BenQ IL430 Installation Handbook page 18

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
Host, A USB network consists of one master and multiple slave devices in a star
topology as illustrated below:
Function
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.
18 Display installation guide
Description/explanation
Tier 1 (root tier)
Tier 2
Function
Tier 3
Function Function
Tier 4
Function
Tier 5
Function Function
Tier 6
Function Function
Tier 7
Host
Root hub
Function
Hub A
Hub A
Function Function
Hub C Hub A
Function
Hub D
Hub A
Hub E
Hub A
Function
Function
Hub B
Hub A
Function
Function
Function
Hub F
Hub A