InVentry Quick Scan and Aruba 2540 PoE+

[thebatman]

Hello all,

We are in the process of updating out PoE switches to HPE/Aruba 2540s.

So far everything has been good apart from our InVentry Quick Scans (Zebra mk500) that will not power up. After raising a ticket with InVentry support there only answer was to use a PoE injectors.

Has anyone ells have this issue with the switches and anybody know of a way to get them to work with the Quick Scans?

[psydii]

We had similar issues. From memory nosing around the technical specs of the kit they are using, we can to the realisation that despite our switches being PoE+, they did not meet the specific requirements of the kit that InVentry were suppling.

 

We now have to put up with the TP Link PoE injectors hanging on taught wires at a jaunty angle in my otherwise perfect(*) comms cabinets.

 

*not event slight perfect.

[jezi55]

Here we had to use a separate POE injector on our POE switch, its annoying but it worked

[bald_pig]

Is there anything in the log on the switch?

[glen_j]

Same here HP 2530 POE ended up using their POE injectors too.

[thebatman]

Is there anything in the log on the switch?

 

There is nothing in the logs (apart from the switch updating its time with our NTP server.

[john]

I may have mis-read something, the spec of that Zebra item claims its 802.3af PoE support (https://www.zebra.com/gb/en/products/interactive-kiosks/mk500-micro-kiosk.html):

 

Power

DC power: 24V, 625mA PoE: Power-over-Ethernet 802.3af

 

 

Yet 802.3af spec https://en.wikipedia.org/wiki/Power_over_Ethernet#Standard_implementation

 

max current: 350mA

 

so would think the switches are going you are 802.3af you are allowed 350mA and if its pulling more / not asking right it will drop it where as a cheapo PoE adapter will probably not care anything like a switch and thus work as it probably doesn't need that full power but the switch will be being cautious I would guess?

[andy_b]

That's 625mA at 24V though.

 

Power-over-Ethernet 802.3af should be like 48V.

[john]

That's 625mA at 24V though.

 

Power-over-Ethernet 802.3af should be like 48V.

 

True, I would still expect it depends on whats its asking / demanding from the switch, advanced diagnostics / debug settings on the switch will probably reveal a little more if enabled I'd expect.

[ajg]

I think that is the same switch we have our quick scan attached too as well, ended up using the bundled injector to get it working.

[thebatman]

Not tried them, but have been told that this should work on the Quick Scan and our PoE+ switches.

 

https://www.ui.com/accessories/instant-8023af-adapters/

[minimoo]

We've got a mix of 2530/2540 switches - and inventry (albeit bought 18-24 months ago) quickscans. No issues with the HP POE here.

[thebatman]

We've got a mix of 2530/2540 switches - and inventry (albeit bought 18-24 months ago) quickscans. No issues with the HP POE here.

Are you using the Quickscan Zebra mk500? Did you need to change any settings on the switch? As is, out the box, our 2540s will not power our Quickscans but will power our phones and APs.

[eddyc]

Are you using the Quickscan Zebra mk500? Did you need to change any settings on the switch? As is, out the box, our 2540s will not power our Quickscans but will power our phones and APs.

 

We have two quick scans connected to two different HP 5412zl switches on POE+ modules. The quick scans would not power on for love or money so we had to use POE injectors on them which was a PITA really as all over POE kit, wireless, phones and CCTV works fine.

[IrritableTech]

Running our Zebra Mk 500 from a HP 2950 PoE+ switch. I've just checked on the switch and it is sat at 3.5 watts at a reported 54.8v Nothing set on the port out of the ordinary.

 

It was supplied with a PoE adapter but we just chucked it in our switch and off it went I think.

[minimoo]

i've just found the inventry installation document where they included images of the box - MK500 zebra .

@thebatman - under the port/trunk settings -what's the port set to - in terms of auto etc?

[thebatman]

under the port/trunk settings -what's the port set to - in terms of auto etc?

 

I can only assume you mean the switch settings?

For that port it is set to:

• Type=100/1000T
  
• Config Type=Auto
  
• Mode=100FDx
  
• Flow Control=Disabled
  
• PoE=Enabled
  
• Pre-standard Detect=On
  
• LLDP DOT3 TLV (PoE+)=Enabled
  
• LLDP MED TLV (PoE)=Enabled
  
• Power Priority=Low
  
• Power Allocation By=Usage
  
• Enable PoE=Enabled
  

[minimoo]

so just auto - i've spent a the week with a POE device that doesn't work if the switch was set to "Auto-1000" - but with "Auto" comes up fine. In any case, i've definitely got the MK500's working over POE from the switch here. Pretty sure we've not used any injectors!!