HP Power over Ethernet (PoE/PoE+) Planning and Implementation Guide

9-6

Planning and Implementation for the HP 2920-PoE+ Switches

Planning the PoE Configuration

Backup power (RPS) and extra PoE/PoE+ power can be provided by

connecting an HP 640 RPS/EPS Shelf to the switch. The same PoE+ power

supplies that you install in the HP 2920 Switches can be installed in the HP

640. For more information on the HP 640, see Table 9-2 on page 9-4 and Table

9-3 on page 9-4, and see the HP 640 RPS/EPS Shelf Installation and Power

Setup Guide, which can be found on the web site www.hp.com/networking/

support. Auto search on “640”, select the 640 from the list, click on Display

selected, and then click on the links that have the word “manuals” in them to

get to the manuals web page.Also see

HP 2920-24G-PoE+ Configurations

Figure 9-1. Example of an HP 2920-24G-PoE+ Switch

Note: PoE or PoE+ is not supplied to any of the SFP ports.

Any 12 of the 24 ports can be used, not just the first block of ports.

Any 23 of the 24 ports can be used.

HP 2920-24G-PoE+ Switch

575W PSU: Any 23 of the ports can receive up to

15.4 Watts of PoE+ power.

1050W PSU: Any 23 of the ports can receive up to

30 Watts of PoE+ power. See the table below

All 24 ports can receive up to

7.5 Watts of PoE+ power

575W PSU: Any 12 of the ports can

receive up to 30 Watts of PoE+ power

Source of Power Watts

Available

Number of Ports Powered

and Average Watts/Port

Internal 575W PoE+

Power Supply

370 12 @ average 30 W each

23 @ average 15.4 W each

24 @ average 7.5 W each

Internal 1050W PoE+

Power Supply

740 23 @ average 30 W each

24 @ average 15.4 W each

24 @ average 7.5 W each