There is a passthrough choice on a variety of electrical gadgets. It permits an unmodified signal to "pass through" the object. HDMI, USB, and network passthrough are a few examples of different passthrough kinds.

HDMI Passthrough

Digital audio data received through one or more HDMI connections is processed by a digital decoder (or AVR). Before transmitting the output to the speakers or another device, it may modify the audio stream using an amplifier or other effects. In some circumstances, it is better to keep the data unaltered so that it can be handled by another device in its unaltered form. The "passthrough" option, which is frequently found in the audio options of the AVR, stops the incoming data from being handled.

Some AVRs offer a comparable but distinct choice known as HDMI "standby passthrough". Even when a device is in sleep state, it permits digital data to pass through a particular HDMI interface (plugged in, but not turned on).

USB Passthrough

USB passthrough enables daisy-chaining of USB accessories through one or more devices. A laptop with a USB connection is an everyday illustration. The USB connection on the keypad links to the USB port on the top of the computer, where a mouse can be plugged in. The same service is offered by USB ports, frequently for numerous devices.

Digital data is transmitted through a device via USB passthrough, but USB electricity is not always provided. The passthrough device must provide the required energy if a USB device needs electricity to run (or charge). Powered USB passthrough keyboards typically use two USB cables. An AC adapter may be included with USB ports that supply USB electricity.

Network Passthrough

Any device that transmits data to another device on the network without alteration is referred to as a "passthrough" in networking. However, it could also explicitly apply to a modem or gateway that sends an attached device's IP address.

A setting known as IP passthrough disables the device's routing capabilities and permits data to pass to the following connected device. Similar to "bridge mode," it does not include any firewall or other data handling functions. Network address transformation (NAT) is not necessary thanks to IP passthrough, which also gives the linked device's public IP address.