From wikipedia:
Passive POE
The common 100 Mbit/s passive applications use the pinout of 802.3af mode B - with DC plus on pins 4 and 5 and DC minus on 7 and 8 (see chart below) and data on 1-2 and 3-6. Gigabit passive injectors use a transformer on the data pins to allow power and data to share the cable and is typically compatible with 802.3af Mode A. In the common "passive" PoE system, the injector does not communicate with the powered device to negotiate its voltage or wattage requirements, but merely supplies power at all times. Passive midspan injectors up to 12 ports simplify installations.
Devices needing 5 Volts cannot typically use PoE at 5 V on Ethernet cable beyond short distances (about 15 feet (4.6 m)) as the voltage drop of the cable becomes too significant, so a 24 V or 48 V to 5 V DC-DC converter is required at the remote end.
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Passive PoE power sources are commonly used with a variety of indoor and outdoor wireless radio equipment, most commonly from Motorola (now Cambium),
Ubiquiti Networks,
MikroTik and others. Earlier versions of passive PoE 24VDC power sources shipped with 802.11a, 802.11g and 802.11n based radios are commonly 100 Mbit/s only. Specifications vary by manufacturer and model, but some of the common specifications include:[
citation needed]
- 24VDC 0.5A 100 Mbit/s or 1 Gbit/s
- 24VDC 1.0A 100 Mbit/s or 1 Gbit/s
- 48VDC 1.0A 100 Mbit/s or 1 Gbit/s
- 56VDC 1.0A and 2.0A 1 Gbit/s (used for 45W+ load point to point microwave and millimeter band radios)
Passive DC-to-DC injectors also exist which convert a 9 V to 36 V DC, or 36 V to 72 V DC power source to a stabilized 24 V 1 A, 48 V 0.5 A, or up to 48V 2.0A PoE feed with '+' on pins 4 & 5 and '−' on pins 7 & 8. These DC-to-DC PoE injectors are used in various telecom applications.
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versus
The original
IEEE 802.3af-2003[1] PoE standard provides up to 15.4 W of
DC power (minimum 44 V DC and 350 mA
[2][3]) on each port.
[4] Only 12.95 W is assured to be available at the powered device as some power dissipates in the cable.
[5] The updated
IEEE 802.3at-2009[6] PoE standard also known as
PoE+ or
PoE plus, provides up to 25.5 W of power for Type 2 devices.
[7] The 2009 standard prohibits a powered device from using all four pairs for power.
[8] Both of these standards have since been incorporated into the
IEEE 802.3-2012 publication.
[9]
So if I was you, if it is stated to be dangerous, I wouldn't put the new VTO on the VTNS.