Question 1

What is the difference between the 300 and 500.

Accepted Answer

The difference relates to the data transfer rate over the local link, the higher speeds would be useful if you were transferring a lot of data over your local network, such as transferring files between devices, notice I say local and not internet, if you're just using it to access the internet from a mobile then you don't need the 500.

Question 2

How do you use this with Ethernet cable for one device and as a wifi extender as well in a wifi dead spot area?

Accepted Answer

I have the main unit cabled into the router in the lounge. The second unit is set up in the Loft/Office with the main PC and NAS box cabled into the ethernet ports, the works laptop use the wireless connection. I used to have a very weak signal in the bedrooms before, but now they have a very good signal. Once you have syncronised the second unit to the main unit everything is automatic. Hope that helps.

Question 3

can additional extenders be added? So one base unit wired to the router, and have several extenders throughout the house?

Accepted Answer

Where do you purchase an additional homeplug? I need one more but don't really want the kit as I have the base unit already.

Question 4

Can you connect other version's of a tp link powerline adapter to these?

Accepted Answer

You can, but with caveats. I had a pair of existing 2,000mbps 2 port plugs set up (TL-PA9020PKIT). One next to my router, the other in my office. They work great, and I had full 2,000mbps speeds. 
I bought this kit to extend wifi up to the loft and out to the garden, not really fully realising there was a non-wifi master, and a secondary wifi slave. So there is only one Wifi extender in this pack (TL-WPA7510KIT)

It took me a few attempts, but I have now managed to get all 4 sharing my single network across 4 rooms. The trick seemed to be pairing them in a string sequence, not all to the first one in the router. 
So I had the first non wifi one plugged into the router, paired with my other non-wifi one. Then I paired that second one with the new master of the wifi kit (which is just a single port 1,000mbps , no wifi). Then I paired THAT one with the wifi extender one. Finally, I cloned my wifi settings on that last one.

The downside is that my 2,000 network is now running at 1,000 because it all has to go at the speed of the slowest part in the network. 
And the wifi is only extended towards the garden, not towards the loft, because only one half of the TL-WPA7510KIT is actually broadcasting wifi.

Otherwise it's pretty plug n play. I seem to have to re-pair them after they've lost power. But now I have the knack, it's simple.

ASIN	B09MFY49L5
Best Sellers Rank	1,188 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 7 in Powerline Network Adapters
Box Contents	TL-WPA7617
Brand Name	TP-Link
Color	White
Compatible Devices	Desktop
Compatible Operating System Family	Windows
Country of Origin	China
Customer Reviews	3.9 3.9 out of 5 stars (166)
Data Link Protocol	Gigabit Ethernet
Data Transfer Rate	1000 Megabits Per Second
EU Spare Part Availability Duration	3 Years
Hardware Interface	Ethernet
Item Dimensions L x W x H	6.9L x 6.5W x 12.4H centimetres
Item Weight	410 Grams
Manufacturer	TP-Link
Manufacturer Part Number	TL-WPA7617
Model Number	TL-WPA7617
Number of Items	1
Number of Packs	1
Product Warranty	3 year Manufacturer

TP-Link TL-WPA7617 AV1000 Gigabit Passthrough Powerline Adapter Kit, Dual-Band WiFi Booster Speed up to 1200 Mbps, One-Touch Wi-Fi Configuration, Auto-Sync, 4K Streaming, No Configuration Required

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