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30 m CAT6 cable length seems too long
I have tried using a UNIFI AP from an unmanaged 108 switch. It works off 1 m lengths of cable. But when attached to about 30m, the AP connects successfully for 30 seconds and then drops and reports...
Kitsap wrote:
The POE injector that came with my AC-Pro is labeled Unifi but does not list any IEEE compliance standards for POE. It does list a voltage and current output.
The UAP-AC-PRO Data Sheet does state- Power Method Passive Power over Ethernet (48V), 802.3af/802.3at Supported (Supported Voltage Range: 44 to 57VDC) aside of the UAP-AC-PRO being feedable by 802.3af/802.3at, a proprietary power delivery system with a proprietary ethernet injector over ethernet cables.
Worth mentioning, i'm not aware on such odd power distance limits when deploying UniFi devices, too within that proprietary world.
schumaku wrote:
Kitsap wrote:The POE injector that came with my AC-Pro is labeled Unifi but does not list any IEEE compliance standards for POE. It does list a voltage and current output.
The UAP-AC-PRO Data Sheet does state- Power Method Passive Power over Ethernet (48V), 802.3af/802.3at Supported (Supported Voltage Range: 44 to 57VDC) aside of the UAP-AC-PRO being feedable by 802.3af/802.3at, a proprietary power delivery system with a proprietary ethernet injector over ethernet cables.
Worth mentioning, i'm not aware on such odd power distance limits when deploying UniFi devices, too within that proprietary world.
Neither am I, nor does a few minutes of web search turn up anything. I am sure by now the OP has tried more than one injector and compared the supplied injector output specifications with the UAP-AC-PRO input requirements.
There will definitely be a voltage drop at the end of a 30 m Ethernet run. However the injector is connected adjacent to the UAP-AC-PRO device. I do note that Unifi makes several POE injectors with various voltage and power ratings. None of the specification sheets indicate a cable length limitation.
- The injector has always been placed by the AP. So distance shouldn’t be an issue.
The AP powers up and connects (temporarily). So power doesn’t seem to be the issue (but what do I know 🤷🏼♂️).
SteveM58 wrote:
The AP powers up and connects (temporarily). So power doesn’t seem to be the issue (but what do I know 🤷🏼♂️).It is able to establish an Ethernet link, but stops working about 30 seconds later. if this isn't a power issue - what else? The simple ethernet switch isn't part of the connections in the power connection.
SteveM58 wrote:
The injector has always been placed by the AP. So distance shouldn’t be an issue.
The AP powers up and connects (temporarily). So power doesn’t seem to be the issue (but what do I know 🤷🏼♂️).When an electronic device initially powers up, it will start a series of checks (often called boot up). If the series of checks are not completed successfully, it will shut down. For a POE injector, I am sure the startup checks would include voltage, current, and polarity. These could be over specification, under specification, or incorrect. The device shutting down after 30 seconds would indicate the startup sequence is not being successfully completed.
This sequence points to either a bad cable or a bad or marginal device. Possibly to a bad AC power supply for the device.
Have you checked the AC power source where you are connecting the injector? Possibly low voltage, possibly hot and neutral reversed?
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