Power Supply Configuration - Huawei S2720 Series Hardware Description

S2720&S2750 Series Ethernet Switches
Hardware Description
Figure 2-9 JTAG port

2.3.5 Power Supply Configuration

PoE Power Supply Configuration
In the S2720&S2750 series, the S2750-20TP-PWR-EI-AC, S2750-28TP-PWR-EI-AC, and
S2751-28TP-PWR-EI-AC are PoE models. All the three models use an internal AC power
module. The internal power module of the S2750-20TP-PWR-EI-AC provides 370 W of PoE
power, sufficient for full PoE power supply (IEEE 802.3af) on 16 ports and full PoE+ power
supply (IEEE 802.3at) on 12 ports. The internal power module of the S2750-28TP-PWR-EI-AC
provides 370 W of PoE power, sufficient for full PoE power supply (IEEE 802.3af) on 24 ports
and full PoE+ power supply (IEEE 802.3at) on 12 ports. The internal power module of the
S2751-28TP-PWR-EI-AC provides 124 W of PoE power, sufficient for full PoE power supply
on 8 ports and full PoE+ power supply on 4 ports.
Figure 2-10
transmitted to the PWR module on the switch, the PWR module provides a channel of 12 V
voltage and a channel of -53 V voltage. The 12 V voltage is provided for the entire device, and
the -53 V voltage is provided for the PDs.
Issue 08 (2015-02-12)
shows the PoE power supply connections on the switches. After AC power is
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