Test selection matrix

Select test type here	Select your device here
Select test type here	Tetrapolis or Inferno	2x (Tetrapolis or Inferno)	Twister or Twister2	2x (Twister or Twister2)	Metropolis	2xMetropolis	AUI Forte	2x AUI Forte
Bit Error Rate measurement	measure	measure	measure	measure	measure	measure	measure	measure
Packetloss measurement	measure	measure	measure	measure	measure	measure	measure	measure
Noise Equivalent Distance measurement	measure	<- do each device separately	not applicable	not applicable	measure	<- do each device separately	not applicable	not applicable
SNR(*) difference measurement	measure	<- do each device separately	not applicable	not applicable	measure	<- do each device separately	not applicable	not applicable
Duty cycle preemphasis test	test	<- do each device separately	not applicable	not applicable	test	<- do each device separately	not applicable	not applicable

*) SNR=Signal to Noise Ratio

Extra tests:

Explanation of test types

	Test type	Explanation
	Noise Equivalent Distance measurement	The received signal goes weaker with increasing distance between transmitter and receiver. NED is the distance at which the received signal has the same strength as the noise generated in the receiver. This is the actual measure of the range of the system, independent from user's requirements on transmission reliability.
	SNR difference measurement	SNR is Signal to Noise Ratio. It's ratio between signal received by receiver to noise generated in the receiver. But the signal strength and noise level is depending on frequency: the signal path is frequency dependent and the noise spectrum is frequency dependent as well. Therefore the SNR will be different for 10MHz and 5MHz which are the two fundamental frequencies of the data transmission. SNR difference says how much it differs and therefore shows an approximate picture how much the signal gets deformed on the way.
	Duty cycle preemphasis test	The LED is running close (red) or very close (infrared) of it's maximum speed. It has generally different time necessary to turn on and turn off. If this difference weren't compensated, the difference would have the same effect as permanent noise in the signal and would reduce range. There is a circuit in the transmitter which compensates the difference, but the setting is different for every piece of LED and transmitter. Therefore the circuit has to be adjusted to obtain maximum performance. This test reveals whether the setting is at the optimum point or not.
	Bit Error Rate (BER) measurement	This tells the probability that a bit gets flipped during the transmission through the system. It indicates whether the device is working properly or not.
	Packetloss measurement	Similar to BER measurement, but depends on packet length. Indicates whether the device is working properly or not, and can be performed on wider variety of platforms than BER measurement.

Gallery[1e03]

Sub-guides

This is just for completeness.

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