TP-LINK ADSL2+ Ethernet/USB Modem Router (Annex B). DSL connection type: ADSL, Upstream data rate: 3.5 Mbit/s, Downstream data rate: 24 Mbit/s. Networking standards: 802.1p, IEEE 802.1d. Routing protocols: ARP, DDNS, DNS, IP, NAPT, TCP, UDP, Supported network protocols: PPPoE, RFC 2364. Firewall security: NAT, Filtering: IP, VPN support: IPSec/PPTP/L2TP. Operating temperature range (T-T): 0 - 40 °C, Storage temperature range (T-T): -40 - 70 °C, Operating relative humidity range: 10 - 90 %