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Difficulty: MediumMobile Device Ports and Accessories

A field technician is setting up a ruggedized mobile smartphone for an inspector who needs to attach a USB flash drive directly to the device to offload data files without connecting to a computer. When the flash drive is attached using a standard adapter, the smartphone does not recognize the storage drive. Which feature must the smartphone's hardware and operating system support to allow it to function as a host device for external USB accessories?

  1. USB On-The-Go (USB OTG)Answer
  2. B
    Thunderbolt protocol tunneling
  3. C
    Mobile Device Management (MDM)
  4. D
    Exchange ActiveSync

Answer

USB On-The-Go (USB OTG) is the feature that allows mobile devices to act as hosts for external USB devices.
USB On-The-Go (USB OTG) is an extension of the USB standard that allows mobile devices to alternate between client and host roles. When USB OTG is supported, the mobile device can power attached peripherals such as flash drives and read/write data directly.

Step-by-Step Solution

1
Identify the mobile device role requirement
The smartphone must act as a USB host controller rather than a passive USB client device.
Standard mobile devices act as client devices when connected to PCs; to host peripherals like flash drives, role switching is required.
2
Evaluate the connectivity standard that enables USB host functionality on mobile ports
USB On-The-Go (USB OTG) allows mobile ports (Micro-USB or USB-C) to negotiate host status.
USB OTG specifies signal lines and protocol extensions that enable a mobile device to power and interface directly with peripherals.

Key Concept

USB On-The-Go (USB OTG) Host Capabilities on Mobile Devices
Estimated Time:1m 0s
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Topics

Mobile Device Ports and Accessories

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