Emerson Avocent HMX, Installer/User Manual

Page: 43 / 46

Appendices .....
39
Solutions
Ensure that the HMX transmitter is set to supply a single-link EDID to the graphics card. When the
video source is changed to a single-link video resolution, the pink screen should disappear and the
video should be displayed normally. Alternatively, change the monitor to a single-link DVI monitor.
It is important not to mix dual-link transmitters with single-link receivers.
On an HMX Advanced Manager controlled system, verify the Video compatibility checkbox is
enabled to ensure the correct video mode is displayed for the monitor being used.
Audio output of the receiver sounds scratched
Audio crackle, like blinding, is a symptom of missing packets.
Solutions
See Solutions under blinding.
HMX Advanced Manager cannot locate HMX extenders
The following are possible causes:
• The HMX units must be reset to their zero config IP addresses for HMX Advanced Manager
discovery. If you have a working network of HMX units without HMX Advanced Manager and
then add HMX Advanced Manager to the network, the HMX Advanced Manager will not
discover the HMXs until they are reset to the zero config IP addresses.
• Layer 2 Cisco switches may have Spanning Tree Protocol (STP) enabled but not have
portfast enabled on the ports to which HMX units are connected. Without portfast enabled,
HMX units are assigned the same zero config IP address at reboot and HMX Advanced
Manager only acquires them one at a time on a random basis.
You can easily tell whether portfast is enabled on a switch that is running STP. When you plug
the link cable from a working HMX unit into the switch port, check how long it takes for the port
indicator to change from orange to green. If it takes roughly one second, portfast is on; if it
takes roughly thirty seconds, portfast is disabled.
Solutions
• Ensure the HMX units and the HMX Advanced Manager server are located in the same
subnet. HMX Advanced Manager cannot cross subnet boundaries.
•
Manually reset the HMX units to their zero config IP addresses.
• Enable portfast on all switch ports that have HMX units attached to them, or try temporarily
disabling STP on the switches while HMX Advanced Manager attempts to locate HMX units.