What is OTG?

USB OTG (On-The-Go) allow USB ports to act as a Host or Device

OTG is a type of USB standard specification. The micro-B USB ports available on some test sets are often referred as OTG or USB OTG, to indicate their type and capabilities.

When configured as a Host (default), these USB ports act like normal ports and can accept external Devices (dongles), such as memory sticks, fiber scopes, WiFi/LAN adapters, etc. A micro-B USB (male) to USB A or C (female) adapter cable may be required to accommodate the external Device connector.

Certain test sets may also offer the ability to act as a Device (peripheral). That is, they would look like a USB memory stick, when connected to another USB Host. It would allocate any extra storage space to share with the host. To enable the USB Device mode, go to >System Tools >Settings Global >OTG Port Mode = Device. A micro-B USB (male) to USB A or C (male) adapter cable is required to accommodate the Host's connector.

The USB OTG defines two roles for devices, specifying which side supplies power to the link and which is initially the host:

  • The OTG A device is the Host and power supplier.
  • The OTG B device is the Device/Peripheral and power consumer.