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Additional information, Usb terminology – BenQ RM8602K 86" Class 4K UHD Educational Touchscreen LED Display User Manual

Page 18

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18

Display installation guide

Additional information

Your LCD display provides USB 2.0 ports for connecting to various devices including
computers, flash drives and wireless LAN adapters. This section provides basic information
about the USB 2.0 interface and serves as a reference for the deployment of your USB
connections.

USB terminology

Term

Description/explanation

Host,

Function

A USB network consists of one master and multiple slave devices in a star
topology as illustrated below:

The master device (referred to as the “Host”) is on top of all other slave devices
(called “Function”). A computer is the most common USB host. Any device that
has a USB host controller and related hardware and software installed can also
become a USB host. A USB function can be a USB mouse, keyboard or storage
device.

A maximum of 7 tiers (including the root tier) are allowed in a single USB
network. Note that a USB device that performs both as a hub and a function
occupies two tiers.

Tier 1 (root tier)

Tier 7

Tier 6

Tier 5

Tier 4

Tier 3

Tier 2

Function

Function

Host

Root hub

Function

Function

Function

Hub A

Hub A

Function

Function

Hub A

Hub C

Hub A

Hub B

Function

Function

Function

Hub A

Hub D

Function

Function

Function

Hub A

Hub E

Function

Function

Function

Hub A

Hub F

Function