Users Guide

78 Switch Feature Overview
IEEE 802.3bt Capability
The Dell Networking N2224PX-ON/N2248PX-ON switches implement
802.3bt Type 3 power sourcing equipment capability. These switches are
capable of negotiating the capabilities with the powered device via LLDP.
IEEE 802.3bt support allows 2 pair class 0-4, 4 pair, class 0-4, and 4 pair class
5-6 power.
The N2200PX-ON switch implements IEEE 802.3bt Type 3 capability. There
are two modes of operation as determined by the power inline detection
configuration. These switches do not allow static management of the power
limit. The power inline limit and power inline management static
commands are deprecated on these models.
Configuring the switch with power inline detection dot3bt implements a
strictly compliant IEEE 802.3bt classification.
Configuring the switch with power inline detection dot3bt+legacy
implements the IEEE 802.3bt classification with the following differences for
4-pairs matrix (60W) operation. This mode is a special Type 3 802.3bt
compliant classification up to 60W, with the exception that Class 4
single-signature PD will be treated as Class 6 to support Class 4 60W (4 class
events will be generated). The maximum logical power is 60W. A
legacy-detected PD will be treated as a single signature PD. The special Class
4 single-signature PD will not be power demoted, that is, if power is not
available the port will not power up. Classes 7 and 8 are power demoted to
Class 6 under an insufficient power condition. Other classes will be power
demoted when power is not available, based on IEEE 802.3bt behavior. For
example, Classes 5 and 6 will be demoted to Class 4 30W under an
insufficient power condition. Any classification error will not be powered up.
Class 0 PDs are treated as 802.3bt Class 3.
PoE Port Capabilities and Power Limits
Table 2-1 identifies the PoE capabilities of each switch.