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  2. Troubleshoot a broadband internet connection - AOL Help

    help.aol.com/articles/troubleshooting-a...

    Reboot your modem/router - Sometimes the old "turn it off and on again" approach actually does work! Just wait about five minutes before turning it back on to make sure everything was reset. Just wait about five minutes before turning it back on to make sure everything was reset.

  3. NO CARRIER - Wikipedia

    en.wikipedia.org/wiki/NO_CARRIER

    Three network interface widgets (2 Ethernet and 1 WiFi) showing two network interfaces being up, one being down with no cable plugged in (hence: "no carrier"), underlined in red. NO CARRIER (capitalized) is a word code transmitted from a modem to its attached device (typically a computer ), indicating the modem is not (or no longer) connected ...

  4. POST card - Wikipedia

    en.wikipedia.org/wiki/POST_card

    Two POST seven-segment displays ("Q_CODE1" and "Q_CODE2", lower-left), integrated on a computer motherboard. Diagnostic cards are today mainly used by designers of motherboards and extension cards, along with logic analyzers and other debug tools and interfaces. They are less commonly used in the 21st century for computer repair and by system ...

  5. Hayes AT command set - Wikipedia

    en.wikipedia.org/wiki/Hayes_AT_command_set

    The person at computer B issues the modem escape command. (Alternately, and more commonly, the computer B could drop the DTR, or Data Terminal Ready signal, to achieve a hangup, without needing to use +++ or ATH.) OK: The modem acknowledges it. ATH: The person at computer B issues a hang up command. NO CARRIER: OK

  6. Troubleshoot a dial-up connection - AOL Help

    help.aol.com/articles/troubleshooting-a-dial-up...

    Unplug all phone devices in your home - Unplug all phone devices in your home, then reconnect just the modem. Try to connect online, and if it works, plug in each device one at a time until you find the one causing the problem. Restart your computer and modem - Sometimes the old "turn it off and on again" approach actually does work! Just wait ...

  7. Power-on self-test - Wikipedia

    en.wikipedia.org/wiki/Power-on_self-test

    BIOS POST card for ISA bus BIOS POST card for PCI bus Professional BIOS POST card for PCI bus Two POST seven-segment displays integrated on a computer motherboard. The original IBM BIOS made POST diagnostic information available by outputting a number to I/O port 0x80 (a screen display was not possible with some failure modes). Both progress ...

  8. Data Carrier Detect - Wikipedia

    en.wikipedia.org/wiki/Data_Carrier_Detect

    Data Carrier Detect (DCD) or Carrier Detect (CD) is a control signal present inside an RS-232 serial communications cable that goes between a computer and another device, such as a modem. This signal is a simple "high/low" status bit that is sent from a data communications equipment (DCE) to a data terminal equipment (DTE), i.e., from the modem ...

  9. Command mode and Data mode - Wikipedia

    en.wikipedia.org/wiki/Command_mode_and_Data_mode

    The modem uses the Data Carrier Detect (DCD) pin to signal whether it's connected to a host. The computer can generally just read the DCD pin at any time and always know if the modem is in command or data mode. DCD high means data mode, and low means command mode. DCD is a signal sent from the modem to the computer.