ATEN KH1508A User Manual page 29

c) After all the stations are up, power on the computers.
When installing more than one KVM switches:
 The maximum distance between the KH1508A / KH1516A/ KH1532A
and the last switch in the daisy chain cannot exceed 100 meters, regardless
of the number of switches in the daisy chain.
 The maximum distance between any two KVM switches in the daisy chain
cannot exceed 15 meters.
Daisy Chain Installation Diagram
Chapter 2. Hardware Setup
19