The CRS112-8P-4S-IN switch can be powered either at 24 o 48V.
Il 48V is used, PoE output can also be configured @24V passive mode on selected ports, or all ports work in 48V (802.3af) mode?
Thank you,
Rgds
No, this product requires the type of PSU, that matches the required output Voltage
Hi,
From what I understood, if you use both sources simultaneously (28V and 48V), the switch should supply the equipment with the required voltage depending on the type of PoE: passive or active.
It has a field where you can set the voltage to: Auto, Low or High.
Normis can confirm whether it is so or not.
You can select the poe out voltage between low and high, for 24V and 48V..
From the wiki
https://wiki.mikrotik.com/wiki/Manual:PoE-Out#Models_with_selectable_voltage_output
Feature which allows to manually switch between two voltage outputs on PoE-Out ports. Will take effect only on PSE with switchable voltage modes (CRS112-8P-4S-IN, CRS328-24P-4S+RM).
Does this mean, if I power the Mikrotik Router with 48V, for example CRS112-8P-4S-IN, I can select in Router OS with Mode I need on a specific Port?
For example, I have one passive PoE AccesPoint working with 24v (Low Voltage) on one Ethernet port, an on the other point I can power a device with 802.3af 48V?
This would mean the router has an Step Down Converter built in - but I can’t believe that.
Or can I power it with two voltages 24/38V and then select between the two.
Would be nice to know exactly.
Brochure, available from product download page states:
CRS112-8P-4S-IN is equipped with 12 independent switching ports. 28 V 3.4 A power supply is already included
in the box. There is secondary DC jack on the back of the enclosure that supports 48-57 V power supply (not
included, can be purchased separately). CRS112-8P-4S-IN can power 802.3af/at devices if 48-57 V DC input is
used (unit will automatically detect and provide correct power to devices).
IMHO this implies that one has to use both power supplies to provide both PoE out voltage options. IMHO the text actually opens a question whether unit actually operates when only 48V power is supplied to it … I’d say it does but that it includes DC step-down converter from 48V to 5V (which seems to be customary voltage used to run computers of all kinds these days).