Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old June 12th 21, 03:13 AM posted to sci.electronics.repair
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Default KVM power

I've never seen KVM switches needing power before and this one (I bought
several) has no power supply included. But their is a socket for a power
adaptor. Zonet KVM3304. So before I swithc everything over and find out it
doesn't work, I was hoping someone would tell me if I really need power and
what happens when I don't have it. ie, maybe I should shut down a few of the
machines. THis thing is 4-way. What's a KVM - Keyboard Video Monito switch
that lets you use multiple computers with one console.


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Old June 12th 21, 04:44 AM posted to sci.electronics.repair
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Default KVM power

Thanks

In by legg on Fri, 11 Jun 2021 23:37:49 we perused:
*+-On Sat, 12 Jun 2021 02:13:03 +0000 (UTC),
wrote:

*+- I've never seen KVM switches needing power before and this one (I bought
*+-several) has no power supply included. But their is a socket for a power
*+-adaptor. Zonet KVM3304. So before I swithc everything over and find out it
*+-doesn't work, I was hoping someone would tell me if I really need power and
*+-what happens when I don't have it. ie, maybe I should shut down a few of the
*+-machines. THis thing is 4-way. What's a KVM - Keyboard Video Monito switch
*+-that lets you use multiple computers with one console.

*+-No experience with that model, but static switches conventionally
*+-require little power. If it's a higher quality video monitor, it
*+-might need buffers that have a slightly higher power requirement.

*+-Any reviews I've read indicate that this model gets sufficient
*+-power from PS2 ports. If you're only using the video ports, or
*+-using a usb-ps2 adapter, it might not be so straight forward.

*+-RL


--
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blog: panix.com/~vjp2/ruminatn.htm - = - web: panix.com/~vjp2/vasos.htm
facebook.com/vasjpan2 - linkedin.com/in/vasjpan02 - biostrategist.com
---{Nothing herein constitutes advice. Everything fully disclaimed.}---




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Old June 15th 21, 10:43 PM posted to sci.electronics.repair
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Default KVM power

On Sat, 12 Jun 2021 02:13:03 +0000 (UTC),
wrote:

I've never seen KVM switches needing power before and this one (I bought
several) has no power supply included. But their is a socket for a power
adaptor. Zonet KVM3304.


This one?
https://www.amazon.com/Zonet-4-Port-KVM-Switch-cables/dp/B000KUWXCS
"Each unit comes with a set of 4 PS/2 cables, each cable is 3 feet
long. No power supply is needed.... each switch draws its power
directly through the cables that attach to the desktop."

The KVM3304 gets its power from the computer USB port. If you don't
have at least one USB cable plugged into a computah USB port, it won't
power on. I stupidly bought one of these on eBay without the cables.
Big mistake. The designers of this abomination decided to save on the
cost of the USB connectors and instead ran the USB data and power
through each of the 4 video cable. Without these special cables, it
won't work.
https://i.ebayimg.com/images/g/PLYAAOSw4f9f9g8k/s-l1600.jpg
https://www.rackmountsolutions.net/ce-10-combo-3-n-1-kvm-cable-10-ft/

So before I swithc everything over and find out it
doesn't work, I was hoping someone would tell me if I really need power and
what happens when I don't have it. ie, maybe I should shut down a few of the
machines. THis thing is 4-way. What's a KVM - Keyboard Video Monito switch
that lets you use multiple computers with one console.


Did you get the cables with the KVM3304?

According to several web pages and listings the power supply is 9VDC
500ma. However, if you have the correct cables, you shouldn't need an
external power supply.


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Skype: JeffLiebermann AE6KS 831-336-2558


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