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  2. No fault found - Wikipedia

    en.wikipedia.org/wiki/No_fault_found

    The unit is then checked, but no anomaly is detected by the maintainer. Consequently, the unit is returned to service with no repair performed. [1] [2] [3] If there is an underlying fault that has not been detected the unit may be returned for repair several times with no fault identified. Alternative descriptors include: [4] No fault found (NFF)

  3. Unified Diagnostic Services - Wikipedia

    en.wikipedia.org/wiki/Unified_Diagnostic_Services

    The service "ECU reset" is used to restart the control unit (ECU). Depending on the control unit hardware and implementation, different forms of reset can be used: 0x11 01 Hard Reset simulates a shutdown of the power supply. 0x11 02 key Off-On Reset simulates the drain and turn on the ignition with the key.

  4. AOL Mail Help - AOL Help

    help.aol.com/products/new-aol-mail

    You've Got Mail!® Millions of people around the world use AOL Mail, and there are times you'll have questions about using it or want to learn more about its features. That's why AOL Mail Help is here with articles, FAQs, tutorials, our AOL virtual chat assistant and live agent support options to get your questions answered.

  5. Power-on self-test - Wikipedia

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

    With boot times more of a concern now than in the 1980s, the 30- to 60-second memory test adds undesirable delay for a benefit of confidence that is not perceived to be worth that cost by most users. Most clone PC BIOSes allowed the user to skip the POST RAM check by pressing a key, and more modern machines often performed no RAM test at all ...

  6. Service data unit - Wikipedia

    en.wikipedia.org/wiki/Service_Data_Unit

    Each unit of data that layer (n) gives to layer (n-1) below is in turn handed down as a layer (n-1) SDU. When the PDU of layer (n+1) , plus any metadata layer (n) would add; would exceed the maximum size a layer-n PDU can be (called layer (n) 's maximum transmission unit ); the SDU must be split into multiple payloads for layer (n) ; a process ...

  7. CSU/DSU - Wikipedia

    en.wikipedia.org/wiki/CSU/DSU

    The channel service unit (CSU) is responsible for the connection to the telecommunication network, while the data service unit (DSU) is responsible for managing the interface with the DTE. A CSU/DSU can have an external connection point or it can be integrated into a modular card installed in a router.

  8. Reset (computing) - Wikipedia

    en.wikipedia.org/wiki/Reset_(computing)

    Reset places less stress on the hardware than power cycling, as the power is not removed. Many computers, especially older models, have user accessible "reset" buttons that assert the reset line to facilitate a system reboot in a way that cannot be trapped (i.e. prevented) by the operating system, or holding a combination of buttons on some ...

  9. Data service unit - Wikipedia

    en.wikipedia.org/wiki/Data_service_unit

    The device converts bipolar digital signals coming ultimately from a digital circuit and directly from a Channel service unit (CSU), into a format (e.g. RS- 530) compatible with the piece of data terminal equipment (DTE) (e.g. a router) to which the data is sent. The DSU also performs a similar process in reverse for data heading from the DTE ...