitoring and Troubleshooting Guide for Security Devices

    An OK response verifies that the modem can communicate successfully with the COM port on the PC or laptop.

  6. Configure the modem to answer a call on the first ring by entering ATS0=1.
  7. Configure the modem to accept modem control DTR signals by entering AT&D1.
  8. Disable flow control by entering AT&K0.
  9. Save modem settings by entering AT&W.

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