The D-Link DSL-2890AL rev A1 router has Gigabit WiFi, 4 Gigabit ETH-ports and 0 USB-ports.
How to hard reset (factory reset) D-Link DSL-2890AL rev A1 :
You can hard reset your D-Link DSL-2890AL rev A1 with ways bellow
With the reset button
Locate the reset button on the back off the router
While the unit is powered on, press the reset button with a sharp object (e.g. paperclip)
Hold the button pressed for 10 seconds, then release.
The unit will reboot by itself and once the WLAN light stops blinking the factory reset is done.
You can now setup your router again through the user interface
D-Link DSL-2890AL rev A1 default Login & Password, factory settings :
If you have performed a reset of your DSL-2890AL rev A1 device or not changed the defaults, you
be able to access it with the following settings
Default subnet mask: 255.255.255.0
D-Link DSL-2890AL rev A1 router specifications :
Custom firmwares: None
WiFi: Gigabit (abgn+ac)
WiFi throughput: n/a
4 x Gigabit ports