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4K-9000 USER MANUAL V1.1
© 2018 Smart-e (UK) Ltd
www.smart-e.co.uk
PAGE | 41
18
MAX ERROR READINGS
Another statistical reading are the maximum error readings, these are applicable only to the 4K-RX9000.
These readings are displayed on the LCD in the form MAXERR, then follows a letter between A and D
representing the four cable pairs. The maximum error is a decimal number between 0 and 255. It is a count
of the maximum number of bit errors out of all the packets sampled since the 4K-RX9000 has been running.
As explained in section 6.1 of this manual, it is possible to count and calculate the exact number of errors
within a packet of data. Therefore, the lower the values of the max error readings the better. All max error
readings should be below 100, the maximum value of 255 is the maximum number of errors it is possible to
read, the value could actually be more than 255 but if this value is read and is present on and of the four
channels of the 4K-RX9000 it suggests a major source of interference and most likely a video drop out has
been encountered at some point. If one or more channels but not all four have a raised number of errors, it
points towards a possible issue in the CATx cable. If all four readings are raised, it suggests excessive noise is
being encountered and the measures outlined in section 6 of this manual should be referred to, ensure all
cabling advice and installation best practices are being followed to reduce noise ingress in to the CATx cabling.
NOTE: It has been seen during testing that when a HDMI cable is removed from either a transmit or
receive HDBaseT device, it can cause the max error readings to climb until eventually all channels read
255. This is likely to be a timing bug within the CRC structure of the Valens device. If this issue is
encountered it is advised to remove the power supply from the receiver unit and repower. Allow the system
to settle again with all video and CATx cables attached and this will then produce a reliable reading for the
max errors on all channels.
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