The Lenovo LT1421 is a 14 inch monitor that can be connected using a USB B mini to USB A cable. It is shipped with a 1.8 meter cable which is too short for my purpose.
USB is limited to 5 meter, but there exist "active" USB cables that boost the signal. Are such cables sufficient for DisplayLink devices such as this Lenovo monitor or do they only work for things like keyboards? Should I consider other cables or devices instead?
Plugable claims that their 10M USB extension cable works with DisplayLink USB displays (emphasize mine):
Connect USB printers, scanners, displays, keyboards, etc from across the room with this 10 meter / 32 foot USB 2.0 extension cable. Active repeater (bus powered single port hub) and a premium shielded cable enables this unit to have 2x the length of a standard USB cable. The tradeoff, however, is devices with precise timing requirements (isoch devices, usually USB video cameras) will not work with this cable. Will work with nearly all other devices: devices such as printers, scanners, DisplayLink USB displays, keyboards, mice, and most miscellaneous USB devices.
I am unable to verify their claim, nor do I know whether it this cable can be connected with the existing USB-A/USB-B mini connector.