Dc Injector

[Blanche Bunnell]

Ibought a Ubiquiti 802.3at injector ( -accessories-poe-injectors/products/u-poe-at) but it only puts out 48V... so the AP is running in reduced power mode. Netgear support says the Ubiquiti injector isn't actually AT compliant because the AT standard is 50V+ (they seem to be correct!).

A parent instance (x calls up) does inject these dependences and as a solution I could pass them along, but I feel there must be a more elegant solution to this. So my actual question is: Is there a way in Play 2.8 to retrieve the injector instance that is used by the application?

Maybe I am missing something very simple, I am rather new to Play and Guice DI, so any help would be greatly appreciated. All the solutions that I found online refer to older versions of play, which do allow direct access to the injector or application objects. The examples from play 2.8 also show how to retrieve the injector, but only in the context of (unit) testing. Also, it is written primarily in Java, rather than Scala.

I see, thank you for the advice and for confirming that indeed @Inject is not an option since the class is instanciated outside of the injection mechanisms. Which makes sense, as the previous developers used:

I agree. The POE device would be powered directly by the injector and not the switch. Think of it this way, when you plug in a computer or any other non-poe device into a poe port on a switch, does the switch go ahead and send power to the device? Nope because it knows the device does not need any power.

Most of the PoE injectors from UBNT (and possibly other manufacturers) are Mode B injectors, so if you have a device that only takes Mode A power (pairs 1-2 and 3-6), it cannot be powered by a Mode B injector that has power on the 4-5 and 7-8 pairs. I never have encountered a switch that used Mode B.

A PoE injector connects your PoE-enabled network device to a non-PoE LAN switch port.More specifically, a PoE injector can be used to connect a wireless access point, IP phone, network camera or any IEEE 802.3af/at-powered device (PD) to a network...

Additionally, it's worth noting that POE injectors are PASSIVE (a little known fact), so even if your switch is only 802.3af 15W, if the injector senses ANY POE power on the non-powered line, it will pass on whatever PoE it detects on to the powered port, and will not 'inject' it's own power (whatever it supports).

If you use the injectors., they can be either at the AP and therefore vulnerable to being unplugged, or in the switch cabinet to keep them protected from interference. If in the cabinet, might as well use a switch!

switch when ever possible more control less points of failure. We have a device that is POE but we had to use the injector due to lack of POE and every time we have to reboot that thing its a trip to that IDF and pull the power wait and plug it back in. It is a hassle.

Can I use any POE injector for the EAP225? (As long as it has the necessary wattage, of course, but the specs say it's 802.3af so I assume any injector should work.) Also (total noob question) are there limitations as to where the injector needs to be placed relative to the switch and/or the AP? To put it another way, if I wanted to, could the injector be placed near the switch with a 50 foot cable running to the AP? Or does the injector need to be placed closer to the AP?

However (and this is also mentioned in the linked FAQ), this does not apply to TP-Link EAPs that come with a passive PoE injector (such as the EAP225 V3) - while it says they are 802.3af-compliant, they only accept one of two possible PoE wiring pinouts (mode B according to the FAQ). PoE power sourcing equipment (PSE) such as an injector or a PoE switch can be either mode A or mode B (or have different pinouts on different ports), and powered devices (PD) must accept both pinouts according to the standard. However this is not the case for "hybrid" devices from TP-Link (and other suppliers) - so you need to make sure your power sourcing equipment provides the required mode. Don't ask how I found out about the different modes :).

One way to ensure that an Ethernet drop will work reliably up to 800 feet (well beyond the specification) is to hard set both ends to 10 Mbps full duplex. At 10 Mbps it uses a different encoding scheme that will almost work through two Dixie cups and a piece of string And 10 Mbps should be more than fast enough for an IP camera.

Good thoughts there, Steve. I connected a laptop to an injector w/no power applied and it connected to my network. So I believe you are correct - the ethernet pairs appear to be acting like they are just wired directly across the input and output ports in the injector.

P.S.

POE Gigabit Injectors -a-poe.com/product-category/Gigabit-Injectors/

Aruba 205 requires 48 volts min, but can accept 56 volts.

Aruba 225 requires 56 volts min. If it gets 48 volts, it will disable (?? if I remember correctly ??) the 2nd 10GB NIC and a few other parts.

Just did several outdoor IP cameras for a gigantic church, using TP-Link 802.3af POE injectors, and had a few that were over 300 feet, and the injector did not help at all. In my experience, it is a dumb device that it is not re-transmitting frames. We ended up putting a second 5 port switch around 200 ft mark and called it a day.

to repeat the signal at the 100 mtr point, you need a hub or switch, powered by PoE in, with PoE out. One solution is the WS-POES-8-7 or the WS-GPOES-8-7. This can be powered by PoE, and will then power up to 7 devices - subject to a roughly 30 total watt limitation. Have a look at that.

You're using the inject function wrong. As the documentation states, the inject function already instantiates a new instance of $injector. My guess is that by passing $injector as a argument to the inject function you are asking it to instantiate the $injector service twice.

One other thing to note. The argument authorService passed to the inject function has been wrapped with '_' so it's name does not hide the variable created within the describe function. Thats also documented in the inject documentation.

Mazzei venturi injectors are differential pressure injectors with internal mixing vanes. The unique, patented design of Mazzei injectors maximizes injector efficiency, suction capacity and mixing capabilities. Our injectors also have no moving parts, which simplifies maintenance, and they have much lower operating costs than less efficient systems.

2024 Mazzei Injector Company, LLC. MAZZEI, MIC, and AIRJECTION are registered trademarks of Mazzei Injector Corporation, as is the configuration of the exterior of the Mazzei injectors. Mazzei products, and processes utilizing those products, are protected under various U.S. patents and non-U.S. patents and patents pending.

Without cleaning, deposits can lead to hard starts, lost acceleration and rough idling. STP Fuel Injector & Carburetor Treatment is specially formulated to maintain clean performance of fuel injectors and carburetors by helping to prevent the accumulation of deposits. A high-quality carrier of active ingredients.

The layout will be very linear - basically APs all in-a-line above the track. The only common point will be in the center which will be well over 100m from the ends. The APs will be mounted high so vandalism shouldn't be too much of an issue but it is something good to consider. Thank you

You can't use a PoE injector to extend the maximum range of Ethernet (which is 100m). If the overall length of the Ethernet is over 100m with a PoE injector in the middle, you are likely to run into reliability problems (or it won't work at all).

If you could run a fibre to a central location and then run 2 or 3 APs copper cabled back to that location, an MS120-8LP will likely give a better solution (and involved a lot less parts). It just doesn't stack up so well if you can only cable a single AP back to where the fibre would terminate.

The Robinair 18465 is a PAG labeled manual oil injector that enables the user to inject PAG type A/C system lubricant back into the vehicle's A/C system. The injector holds 1/2 ounce of oil and includes graduations on the injector in 1/8 ounce increments. The injector is equipped with a low-side R-1234yf service coupler that allows the user to connect to the low side of the vehicle's A/C system. Oil can be injected either before charging or after charging the vehicle's A/C system.

>> binding commands will make other features like overriding bindings

trivial to implementThis is probably not yet available - unless you create new Injector?Injector injector = Guice.createInjector(rewrittenModule);

assertEquals(new Pepsi(), injector.getInstance(Soda.class));Will this help with unbinding as well?

e.g. I have a huge state machine where services come and go, meaning I

would still like to use Guice to handle my binding, but not for the cost

of class leakage - unless Class --> Provider mapping is weak, meaning

once I remove class's classloader that binding goes away as well?Cheers,

Alesbtw: are Commands available in Maven2 repo?

I'm using this in the new JBoss5 kernel.

Imagine having a single Injector at the AS's bootstrap.

And then different apps come and go, and they can register new bindings

making its beans/services available to Guice.I do control the service lifecycle together with its classloader, but if

I cannot remove the binding, probably leaves me with a leakage?OK, I guess I could do things differently, creating Injector per

classloader, and use some sort of hierarchy of Injectors (already exists

afaik), the root being the one at bootstrap.- Ales

An injector is a system of ducting and nozzles used to direct the flow of a high-pressure fluid in such a way that a lower pressure fluid is entrained in the jet and carried through a duct to a region of higher pressure. It is a fluid-dynamic pump with no moving parts except a valve to control inlet flow.

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