Up to how many different universal serial bus (USB) devices can be connected to a single host controller?

Up to how many different universal serial bus (USB) devices can be connected to a single host controller?

• A. 107
• B. 117
• C. 127
• D. 137

Answer: (C)

The correct answer is based on the USB protocol's design, which allows a maximum of 127 devices to be connected to a single host controller. This includes the host controller itself and up to 126 additional devices. The configuration utilizes a tree structure with a single host at the root, allowing for a variety of devices to connect through hubs, which are also considered a type of USB device. The total count includes all devices directly connected to the host and those connected through hubs, supporting a conclusion that up to 127 devices can interface concurrently. Therefore, the proper understanding of USB architecture and the limitation placed by the protocol is essential for anyone working with or maintaining USB connections in biomedical equipment.

The correct answer is based on the USB protocol's design, which allows a maximum of 127 devices to be connected to a single host controller. This includes the host controller itself and up to 126 additional devices. The configuration utilizes a tree structure with a single host at the root, allowing for a variety of devices to connect through hubs, which are also considered a type of USB device.

The total count includes all devices directly connected to the host and those connected through hubs, supporting a conclusion that up to 127 devices can interface concurrently. Therefore, the proper understanding of USB architecture and the limitation placed by the protocol is essential for anyone working with or maintaining USB connections in biomedical equipment.