| System requirements | |
| Mac compatibility | ![]() |
| Windows operating systems supported | Windows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 IOT Core, Windows 10 Pro, Windows 10 Pro x64, Windows 7, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 Home Premium, Windows 7 Home Premium x64, Windows 7 Professional, Windows 7 Professional x64, Windows 7 Starter, Windows 7 Starter x64, Windows 7 Ultimate, Windows 7 Ultimate x64, Windows 7 x64, Windows 8, Windows 8 Enterprise, Windows 8 Enterprise x64, Windows 8 Pro, Windows 8 Pro x64, Windows 8 x64, Windows 8.1 Enterprise, Windows 8.1 Enterprise x64, Windows 8.1 Pro, Windows 8.1 Pro x64, Windows 8.1 x64 |
| Mac operating systems supported | Mac OS X 10.1 Puma, Mac OS X 10.2 Jaguar, Mac OS X 10.3 Panther, Mac OS X 10.4 Tiger, Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion |
| Linux operating systems supported | ![]() |
| Ports & interfaces | |
| Ethernet LAN (RJ-45) ports | 2 |
| DC-in jack | ![]() |
| RJ-11 ports quantity | 1 |
| Memory card slot(s) | ![]() |
| USB port | ![]() |
| Weight & dimensions | |
| Weight | 440 g |
| Height | 200 mm |
| Width | 207 mm |
| Depth | 175 mm |
| Energy management | |
| Output voltage | 12 V |
| Output current | 1 A |
| Power source type | AC, DC |
| AC input frequency | 50 - 60 Hz |
| AC input voltage | 100 - 240 V |
| Operational conditions | |
| Operating relative humidity (H-H) | 50 - 90% |
| Storage temperature (T-T) | 0 - 70 °C |
| Operating temperature (T-T) | 0 - 40 °C |
| Storage relative humidity (H-H) | 20 - 90% |
| Protocols | |
| Management protocols | IGMP v1/v2/v3 |
| Supported network protocols | IPv4, IPv6 |
| Routing protocols | IPv4, IPv6 |
| DHCP client | ![]() |
| DHCP server | ![]() |
| Universal Plug and Play (UPnP) | ![]() |
| Networking | |
| Cabling technology | 10/100/1000Base-T(X) |
| Ethernet LAN | ![]() |
| Networking standards | IEEE 802.11a, IEEE 802.11ac, IEEE 802.11b, IEEE 802.11e, IEEE 802.11g, IEEE 802.11i, IEEE 802.11n, IEEE 802.3, IEEE 802.3u |
| VPN support | IPSec Pass-Through PPTP Pass-Through L2TP Pass-Through PPTP server OpenVPN server PPTP client L2TP client OpenVPN client |
| Ethernet LAN data rates | 10,100,1000 Mbit/s |
| Port forwarding | ![]() |
| Ethernet interface type | Gigabit Ethernet |
| Ethernet LAN interface type | Gigabit Ethernet |
| VPN Passthrough | ![]() |
| Port triggering | ![]() |
| Number of guest networks (2.4 GHz) | 3 |
| Packaging data | |
| Package type | Box |
| Security | |
| Security algorithms | 64-bit WEP, 128-bit WEP, WPA-Enterprise, WPA-PSK, WPA2-Enterprise, WPA2-PSK, WPS |
| Firewall security | Parental control |
| MAC address filtering | ![]() |
| System event log | ![]() |
| Parental control | ![]() |
| DMZ support | ![]() |
| IP address filtering | ![]() |
| Network address translation (NAT) | ![]() |
| Firewall | ![]() |
| URL filtering | ![]() |
| Guest access | ![]() |
| Port-based Network Access Control (PNAC) | ![]() |
| Filtering | ![]() |
| Stateful Packet Inspection (SPI) | ![]() |
| Wireless LAN features | |
| Wi-Fi standards | 802.11a, Wi-Fi 5 (802.11ac), 802.11b, 802.11g, Wi-Fi 4 (802.11n) |
| Wi-Fi | ![]() |
| Dual-band | ![]() |
| Wi-Fi band | Dual-band (2.4 GHz / 5 GHz) |
| WLAN data transfer rate (max) | 433 Mbit/s |
| WLAN data transfer rate (first band) | 300 Mbit/s |
| WLAN data transfer rate (second band) | 433 Mbit/s |
| Top Wi-Fi standard | Wi-Fi 5 (802.11ac) |
| DSL features | |
| ADSL | ![]() |
| ADSL2 | ![]() |
| ADSL2+ | ![]() |
| VDSL | ![]() |
| VDSL2 | ![]() |
| Management features | |
| Quality of Service (QoS) support | ![]() |
| Web-based management | ![]() |
| Reset button | ![]() |
| WPS push button | ![]() |
| Wi-Fi Multimedia (WMM)/(WME) | ![]() |
| Web-based setup wizard | ![]() |
| Packaging content | |
| AC adapter included | ![]() |
| Cables included | DSL, LAN (RJ-45), Phone (RJ-11) |
| Quick start guide | ![]() |
| Antenna | |
| Antenna type | External |
| Antennas quantity | 3 |
| Antenna design | External |
| Other features | |
| Bandwidth | 2.4 GHz |
| Connectivity technology | Wired & Wireless |
| Frequency band | 2.4 / 5 GHz |
| Compatible operating systems | Windows, Mac OS X, Linux |
| Frequency range | 2.4 - 5 GHz |
| Bandwidth (second) | 5 GHz |
| Bandwidth (first) | 2.4 GHz |
| Mobile network connection | ![]() |
| xDSL connection | ![]() |
| Design | |
| LED indicators | ADSL, DSL, LAN, Power, WLAN |
| Product colour | Black |
| Indication light | ![]() |
| Housing material | Acrylonitrile butadiene styrene (ABS) |
| On/off switch | ![]() |
| Product type | Tabletop router |
| Mobile networking | |
| 3G | ![]() |
| 4G | ![]() |
| Features | |
| Certification | CE |
| Plug and Play | ![]() |
| Firmware upgradeable | ![]() |
| WAN connection | |
| DSL WAN | ![]() |
| Ethernet WAN | ![]() |
| SIM card slot | ![]() |
| 3G/4G USB modem compatibility | ![]() |
| EAN | 4712900688108 |
| Warranty | 1 year |
The ASUS DSL-AC51 is a dual-band VDSL/ADSL modem router designed for home or small office networks. This device integrates a DSL modem with Wi-Fi 5 (802.11ac) technology, providing combined wireless speeds of up to 733 Mbit/s. It operates at 433 Mbit/s on the 5 GHz band and 300 Mbit/s on the 2.4 GHz band. The router supports VDSL2, ADSL2+, and standard ADSL connections via an RJ11 port. An Ethernet WAN port also allows the device to function with external fibre or cable modems.
Two Gigabit Ethernet LAN ports provide wired connectivity for high-speed local devices. Three external antennas manage signal distribution across both frequency bands. Network security features include a stateful packet inspection (SPI) firewall and filtering for IP addresses, MAC addresses, and URLs. VPN capabilities include support for IPSec, PPTP, and L2TP pass-through, alongside built-in PPTP and OpenVPN server and client functions. Settings—including Quality of Service (QoS) and parental controls—are managed via a web-based interface. Front-facing LEDs indicate the status of the power, DSL, LAN, and wireless connections.
Key Features:- Dual-band Wi-Fi 5 (802.11ac) operation – Separate network traffic by using the 5 GHz band for streaming and the 2.4 GHz band for general browsing.
- Two Gigabit Ethernet (10/100/1000 Mbit/s) LAN ports – Connect wired devices, such as gaming consoles or computers, for stable data transfers without wireless interference.
- Multi-standard DSL support (VDSL2/ADSL2+/ADSL) – Compatible with a range of internet service providers using traditional copper-based telephone line infrastructure.
- Integrated VPN server and client – Access a home network remotely or encrypt outgoing traffic using PPTP or OpenVPN protocols without additional hardware.
- Parental control content filtering – Manage user access by restricting specific website URLs and monitoring network activity.
- Three external antennas – Dedicated signal paths help maintain connection stability and extend wireless coverage in multi-room environments.
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