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This economy motivates the general idea of an integrated services network. Physically separate USB hubs come in a wide variety of form factors: from external boxes (looking similar to an Ethernet or network hub), to small designs that can be directly plugged into a USB port (see the "compact design" picture). The device with a mini-A plug inserted becomes an OTG A-device, and the device with a mini-B plug inserted becomes a B-device (see above). A device with a micro-A plug inserted becomes an OTG A-device, and a device with a micro-B plug inserted becomes a B-device. The OTG A-device is a power supplier, and an OTG B-device is a power consumer. They contain all pins of the non-Superspeed micro connectors and use the ID pin to identify the A-device and B-device roles, also adding the SuperSpeed pins. USB 3.0 introduced a backwards compatible SuperSpeed extension of the micro-AB receptacle and micro-A and micro-B plugs. USB OTG devices are backward-compatible with USB 2.0 (USB 3.0 for SuperSpeed OTG devices) and will behave as standard USB hosts or devices when connected to standard (non-OTG) USB devices. The main exception is that OTG hosts are only required to provide enough power for the products listed on the TPL, which may or may not be enough to connect to a peripheral that is not listed.

It applies to all targeted hosts, including both OTG devices acting as a host and embedded hosts. At that time, early LAN systems were just coming to market, including Ethernet, Token Ring, Econet, and ARCNET. The TPL specifies products supported by the "targeting" host, defining what it needs to support, including the output power, transfer speeds, supported protocols, and device classes. Its data transfer speed is at 150 kB/s. It uses the central frequency 110 kHz (CENELEC B-band) and has a data rate of 1200 bit/s. It is also possible, however, for a destination node to request the data from the source by sending a remote frame. The newer EPPs (Enhanced Parallel Ports) have an 8-bit data bus, and the same control pins as the normal parallel printer port. Android version 3.1 or newer supports USB OTG, but not on all devices. Because every OTG controller supports both roles, they are often called "Dual-Role" controllers rather than "OTG controllers". OTG hardware design merges all of the controllers into one dual-role controller that is somewhat more complex than an individual device controller.

Hubs may feature power switches for individual ports to allow conveniently power cycling unresponsive devices. For integrated circuit (IC) designers, an attractive feature of USB OTG is the ability to achieve more USB capabilities with fewer gates. USB cables are limited to 3 metres (10 feet) for low-speed USB 1.1 devices. Electrical conduits terminate at the sides and cables pass through or are joined inside the box. Note: There is a risk of equipment damage if 3-pin XLR audio and DMX signals are plugged into each other. If there are not many fiber-optic cables to the node, wavelength division multiplexing can be used to combine multiple optical signals onto the same fiber. A number of countries have zero electrified railways, instead relying on diesel multiple units, locomotive hauled services and many alternate forms of transport. An OTG product must have a single micro-AB receptacle and no other USB receptacles. Pure mini-A receptacles also exist, used where a compact host port is needed, but OTG is not supported. The parallel port interface was originally known as the Parallel Printer Adapter on IBM PC-compatible computers. The adapter enables any standard USB peripheral to be attached to an OTG device.

When an OTG-enabled device is attached to a USB device, such as a flash drive, the device must either end in the appropriate connection for the device, or the user must supply an appropriate adapter ending in USB-A. Some equipment has automatic termination, others a physical switch, while the remainder requires a physical terminator (e.g. male XLR-5 plug fitted with a resistor) to be installed by the user. Server computers may use a serial port as a control console for diagnostics, while networking hardware (such as routers and switches) commonly use serial console ports for configuration, diagnostics, and emergency maintenance access. A horizontal array of horizontal sockets may be easy to fabricate, but may cause only two out of four ports to be usable (depending on plug width). An OTG cable has a micro-A plug on one end, and a micro-B plug on the other end (it cannot have two plugs of the same type).

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