Will it harm a non-POE device into a POE port?

In short, no. The switch will send a very low-voltage signal to whatever you plug into it (not enough to harm the device). The amount of current drawn by the plugged-in device allows the switch to determine if the device is PoE/non-PoE. If the device draws no power, the switch will not send through additional voltage. If the device does draw power, the PoE switch will take additional steps to determine how much current to send to power the device. Unplugging and re-plugging the device starts this process over again.

Can two POE switches be stacked to double the number of ports?

The answer is yes, kind of if you "stack" them or daisy chain them together you will have more POE ports. That said it will no be double as you need a port to stack or daisy chain them together so the devices can talk to each other or you can communicate with and configure the POE devices if needed. with the 8 Port 4 Port POE you could get 8 Ports POE and use a non POE port to connect them to each other or to a main switch.

Will 1 port put out more than 15.4 W if only one port is used?

No, That is the max amount any port together or singularly will provide power. If it wasn't regulated it could would destroy equipment plugged into it.

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NETGEAR 8-Port Gigabit Ethernet Unmanaged Switch, 4xPoE (GS308P)

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8 auto-sensing Gigabit Ethernet ports with 4 PoE 802.3af ports (Ports 1-4)
Power-Over-Ethernet (PoE) Ports provide data and power up to 15.4W per port (up to 53W total PoE power across all PoE connected devices) on a single CAT5 (or better) cable
Plug-and-Play auto connect to router and modem using any port
Durable and rugged metal case with fanless design for silent operation
Ideal for small office and home networks
Energy-efficient technology for power savings
LED indicators for PoE power and link/activity for ease of use

Overview

Specs

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Model
Brand	NETGEAR
Model	GS308P-100NAS

Format & Standards
Format	Desktop or Wall-mountable
Standards	802.3ab 1000BASE-T Gigabit Ethernet 802.3u 100BASE-TX Fast Ethernet 802.3i 10BASE-T Ethernet 802.3x Flow Control 802.1p Priority QoS (all models) 802.1p Priority QoS and Honors DSCP tags (GS305, GS308) 802.3 CSMA / CD 802.3az Energy Efficient Ethernet
Network Management Type	Unmanaged

Ports & Interface
Primary Ports	8 x RJ45
Primary Port Speed	10/100/1000Mbps

Data Transmission
MAC Address Table	4K
Jumbo Frames	9720 bytes

Details
Buffer Memory	192KB
PoE	Yes
Power	DC Input: 48V / 1.25A Power Consumption (Max and Standby): 60.0W / 0.28W

Features
Features	Auto-MDI / MDIX eliminates the need for crossover cables LED indicators for ease of use Energy-efficient technology for power savings Fanless design for silent operation Auto-negotiation for automatic connection at the highest common speed between switch and an end device Non-blocking switching architecture for maximum throughput at wire speed Plug-and-play Durable and rugged metal case Desktop or wall-mountable Ideal for small office and home networks Power up to 4 PoE-capable devices (15.4W per device up to 53W total PoE power) (GS308P only) 802.3af Power Over Ethernet (PoE) for IP cameras, VOIP phones, wireless access points (GS308P only)

Dimensions & Weight
Dimensions	1.14" x 6.22" x 3.98"
Weight	1.01 lbs.

Environmental
Temperature	Operating Temperature: 0 ~ 40 °C Storage Temperature: -20 ~ 70 °C
Humidity	Operating Humidity: 90% maximum relative humidity, non-condensing Storage Humidity: 5% to 95% relative humidity

Packaging
Package Contents	8-Port Gigabit Ethernet Switch with 4-Port PoE (GS308P) Power Adapter Quick Installation Guide Wall-mount kit

Additional Information
First Listed on Newegg	November 02, 2015

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Warranty

Limited Warranty period (parts): 3 years
Limited Warranty period (labor): 3 years
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Return for refund within: 30 days
Return for replacement within: 30 days
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NETGEAR 8-Port Gigabit Ethernet Unmanaged Switch, 4xPoE (GS308P)

Learn more about the Netgear Inc. GS308P-100NAS

Customer Reviews of the Netgear Inc. GS308P-100NAS

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16833122817

NETGEAR 8-Port Gigabit Ethernet Unmanaged Switch, 4xPoE (GS308P)

Learn more about the Netgear Inc. GS308P-100NAS

Customer Reviews of the Netgear Inc. GS308P-100NAS

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info