Table of Contents
Advertisement
8-port Ultra60 PoE++ Multi-Gigabit (2.5G) Ethernet Smart Switch Hardware Installation Guide
PoE++ and PoE+ overview
The switch provides PoE++ and PoE+ ports:
• PoE++ ports: The PoE++ ports (1–4) support IEEE 802.3bt. These ports are also
compatible with PoE+ (IEEE 802.3at) and PoE (IEEE 802.3af) and can support non-PoE
devices. The maximum PoE power that an individual PoE++ port can supply is 60W.
• PoE+ ports: The PoE+ ports (5–8) support IEEE 802.3at. These ports are also
compatible with PoE (IEEE 802.3af) and can support non-PoE devices. The maximum
PoE power that an individual PoE+ port can supply is 30W.
The PoE++ and PoE+ power supplied by the switch is prioritized in ascending port
order (from port 1 to port 8), with a total power budget of 230W across all active PoE++
and PoE+ ports. If the power requirements for attached powered devices (PDs) exceed
the total power budget of the switch, the PoE power to the device on port 8 (and, if
necessary, on port 7 too) is disabled to make sure that the devices connected to the
higher-priority, lower-numbered PoE ports are supported first.
Although a device might be listed as an 802.3bt PoE++-powered or 802.3at
PoE+-powered device, it might not require the maximum power limit that is specified
by its IEEE standard. Many devices require less power, allowing all 8 PoE ports to be
active simultaneously when the devices correctly report their PoE class to the switch.
The following table shows the standard power ranges, calculated with the maximum
cable length of 328 feet (100 meters). If a device receives insufficient PoE power from
the switch, consider using a shorter cable.
Table 2. PoE classes and PoE power allocations
Device
Compatible PoE
Class
Standard
0
PoE, PoE+, and
PoE++
1
PoE, PoE+, and
PoE++
2
PoE, PoE+, and
PoE++
3
PoE, PoE+, and
PoE++
4
PoE+ and PoE++
Applications
Class Description
Maximum Power
Supplied by the
Switch
Default power (full)
15.4W
Very low power
4.0W
Low power
7.0W
Mid power
15.4W
High power
30.0W
18
Power Delivered to
Supported
the Device
on Ports
0.44W–13.0W
Ports 1–8
0.44W–3.84W
Ports 1–8
3.84W–6.49W
Ports 1–8
6.49W–13.0W
Ports 1–8
13.0W–25.5W
Ports 1–8
Hardware Installation Guide
Advertisement
Table of Contents
