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Am getting a replacement 9V power supply for a ST-C5KVM-300-E and need to know what polarity is needed or can it support both positive and negative.
Thank you for your inquiry. The Network Technologies Incorporated (NTI) website has the following power information for the ST-C5KVM-300:
Local and remote unit: 110 or 220 VAC at 50 or 60 Hz via AC adapter.
Power Consumption: 10 W (each - local and remote unit).

Looking at the two DC power converters though, both output +9VDC, 0.6A.
https://www.kvm-switches-online.com/pwr-12v-9v0.html
"PWR-12V-9V0,6A is an external 12VDC to +9VDC, 0.6A Power Converter"
https://www.kvm-switches-online.com/pwr-48v-9v0.html
"PWR-48V-9V0, 6A is an external 48VDC to +9VDC, 0.6A Power Converter."
Additionally, the ST-C5KVM-300 manual shows the power connector barrel as having positive polarity.

So, at least for the U.S. version (ST-C5KVM-300), it appears that it accepts a positive polarity. However, we would suggest contacting the Australian NTI distributor directly to confirm that the ST-C5KVM-300-E version is positive, negative or can accept both. http://www.ntikvm.com.au/cat5-300.html
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