Black Box ACU4222A - Manual (Page 26)

TROUBLESHOOTING
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I can’t select the video mode I need.
For non-standard resolutions, choose the monitor manually through the operating
system, and set to ignore DDC. Contact Technical Support if you have problems
selecting your required graphics mode.
Can the extender be used with RGB video?
Yes.
4.2 USB
Why does the Extender stop working when I attach a USB hub to the Remote unit?
If additional USB hubs are attached to the extender, the maximum extension
distance will be reduced (due to the delay imposed by each hub). For each
connected hub, you may lose up to 10m of extension distance. Any USB device to
which additional USB peripherals may be attached is a USB hub (e.g. an Apple®
USB keyboard).
Will the USB Micro Extender work with USB 2.0?
The extender will operate perfectly through USB 2.0 Host Controllers. However,
the speed will be restricted to that of a USB 1.1 hub (12Mb/s). Devices that are
USB 2.0 compliant will operate if they are backwards compatible with USB 1.1. If
you have a device that demands the high-speed mode of USB 2.0 then it will not be
compatible with the USB Micro Extender.
Is the USB Micro Extender compatible with all USB devices?
This product range extends the distance at which USB peripherals may be operated
by making full use of the bus timeout period allowed by the USB protocol. The
extender should be compatible with the majority (but not all) of CPU USB Host
Controllers and USB peripherals on the market.
Extended USB devices are unstable and ‘drop out’.
Check that the interconnect cable is not routed near power lines or other sources of
electrical interference. Use shielded STP/FTP cable instead of UTP cable and
ensure the shield connection is maintained between the Extender units. Check
system grounding.
The extension distance is too great for your CPU/USB device combination. Try
reducing the interconnection cable length if possible.
Some of my USB devices do not operate over the full range.
The maximum extension range is nominally 150ft (50m). In practice, the maximum
distance achievable may be between 120ft (40m) and 180ft (60m) depending on
your system and USB devices. Adding external USB hubs may decrease the
maximum extension distance by up to 30ft (10m) for each hub added. Adding bus-
powered hubs in front of the Local Unit is not recommended.