User's Manual

How to Install the ISONAS IP-Enabled Reader-controller 13
PoE Power Budget Calculations
When planning an installation using PoE, you need to assure that the PoE source
(PoE Injector or PoE equipped Network Switch) supplying the PoE power is sized
properly for the power draw of all the doors. To do this, you total up the power draw
(in watts) of the PoE connections, and compare that total power draw to the rated
capacity of the PoE source.
Below is a chart of expected PoE power draws of the ISONAS Reader-controllers.
Door Location Configuration
PoE Power Requirement **
(Watts)
PowerNet Reader-Controller
3.0 Watts
PowerNet Reader-Controller with
Electronic Lock (0.6 amp @ 12V)
11.0 Watts
*** Ethernet cabling power losses not included. Losses range from being negligible
for short Cat5 cables up to about 16% for 100 meter Cat5 cables.
To meet the PowerNet’s variable PoE power requirements, the PowerNet will classify
itself with the PoE source as a “Class 0” PoE device. The power usage of a Class 0
device can range between 0.4 to 13.0 watts at the device (up to 15.4 watts from the
PoE source).
Some network PoE equipment will budget and allocate it’s distribution of PoE power
based upon the maximum power usage of the each attached device’s classification.
If your network equipment uses this power provisioning technique, then you should
budget 15.4 watts for each PowerNet. Such network PoE Equipment may allow you
to manually configure the amount of power that should be allocated to each device.
Configuring the PoE equipment for an allocation of 3.0 watts or 11.0 watts per
connection would be appropriate.
2.1.2: ADDITIONAL POWER OPTIONS
Most installations will use PoE for the PowerNet and door locks.
That is a clean way to control a door using a single, standard network cable.
There are many additional options available, that can be used, if the door location
requires more power than a standard PoE-powered PowerNet can provide.
The different options require different configurations of the supporting equipment
and /or building wiring. The following chart and Figure 4 describes some of these
power options.