BenQ RM8602K Installation Handbook - Page 19

USB connectors and receptacles, USB cable length

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Term Description/explanation Upstream The direction of data transmission from a USB function to a host or hub. Downstream The direction of data transmission from a USB host or hub to a function. Hub A USB device that provides upstream connection (port) to a host and downstream connections (ports) to multiple functions. Root hub A USB host that also performs the functions of a hub. Speed (low-speed, Three different speeds are currently defined in the USB 2.0 specification: full-speed and high- speed) • Low-speed: data transmission at 1.5Mbps • Full-speed: data transmission at 12Mbps Active (selfpowered) device Passive (buspowered) device • High-speed: data transmission at 480Mbps The actual transmission speed is determined by the device with the lower (or lowest) speed. For example, if a low-speed (1.5Mbps) USB peripheral is connected to a high-speed (480Mbps) USB host, the maximum transmission speed between these devices will be 1.5Mbps, not 480Mbps. A USB device that has it own power supply and can operate without the power supplied by the USB host. A USB device that does not have its own power supply and solely relies on the power supplied by the USB host. USB connectors and receptacles USB connectors and receptacles are grouped into two types: Type-A and Type-B. Standard Mini Micro Standard Type-A • Type-A receptacles are used as outputs from host systems Connect Recepta and hubs. or cle • Type-A plugs are always oriented towards the host system and mate with Type-A receptacles. Type-B • Type-B receptacles are used as inputs to hubs or devices. Connect or Recepta cle • Type-B plugs are always oriented towards a USB hub or device and mate with Type-B receptacles. Mini Micro USB cable length For each passive connection between a two USB devices, the maximum length for USB 3.0 is 3 meters, and the maximum length for USB 2.0 is 5 meters. To extend USB connection beyond this length limit, an active extension cable has to be used to ensure stable signal transmission and reliable power supply. Display installation guide 19

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19
Display installation guide
USB connectors and receptacles
USB connectors and receptacles are grouped into two types: Type-A and Type-B.
USB cable length
For each passive connection between a two USB devices, the maximum length for USB 3.0 is 3
meters, and the maximum length for USB 2.0 is 5 meters. To extend USB connection beyond
this length limit, an active extension cable has to be used to ensure stable signal transmission
and reliable power supply.
Term
Description/explanation
Upstream
The direction of data transmission from a USB function to a host or hub.
Downstream
The direction of data transmission from a USB host or hub to a function.
Hub
A USB device that provides upstream connection (port) to a host and
downstream connections (ports) to multiple functions.
Root hub
A USB host that also performs the functions of a hub.
Speed (low-speed,
full-speed and high-
speed)
Three different speeds are currently defined in the USB 2.0 specification:
• Low-speed: data transmission at 1.5Mbps
• Full-speed: data transmission at 12Mbps
• High-speed: data transmission at 480Mbps
The actual transmission speed is determined by the device with the
lower (or lowest) speed. For example, if a low-speed (1.5Mbps) USB
peripheral is connected to a high-speed (480Mbps) USB host, the
maximum transmission speed between these devices will be 1.5Mbps,
not 480Mbps.
Active (self-
powered) device
A USB device that has it own power supply and can operate without the
power supplied by the USB host.
Passive (bus-
powered) device
A USB device that does not have its own power supply and solely relies
on the power supplied by the USB host.
Type-A
• Type-A receptacles are used as outputs from host systems
and hubs.
• Type-A plugs are always oriented towards the host system
and mate with Type-A receptacles.
Connect
or
Recepta
cle
Standard
Mini
Micro
Type-B
• Type-B receptacles are used as inputs to hubs or devices.
• Type-B plugs are always oriented towards a USB hub or
device and mate with Type-B receptacles.
Connect
or
Recepta
cle
Standard
Mini
Micro