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

11-4
Planning and Implementation for the HP 3500-PoE yl Switches
PoE Provisioning
PoE Provisioning
HP 3500-PoE yl Switches
■ The HP 3500-24G-PoE yl Switch can supply up to 398 watts of PoE power
across ports 1-24 for PoE applications compatible with the IEEE 802.3af
standard.
■ The HP 3500-48G-PoE yl Switch can supply up to 398 watts of PoE power
across ports 1-48 for PoE applications compatible with the IEEE 802.3af
standard. This reduces the average per port wattage by half as compared
to the HP 3500-24G-PoE yl Switch.
An external power supply, the 620 RPS/EPS (J8696A) can be connected to
either of the 3500-PoE yl Switches to provide redundant or extra PoE power.
The 620 RPS/EPS can be connected to up to two switches and provide 388
watts of 50V power to each switch.
Table 11-1. PoE Power Provisioning for the 3500-PoE yl Switches
Note There is a special power provision on the 3500-48G-PoE yl Switch. This 48-
port switch reserves 22 watts for each bank of 24 ports, ports 1-24 and 25-48,
so that neither set of ports receives the entire 398 watts. This is designed for
the integrity and safety of PoE during power balancing to properly detect PDs
and bring them online.
PoE Devices Internal Only Internal and External External Only
PoE for 3500-24G-
PoE yl Switch
398 watts available to
ports 1-24.
398 watts available to ports 1-24
(provided by the internal source).
388 watts available as backup in
case of failure, provided by the
external source.
If the switch’s internal power
supply has failed, the external
source provides 388 watts to ports
1-24.
PoE for 3500-48G-
PoE yl Switch
398 watts available to
ports 1-48.
786 watts available to ports 1-48
(provided by both the internal and
external sources).
If the switch’s internal power
supply has failed, the external
source provides 388 watts to ports
1-48. Note that a minimum of 22
watts will always be allocated to
both port groups (ports 1-24 and
ports 25-48).