SERVSWITCH
BRAND DVI KVM EXTENDER FAMILY
44
7. Troubleshooting
7.1 Video
There isn’t a picture.
Check the power supply connection at the Local unit. Is the
Device Ready
(Red
LED) at the Local unit illuminated (see page 26)? If not, the internal power-supply
may be damaged or there may be an internal error.
Check the power supply connection at the remote unit. Is the
Device Ready
(Red
LED) at the Remote unit illuminated (see page 26)? If not, the internal power-
supply may be damaged or there may be an internal error.
Check that the Interconnection cable is connected at the Local Unit and the Remote
Unit. Is the
Link Status
LED illuminated (see page 26)? If not, there may be a
problem with the Interconnection cable:
•
Fiber types:
Check that the fiber optical cable is correctly connected. The
strand connected to the Local Unit’s TX (left-hand connector) must run to the
Remote Unit’s RX (right-hand connector) and vice versa.
•
Fiber types:
There may be one or more broken fibers. Do NOT look into a
fiber’s end directly while it is connected to a Local or Remote unit! Are the
Link Status
LEDs at the Local Unit AND at the Remote Unit illuminated? If
they are flashing, check for broken fibers using a flashlight.
•
Fiber types:
Are the cables of the recommended fiber type? If you used your
own fiber optical cable (not supplied by Black Box), please ensure that you
have used 50µ or 62.5µ fiber with a multimode device or a 9µ fiber with a
singlemode device. Other fiber-types and poly-fibers are not supported.
•
CATx types:
Check that you have wired the cable ‘straight through’. ‘Cross
wired’ cables will not work.
•
CATx types:
Check that the cable is correctly wired. Use a CATx cable tester
for checking wrong wired or broken strands.
Check that you are using a supported video mode (see
Appendix D: Video Modes
and Frame Rates
). At the Remote Unit, is the
Video Signal
LED illuminated (see
page 26)?
Check your total system configuration. Local units digitize incoming VGA signals
and must receive perfect SYNC signals: no glitches, spikes or deformed signals are
allowed. Long/wrong or bad cables, or additional components like Splitters or
KVM Switches may deform the SYNC signals.
Also check that the signals (level and signal form) match the VESA Standard
requirements.
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