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Power Over Ethernet (PoE)

    Introduction

     

    The main advantage of PoE for the Wi-Fi industry is the installation of remote or outside equipment without having to connect to AC power. Equipment can be installed without the need for an electrician. The use of PoE also eliminates the AC/DC connection as a path for surges into the equipment. In a wired network with a lot of remote nodes, PoE based switches or routers eliminate the need for large numbers of AC power supplies or the installation of new AC outlets at the remote nodes. 

    The new MK3 CSTimeclock boasts an option for Power over Ethernet. What this means is that it is possible to power a device without using an official power supply. The PoE enabled clock can be connected to a PoE switch or by utilizing a PoE injector.

     

    CONTENT

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    Configuration

    Below a MK3 CSTimeclock with PoE module (Enabled)

    TCI with POE.jpg

    Here jumpers P4 and P6 are connected. Allowing the 5V output of the PoE module to be connected to the clock. Required PoE module to operate without external power supply.

     

     

    Below a MK3 CSTimeclock without PoE module (Disabled)

    TCI without POE.jpg

    Here jumpers P4 & P6 are disconnected. A seperate 5V power supply is required. TCI board will be supplied without onboard PoE module.

     

    NB! Never connect Jumpers P4 & P6 and the 5V power supply at the same time.

    Injector

    Where a certified PoE injector is reauired, use only specification approved models. There are injectors, which supply a constant 48V DC voltage on the respective ethernet connection & 24W power rating. 

    Use a straight cat5/e cable when connecting hte clock to a injector or switch.

    Notes & Tips

    1. PoE at a Glance

    PoE offers stable network connectivity and significantly reduced installation costs by eliminating the need to extend electrical power to each respective installation point. Devices such as IP cameras, access points, and telephony solutions are more easily installed in remote locations using PoE. For your specific project needs, 

    2. Know Your Distances 

    PoE devices can be installed up to 100 meters from a given PoE switch or injector. If the installation point is further away, a common solution is to run a standard Ethernet connection to a PoE injector which is located within 100 meters of the device. The injector bridges the excessive distance between the PoE device and the given switch. Note that the injector requires a power outlet. 

    3. Unmanaged PoE / PoE+ Switches

    Unmanaged PoE+ switches automatically supply the appropriate amount of power to connected PoE and non-PoE devices. These plug and go solutions offer performance and value with no management capabilities. 

    4. PoE vs. PoE+

    A PoE+ switch (IEEE 802.3at standard) provides up to 30 Watts of power per port and will automatically supply only 15 watts to more common PoE devices. Standard PoE switches (IEEE 802.3af standard) however can only provide up to 15 Watts of power to a connected device. 

    Specifications

    Our clocks (With PoE module) require a voltage of between 24V – 53V with 48V being the recommended input. The injectors we sell are in fact 48V - 24W, which is suitably sufficient for our PoE module (Clock). Doing the math, our injectors supply an amperage of 500mA. However, the clock only requires 13W to operate. This means: @ 48V we will only require 270mA & @ 44V we would require 295mA.

     

    • So if the ports on the switch provide 15.4W each @ a voltage of 44V, that would equal a supplied amperage of 350mA.
    • If the ports on the switch provide 15.4W each @ a voltage of 48V, that would equal a supplied amperage of 320mA.

     

    So in essence one can deduce that the clocks will work on “15W” ports. 

    Page last modified 09:29, 7 Dec 2016 by Duaine CS TimeClock Documents > Hardware > Power Over Ethernet (PoE)

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