Security engineers must know the truth about Poe powering 1Does Poe Supply stable?With the rapid development of network monitoring in recent years, the technical threshold is also more and more high, the technical support provided by manufacturers is becoming more and more comprehensive and systematic. Tom is a small security June, has been soaked in security market sales for many years, every day with the
Many friends more on what is Poe Switch memory Switch Poe feature is not very well understood, the following system is introduced.What is Poe?Power over Ethernet (PoE) is an IEEE 802.3AF standard powered technology approved in June 2003 that uses the existing network Class 5 (CAT-5) data cable to transmit a DC power su
In the past, on-site cabling was very simple. The sensor can be either power-supply or passive. The power supply type requires 2, 3, or 4 cables, and the passive type requires only 2 cables. At the same time, the sensors are both analog-type and support 12, 24, 36, 48VDC, or 110, 220VAC voltages. The field controller provides power for each sensor, and each sensor is connected to its related controller. Because the controllers are both analog-type, factory wiring is constantly increasing.
When a
Study on the application of Poe power supply (I.)
Introduction to Guan Jinssong PMP 2010-4-2 Poe
POE refers to the transmission of data signals to some ip-based terminals (such as IP telephones, wireless LAN access point APS, network cameras, etc.) while the existing Ethernet CAT.5 cabling infrastructure is not changed Ethernet It can also provide DC-powered tech
Poe refers to the transmission of data signals to a Poe based on IP terminals (such as IP telephones, wireless LAN access point APS, network cameras, etc.) while the existing Ethernet CAT.5 cabling infrastructure is not changed Ethernet It can also provide DC-powered technology for such equipment. Poe is also known as a LAN based power supply (PoL) or active Ethe
For us, what is the best product for us? Choosing a POE switch for the camera is the bigger the backplane bandwidth, the better? Below, we will help you solve the confusion of selecting Poe switches in the following three ways.One, suitable port, practical most importantMany friends in the choice of Poe switch the number of port, in fact, it is clear that their o
Poe switches are widely used, especially network monitoring and wireless coverage, because they can be powered by a network cable, subtract additional cabling, and make construction easier.In the Network Monitoring project, a monitoring system has a lot of network cameras, and some network cameras with infrared lights, so many friends think that Poe Switch power supply is larger, so the larger the choice. A
Switch port support output power up to 15.4W, in line with the IEEE802.3AF standard, through the network cable power to the standard Poe Terminal Equipment power supply, eliminates the additional power wiring. After research and development of the introduction of the IEEE802.3AT Standard Poe switch, the port output power can reach 25-30w. In layman's parlance, Poe
POE (power over Ethernet) refers to providing data transmission signals for switches, routes, and APS in the existing Ethernet structure without changing the structure, it can also provide DC power supply technology for such devices.
Poe has always been an expensive option, but this problem has recently changed with the emergence of simple Poe switches.
The f
(7) understand the module and injector in angular, that is, dependency injection and angularinjector.
The benefits of dependency injection (DI) are no longer described in detail. Anyone who has used the spring framework knows the benefits. Angularjs, as a front-end js framework, also provides DI support, which is a feature not available in javascript/jquery. In angularjs, there are DI-related angular. module (), angular.
Use several pieces of code to clarify the concepts and associations of $ injector, $ rootScope, and $ scope in angularJS.
$ Injector, $ rootScope, and $ scope are important in the angularJS framework. clarifying the relationship between them is very useful for us to learn and understand the angularJS framework in the future.
1,$ Injector is actually an IOC contai
AngularJS dependency injection instance analysis (using module and injector), angularjsinjector
This article analyzes the dependency injection of AngularJS. We will share this with you for your reference. The details are as follows:
The benefits of dependency injection (DI) are no longer described in detail. Anyone who has used the spring framework knows the benefits. AngularJS, as a front-end js framework, also provides DI support, which is a feature
$injector, $rootScope, and $scope are important things in the AngularJS framework, and it is useful for us to follow up on the AngularJS framework of learning and understanding.1.$injector is actually an IOC container that contains a lot of services (similar to beans in the spring framework), and other code can pass $injector. Get ("ServiceName") way, Get the ser
The benefits of dependency injection (DI) are no longer described in detail. Anyone who has used the Spring framework knows the benefits. Angularjs, as a front-end JS framework, also provides di support, which is a feature not available in Javascript/jquery. In angularjs, there are di-related angular. Module (), angular. injector (), $ injector, and $ provide. A di container must have three elements: Servic
(vii) Understand the module and injector in angular, that is, dependency injection time:2014-10-10 01:16:54 read:63060 Comments:1 Favorites:0 [Point I collection +] Tags: angular injector angular Dependency InjectionThe benefits of Dependency injection (DI) are no longer mentioned, as is known with the spring Framework. Angularjs, as the front-desk JS framework, also provides support for Di, a feature tha
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Inferred injection
Tagged injection
Inline-Injection
$injector Common methods
Sample code
There are also concepts of dependency injection in Angularjs, like dependency injection in spring, but different. There are some additional things you need to do to use construct injection or set value injection in spring, but it is convenient to just declare it where you need it, like a reference to a module
Angular. JS learning dependency injection $ injector details, angular. jsinjector
Preface
Before dependency injection (IoC), it is very simple and straightforward to create an Object in the program, that is, to create a new Object in the code, we create, maintain, modify, and delete objects on our own. That is to say, we control the entire lifecycle of objects until they are not referenced and recycled. It is true that this practice is understandable
Angular. JS learning-dependency injection $ injector
Before dependency injection (IoC), it is very simple and straightforward to create an Object in the program, that is, to create a new Object in the code, we create, maintain, modify, and delete objects on our own. That is to say, we control the entire lifecycle of objects until they are not referenced and recycled. It is true that this practice is understandable when the number of objects created o
, polluting the global namespace, and passing the reference through the function can also be done in two ways:
1, Closure package delivery
2, the background to resolve the dependent objects, and through Function.prototype.call the reference
In Angularjs, dependency injection is implemented through the latter, and the following sections will introduce the implementation of the IOC module.
Get dependencies
var Fn_args =/^function\s*[^\ (]*\ (\s* ([^\)]*) \)/m;
var fn_arg_split =/,/; Get
The benefits of Dependency injection (DI) are no longer to be mentioned, as is known with the spring Framework. Angularjs as the foreground JS frame. Support for Di is also provided. This is a feature that Javascript/jquery does not have.The Angularjs is related to di with Angular.module (), angular.injector (), NBSP; $injector, $provide object can be Applicationcontext.getbean () implemented; a dependency declaration, which can be configured in a
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