Question 1

Does the device block the ground on the second wall outlet?

Accepted Answer

If you plug the powerline adapter into the bottom outlet of a two outlet wall socket, the top outlet is still accessible including the ground, but it is very tight so it depends on what you would want to plug in.  You would still be able to plug in a standard computer power cable or the plug from a power strip.

Question 2

If I were to buy two sets of this product, would the encryption be the same?  Asking this another way: If I hook my router into just one, would the other 3 be good for hosts, or would I need a pair for each host?

Accepted Answer

The encryption can be the same for all them.  One connected to your router and the other three connected to your host systems.  I've even used other trendnet adapters with all of them connecting to the single adapter connected to my router.

Question 3

do the devices need to me on the the same 120 volt circuit?

Accepted Answer

No, it should work fine.

They MAY need to be on the same circuit breaker *box*, if you're setting it up somewhere that has more than one.  It depends on whether there are noise filters installed between the different breaker boxes.

Question 4

Is this compatible with TRENDNet TPL-303E (200Mbps) adapters?  (ideally without any manual configuration).

I already have a pair of -303E's, and I would like to add one extra outlet (plus have a spare).

More generally, which other TRENDnet powerline adapters is this compatible with?

Accepted Answer

Yes, but I had some wieRd latency issues and went ahead and upgraded all mine to 500mbps and they went away.  I suggest you try it and if you get the same issues, upgRade your others.  This might have just been my issues.

Question 5

So there was only one review that stated 187mbps.  My question is that it says 500mbps, does that mean 250mbps both ways?  Or 500 down and 500 up?

Accepted Answer

I'm not impressed.  I bought 4 hoping to increase my speed for the two computers in the far corner of the house from my router and found that the wireless-N was still twice as fast checking a speed test website, and I'm not even approaching 500mbps.  I achieve 20Mbps with my wireless and only 11Mbps with these TRENDnets.  
I was extremely disappointed.

Brand	TRENDnet
Model	TPL-407E2K

Standards	IEEE 802.3 IEEE 802.3u IEEE 802.3x IEEE 1901 / HomePlug AV HomePlug 1.0
Interface	Ethernet port Sync / reset button Status LEDs Power plug
Encryption	128-bit AES Encryption
Ports	1 x 10/100 Mbps Auto-MDIX RJ-45 port
LEDs	Power (PWR) Powerline (PL) Connection Ethernet (ETH) Connection
Certifications	CE, FCC
Powerline Speeds	Up to 500Mbps
Connection Type	RJ45
Connection Speeds	10/100M
Kit Type	Double
Frequency Band	2 ~ 68 MHz
Power Supply	100~250V AC, 50~60Hz
System Requirement	Windows® 10, 8.1, 8, 7, Vista, XP

Dimensions	112 x 68 x 40 mm (4.4 x 2.7 x 1.1 in.)
Weight	3.6 oz.

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TRENDnet Powerline 500 AV Nano Adapter Kit With Built-In Outlet, Power Outlet Pass-Through, Includes 2 x TPL-407E Adapters, Plug & Play, Ideal For Smart TVs, Gaming, White, TPL-407E2K

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Item#: 9SIAHFE86U1277