IHSE USA 434 Series SD- VUE/5x - Manual (Page 22)

20 SD-VUE USB Mini Extender Range
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 ensuring that 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.
If you are using an alternative USB cable to connect the Local Unit to
the CPU it must be less than 3m in length.
Some of my USB devices do not operate over the full range.
The maximum extension range is nominally 50m. In practice, the
maximum distance achievable may be between 40m and 60m depending
on your system and USB devices. Adding external USB hubs may
decrease the maximum extension distance by up to 10m for each hub
added. Adding bus-powered hubs in front of the Local Unit is not
recommended.
Audio
The audio is very quiet.
The audio I/O is line-level and requires amplified speakers and
connection to devices providing line-level I/O.
The audio is loud but distorted.
Check that the audio input is not greater than line level (4V peak-to-
peak). The USB Mini Extender accepts line-level audio input only.
The microphone output is barely audible.
See Appendix C: Audio/Serial Ports, page 29.
No audio on SD-VUE/50A.
You need to connect the second interconnect cable which is used to
carry audio and serial data.