tp-link tl-wr840n подходит для ADSL?

Нет, для подключения через DSL нужен RJ-11 порт. А у вас только RJ-45 порты. Другое дело, если у вас уже есть DSL модем. К его выходу ваш роутер подключить можно.

нет. это обычный роутер

после адсль модэма провайдэра его только поставить хотя брать нужно со сьемными антенами
4 10/100Mbps LAN PORTS
1 10/100Mbps WAN PORT
Button WPS/Reset Button
Wireless On/Off Button
Power On/Off Button
External Power Supply 9VDC / 0.6A
Wireless Standards IEEE 802.11n, IEEE 802.11g, IEEE 802.11b
Antenna 2 Internal Antennas
Dimensions ( W x D x H ) 7.2 x 5.0 x 1.4in.(182 x 128 x 35 mm)
WIRELESS FEATURES
Frequency 2.4-2.4835GHz
Signal Rate 11n: Up to 300Mbps(dynamic)
11g: Up to 54Mbps(dynamic)
11b: Up to 11Mbps(dynamic)
Reception Sensitivity 270M: -68dBm@10% PER
130M: -68dBm@10% PER
108M: -68dBm@10% PER
54M: -68dBm@10% PER
11M: -85dBm@8% PER
6M: -88dBm@10% PER
1M: -90dBm@8% PER
Transmit Power CE:
<20dBm(2.4GHz)
FCC:
<30dBm
Wireless Functions Enable/Disable Wireless Radio, WDS Bridge, WMM, Wireless Statistics
Wireless Security 64/128-bit WEP, WPA / WPA2,WPA-PSK / WPA2-PSK
SOFTWARE FEATURES
WAN Type Dynamic IP/Static IP/PPPoE/
PPTP/L2TP
DHCP Server, Client, DHCP Client List,
Address Reservation
Quality of Service WMM, Bandwidth Control
Port Forwarding Virtual Server,Port Triggering, UPnP, DMZ
Dynamic DNS DynDns, Comexe, NO-IP
VPN Pass-Through PPTP, L2TP, IPSec (ESP Head)
Access Control Parental Control, Local Management Control, Host List, Access Schedule, Rule Management
Firewall Security DoS, SPI Firewall
IP Address Filter/MAC Address Filter/Domain Filter
IP and MAC Address Binding
Management Access Control
Local Management
Remote Management
OTHERS
Certification CE, FCC, RoHS
Package Contents Wireless N Router TL-WR840N
Power supply unit
Resource CD
Ethernet Cable
Quick Installation Guide
System Requirements Windows 2000/XP/Vista™, Windows 7, Windows 8 or Mac OS or Linux-based operating system
Environment Operating Temperature: 0℃~40℃ (32℉~104℉)
Storage Temperature: -40℃~70℃ (-40℉~158℉)
Operating Humidity: 10%~90% non-condensing
Storage Humidity: 5%~90% non-condensing