PoE Detection Types

The following table identifies product support for the different PoE types.

Table 1. PoE type support
Product	Highest PoE Standard
VSP4900-12MXU-12XE	802.3bt Type 3 PoE (60W)
VSP4900-48P	802.3at Type 2 PoE (30W)

The global configured detection type specifies the following versions of the IEEE standard to support. Standards are arranged from oldest (top) to newest (bottom).


Detection Type	Power Mode
802.3af	Normal
802.3af and legacy	Normal
802.3at	High
802.3at and legacy	High
802.3bt type 3	Normal
802.3bt type 4	Normal
802.3bt and legacy	Normal

The default detection type is automatically configured for the highest PoE standard supported on the switch.

Note

802.3at is backwards compatible with 802.3af. Therefore, both normal power and high power devices are supported in this mode.

Changing from a newer IEEE standard to an older IEEE standard is permitted, however power delivery is interrupted during this operation, and all PoE devices are reset. There is no service interruption when changing from an older IEEE standard to a newer IEEE standard.