Instruction: Answer the given question using the supporting document.

Input:
Question: Can I plug it into a wired Ethernet port that is directly connected to the router? Or a switch connected through that same port?
Document: Just so people understand. This is an access point or a wireless switch. NOT a range extender this will not extend your wireless without an Ethernet cable connected to your current router. With that said. This thing was super ez to set up. no instructions needed. My house is prewired with cat5 so i was able to extend my network to a dead spot in my house.
I added this to my main D-Link router, DIR 655 and hand wired 30'  it to the center of a large home ,3k sq/ftwhat an amazing product,  Everyone in the home and TV ,get full wifi bandwidth,Smart beam is really amazing, tech.I can also plug my new wide screens TV in to the rear of this device  if I want.
Attach Ethernet cable to existing router and the DAP-1525 and done!I wasn't happy with the range extension. In fact, I saw no difference. However, what I did like was the ability to easily move the DAP-1525 to a central location of my house to make the coverage more uniform. I moved it to the attic. You basically need a place to plug it in and a hole in your roof to run the Ethernet cable.
My wireless router is in my office in the rear of my home. I wanted to boost the WiFi signal strength in the front of my home to use my laptop wireless and link my phone. I replaced a 4 port switch with this AP. Easy quick setup in minutes. Laptop was linked and  streaming HD video without pausing. Signal is excellent. Had a little trouble linking phone but found out it was my keystroke error. Called D-link support to find that out.
This was too slow for video. Now in the bedrooms, we get 26 and 4 speeds. Video is no problem. It is priced right, easy to use. Caution, it only works in AP mode meaning it broadcasts wireless signal to wireless devices or it only works in bridge mode meaning you can plug up to four devices into it. In AP mode, you have to have a cat5 cable plugged into the back and the other end of the cable has to be connected to your router.
It's ok, just that it's wireless range is very poor. I mean it will work ok if you are in the same room. The wired switch works great. I would rather buy this type of wireless devices with antennas, expecting better coverage.
Took me ten minutes to set up as an access point. I plugged in an ethernet cable from a switch to it, set it to 2.4 ap setting, and turned it on. I was able to add it to my network but I changed the 192.168.0.50 address to .51 in case I get another one. It gives me speeds of 35 mbps down and 5 up on my first floor.
I left out a hyphen in the wireless network key. My Bad. Great service. Knowledgeable tech. Great product.Had this now for 10 months. It works perfect. It is an wireless access point for my laptop and cell phones. I plug the DVR and Blue Ray in to the back as a switch. Fast and reliable. Still five stars.
The D-Link Wireless Dual Band Wi-Fi Gigabit Range Extender and Access Point is good at what it does...when it works. For background, the product comes capable of two modes, a range extender for wireless access, as a wired access point for additional peripheral devices (sort of like a glorified switch). Only one mode or the other is possible at a time.
I later found out that the DAP-1525 does not support the repeater mode (i.e. wireless to router and wireless to clients). It supports only Bridge mode (wireless to router and wired to clients) and the Booster mode that is AP mode (wired only to router and wireless to clients).
Answer: I have mine connected directly into my router - one of the eight ports.  I am not sure if it will work via a switch that is connected to the router - but I tend to believe it will because when you obtain this unit, you connect it directly to a laptop or desktop and set it up with an IP address and name and password for the wireless, and thus when you connect it in the location you desire, at that point, it is just another device on your network - so as long as it is wired, my "guess" is that it will work through the router directly or the switch connected to the router, but I have never tested that scenario.  Hope this helps a little.