Just Cable between the Switch and POE Adapter The most reliable solution is the cable without daisy chain any active devices. 1500ft PoE+ Switch doesn't require PoE extenders in the middle. It is only the PoE adapter at the edge for return the signal over ultra-long distance. What you need to bury underground now is just the cable. Only Works with PoE/PoE+ Devices The 1500ft Long Range PoE+ Switch works with standard IEEE802.3 PoE/PoE+ IP devices only. The system will not work while your devices are passive PoE or non-PoE equipment. The switch needs to perform power handshake with your devices before it starts working. Using Pure Copper Ethernet Cable One of the tricky things to extend the PoE is the power loss inline. There is always PoE loss during the transmission. The longer the distance, the more power loss will occur. You should pick the pure copper Ethernet cable instead of the CCA type. Technical Specifications PoE Standard IEEE 802.3af, IEEE 802.3at, IEEE 802.3bt, Legacy Bt, UPoE Networking Interfaces (8) 10/100 Mbps PoE Ports (2) 10/100/1000 Mbps uplink Ports PoE Port 1-8 (Only ports #1- #4 support 800m long-distance PoE, extra POE adapter for the other two long range ports are sold separately.) PoE Total 120W Power Supply 125W Max. Power Port (port #1-#4) 30.28W (328ft), 26.58W (984ft), 23.46W (1648ft), 17.56W (2500ft) Indicator PWR、 LNK/ACT、 PoE Network media (port #1-#4) 100BASE-T: UTP category 3,4,5 cable（0≤500m） 10BASE-TX: UTP category 5, 5e cable（500≤800m） Bandwidth 5.6Gbps Surge Protection Differential mode±2KV，Common mode ±6KV 8-Port Long Range PoE+ Switch 4-Port Long Range PoE+ Switch Waterproof PoE Extender Waterproof Ethernet Cable Extension Coupler Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 5.0 out of 5 stars 1 3.8 out of 5 stars 3 4.1 out of 5 stars 102 5.0 out of 5 stars 8 Price $249.56$249.56 $146.32$146.32 $69.99$69.99 $18.54$18.54 PoE Standard IEEE802.3bt/at IEEE802.3bt/at 802.3af/at/bt no data PoE Budget 120W 60W 60W no data Network Speed 10/100 Mbps 10/100 Mbps 10/100/ Mbps no data Surge Protection Differential mode±2KV, Common mode±6KV Differential mode±2KV, Common mode±6KV Differential mode±2KV, Common mode±4KV no data Wall Mount ✓ ✓ no data no data Waterproof Rating no data no data IP67 IP68 Operating Temperature -0°C ~ 40 °C -0°C ~ 40 °C -10°C ~ 55°C no data