PoE Detection Types

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

Table 1. PoE type support
Product Highest PoE Standard

5520-12MW-36W

802.3bt Type 4 PoE (90W)

5520-24W

802.3bt Type 4 PoE (90W)

5520-48W

802.3bt Type 4 PoE (90W)

VSP 4450GSX-PWR+

802.3at Type 2 PoE (30W)

VSP 4450GTX-HT-PWR+

802.3at Type 2 PoE (30W)

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

By default, 802.3at (including legacy) is the POE PD detection type. In this high power mode, Class 4 PDs receive up to 32 watts of power.

Note

Note

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

802.3af (maximum 15.4 W) and 802.3at (maximum 25.5W) are the older standards.

Note

Note

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.