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ASUS DSL N55U Review | 77 Data compared

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  • Avg. price in UK: ~£95
  • Avg. price in US: ~$110
  • Wi-Fi version: Wi-Fi 4 (802.11n)
  • Wi-Fi speed: 600 Mbps
  • LAN port speeds: 1 Gbps
  • Wireless coverage: ?

ASUS DSL N55U review. Compare 77 technical specifications and user reviews to see how it ranks among routers and if it is worth buying.

7.1

Overall score

What it is: An overall evaluation of the router's quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best routers on the market.

Score components:

90.0%

6.9

Technical Score

10.0%

9.0

User score

Very good
6.9

Technical Score

What it is: An assessment of the router's technical performance, covering key areas such as Wi-Fi performance, wired connectivity, security, software features, coverage, and design.

When it matters: When you want to compare routers based on technical performance and available features.

Score components:

26.0%

5.2

Wireless

20.0%

6.3

Ports

18.0%

9.8

Networking

14.0%

9.1

Security

12.0%

4.8

Hardware

10.0%

6.3

Management

Good
9.0

User score

What it is: A rating that combines user reviews and the total number of reviews received by the router.

When it matters: When you want to know how a router performs in daily use and how reliable it is for speed, coverage, and stability according to user feedback.

Score components:

70.0%

8.6

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
3.5
(245)
United States
Amazon_logo.png
4.4
(1705)

(Reviews last updated: May 2026)

Exceptional
  • 4.3
    Gaming

    Score components:

    33.0%

    1.8

    Wi-Fi speed

    28.0%

    5.4

    CPU clock speed

    22.0%

    3.0

    RAM capacity

    17.0%

    9.0

    Maximum connected devices

  • 4.9
    Travel

    Score components:

    40.0%

    8.8

    Weight

    30.0%

    1.8

    Wi-Fi speed

    20.0%

    4.0

    Cellular modem type

    10.0%

    1.0

    SIM slot

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Best prices in UK

Best rankings

?

Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The ASUS DSL-N55U is an N600 dual-band ADSL2+ modem router featuring simultaneous 2.4GHz and 5GHz wireless bands with a combined theoretical bandwidth of 600Mbps and three detachable 2dBi external antennas. Key hardware includes two independent CPUs for dedicated modem and router processing, four Gigabit Ethernet LAN ports, and two multi-functional USB 2.0 ports that support printer sharing, 3G/4G dongle backup, and DLNA media streaming. Main pros include its 'true two-in-one' design that eliminates the need for a separate modem, high-capacity support for up to 300,000 data sessions, and an intuitive ASUSWRT dashboard for easy setup. However, notable cons include its lack of advanced wireless repeating functions, limited category-based parental filtering, and reports from some users regarding occasional wireless stability or connection drop-outs.

Technical Specifications of router ASUS DSL N55U

Technical Score

What it is: An assessment of the router's technical performance, covering key areas such as Wi-Fi performance, wired connectivity, security, software features, coverage, and design.

When it matters: When you want to compare routers based on technical performance and available features.

Score components:

26.0%

5.2

Wireless

20.0%

6.3

Ports

18.0%

9.8

Networking

14.0%

9.1

Security

12.0%

4.8

Hardware

10.0%

6.3

Management

6.9
ASUS DSL N55U has a technical score of 6.86 points, which is higher than that of 58.1% of products in this category.
User score

What it is: A rating that combines user reviews and the total number of reviews received by the router.

When it matters: When you want to know how a router performs in daily use and how reliable it is for speed, coverage, and stability according to user feedback.

Score components:

70.0%

8.6

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
3.5
(245)
United States
Amazon_logo.png
4.4
(1705)

(Reviews last updated: May 2026)

9.0
ASUS DSL N55U has a user score of 9 points, which is higher than that of 84.3% of products in this category.
Popularity
What it is: An indicator based on the number of reviews received by the router.
When it matters: When you prefer to choose a router reviewed and selected by many other buyers.
10
ASUS DSL N55U has a popularity of 10 points, which is higher than 63.5% of products in this category.
Ratio quality/price

What it is: An indicator that combines the router's overall rating with its cost.

When it matters: When you are looking for a router with a good balance between network performance, features, and price.

Score components:

60.0%

7.1

Overall score

40.0%

10

Price

7.9
ASUS DSL N55U has a quality-to-price ratio of 7.9 points, which is higher than 61% of products in this category.
Brand name
What it is: The manufacturer or brand of the product.
When it matters: When you prefer a specific ecosystem, support network, or design philosophy.

Importance: MEDIUM

Asus
Wi-Fi version
What it is: Identifies the Wi-Fi generation the router supports, such as Wi-Fi 5, 6, 6E, or 7.
When it matters: When newer phones, laptops, and consoles need the latest Wi-Fi efficiency and speed features.

Importance: HIGH

Good value: Wi-Fi 6 (802.11ax)

Wi-Fi 4 (802.11n)
ASUS DSL N55U uses Wi-Fi Wi-Fi 4 (802.11n). 60.8% of routers use a newer Wi-Fi standard.
Wi-Fi bands
What it is: Lists which wireless frequency bands the router can use, such as 2.4 GHz, 5 GHz, or 6 GHz.
When it matters: When you need to balance range, speed, and congestion across different types of client devices.

Importance: HIGH

Good value: 2.4 GHz + 5 GHz

2.4 GHz + 5 GHz
ASUS DSL N55U supports 2.4 GHz + 5 GHz Wi-Fi bands. 25% of routers use the same band setup.
Wi-Fi speed
What it is: The advertised maximum wireless throughput rating of the router under supported conditions.
When it matters: When several users stream, download, and game at once and you want more wireless headroom.

Importance: HIGH

Good value: >2700 Mbps

600 Mbps
ASUS DSL N55U delivers 600 Mbps Wi-Fi speed, which is lower than 66.5% of routers and equal to 5% of routers.
Channel widths supported
What it is: Lists the Wi-Fi channel widths the router can use, such as 20, 40, 80, or 160 MHz.
When it matters: When you want the option to trade peak speed against stability in crowded wireless environments.

Importance: MEDIUM

Good value: 20 MHz + 40 MHz + 80 MHz

20 MHz + 40 MHz
ASUS DSL N55U supports 20 MHz + 40 MHz channel width options, which is fewer than 59.9% of routers and the same as 34.8% of routers.
Show more
Wi-Fi security protocols
What it is: Lists the wireless security standards the router supports, such as WPA2 or WPA3.
When it matters: When you want stronger wireless protection without locking out older devices that still need compatibility.

Importance: HIGH

WPA2, WPA, WEP, WPS, 802.1X
ASUS DSL N55U supports WPA2, WPA, WEP, WPS, 802.1X Wi-Fi security protocols. 60.4% of routers use newer security protocols.
DoS protection
What it is: Provides defenses intended to reduce the impact of denial-of-service traffic against the router or network.
When it matters: When exposed services or remote access make resilience against traffic floods more important.

Importance: HIGH

yes
ASUS DSL N55U supports DoS protection. 11.1% of routers include DoS protection.
SPI intrusion protection
What it is: Uses stateful packet inspection to track sessions and block suspicious unsolicited traffic more accurately.
When it matters: When the router needs a stronger first line of filtering on an internet-facing connection.

Importance: HIGH

?
MAC address filtering
What it is: Lets the router allow or block devices based on their MAC addresses.
When it matters: When you want an extra device-level access rule beyond passwords and network names.

Importance: MEDIUM

yes
ASUS DSL N55U supports mac address filtering. 1% of routers include MAC address filtering.
URL filter
What it is: Allows the router to block or allow access based on website addresses or domain rules.
When it matters: When you need to restrict specific sites for children, guests, or work-policy reasons.

Importance: MEDIUM

yes
ASUS DSL N55U supports URL filter. 1.9% of routers include URL filtering.
Show more
IPv6 support
What it is: Support for the newer IPv6 internet addressing standard alongside the older IPv4 system.
When it matters: When your internet provider or network already uses IPv6, or you want the router to stay compatible as IPv6 use becomes more common.

Importance: HIGH

yes
ASUS DSL N55U supports IPv6. 10.9% of routers are IPv6-ready.
Dynamic routing
What it is: Supports routing protocols or dynamic route updates instead of relying only on static route entries.
When it matters: When the router sits in a more complex network with changing paths between multiple subnets.

Importance: MEDIUM

yes
ASUS DSL N55U supports dynamic routing. 46.8% of routers include dynamic routing.
Inter-VLAN routing
What it is: Allows the router to pass traffic between separate VLANs under controlled rules.
When it matters: When you need segmented networks to communicate selectively instead of staying fully isolated.

Importance: MEDIUM

?
VLAN tagging
What it is: Lets the router mark traffic with VLAN tags for segmented or ISP-specific network setups.
When it matters: When you separate guest, office, IoT, or ISP-required traffic into different network segments.

Importance: MEDIUM

?
QoS
What it is: Provides quality-of-service controls that prioritize some traffic over less important traffic.
When it matters: When calls, gaming, and downloads compete and you want latency-sensitive traffic protected.

Importance: HIGH

yes
ASUS DSL N55U supports QoS. 2.7% of routers include QoS controls.
Show more
N. of LAN ports
What it is: Measures how many LAN ports the router includes. A higher count expands direct connectivity for matching devices.
When it matters: When you run a home office with NAS, TV boxes, and desktops, having more LAN ports avoids extra switches and keeps latency lower on wired links.

Importance: HIGH

Good value: 4 ports

4
ASUS DSL N55U has 4 LAN ports, which is more than 23.4% of routers and the same as 69.5% of routers.
LAN port speeds
What it is: Lists the Ethernet speeds available on the router’s LAN ports, such as Gigabit or multi-gig.
When it matters: When wired transfers to NAS, desktops, or access points need more than basic Ethernet speeds.

Importance: HIGH

Good value: 1 Gbps

1 Gbps
ASUS DSL N55U offers 1 Gbps on its LAN ports, which is faster than 27.2% of routers and on par with 59.8% of routers.
N. of WAN ports
What it is: Shows how many separate WAN uplink ports the router provides for internet connections.
When it matters: When you use dual internet lines, backup WAN, or load balancing between multiple external links.

Importance: HIGH

Good value: 1 WAN port

2
ASUS DSL N55U has 2 WAN ports, which is more than 91.3% of routers and the same as 6.2% of routers.
N. of USB ports
What it is: Shows how many USB ports the router includes for storage, printers, or modem accessories.
When it matters: When you plan to share storage, attach a printer, or use USB-based network extras.

Importance: MEDIUM

Good value: 1 USB port

2
ASUS DSL N55U has 2 USB ports, which is more than 79.3% of routers and the same as 20.4% of routers.
Power over Ethernet (PoE)
What it is: Power over Ethernet support, meaning the router can receive power, deliver it, or be part of a PoE-based installation.
When it matters: When you want cleaner installation with fewer separate power cables, especially in ceilings, walls, racks, or remote locations.

Importance: MEDIUM

no
ASUS DSL N55U does not support Power over Ethernet (PoE). 0.5% of routers can be powered over Ethernet.
Show more
Management interface
What it is: Shows how the router is configured and monitored, such as web UI, app, or command-line tools.
When it matters: When setup depth and day-to-day admin convenience are part of the buying decision.

Importance: HIGH

Web UI
ASUS DSL N55U is managed via Web UI. 72.2% of routers offer more advanced management options.
Firmware upgrade method
What it is: Describes how router firmware updates are installed, such as automatic OTA, web UI, or manual upload.
When it matters: When you want security fixes and new features applied with less maintenance friction.

Importance: HIGH

Web UI
ASUS DSL N55U uses Web UI firmware updates. 69.5% of routers offer more convenient update methods.
Traffic monitoring
What it is: Lets the router track bandwidth usage by device, app category, or time period.
When it matters: When you need to find which devices or activities are causing slowdowns or high data use.

Importance: MEDIUM

yes
ASUS DSL N55U supports traffic monitoring. 17.5% of routers include traffic monitoring.
Guest Wi-Fi network
What it is: Lets the router create a separate wireless network for visitors or less-trusted devices.
When it matters: When guests need internet access without reaching private devices on the main network.

Importance: HIGH

yes
ASUS DSL N55U supports guest Wi-Fi network. 8.6% of routers offer a guest Wi-Fi network.
Captive portal
What it is: Supports a login or acceptance page that users must pass before getting internet access.
When it matters: When guest networks, rentals, cafes, or managed access points need a sign-in page.

Importance: MEDIUM

no
ASUS DSL N55U does not support captive portal. 23.9% of routers include captive portal features.
Show more
CPU clock speed
What it is: Shows the operating frequency of the router processor, often listed per core.
When it matters: When routing, encryption, QoS, and many active clients can put heavier load on the CPU.

Importance: HIGH

0.5 GHz
ASUS DSL N55U runs at 0.5 GHz, which is slower than 77.8% of routers and on par with 3.2% of routers.
RAM capacity
What it is: The amount of working memory available for sessions, routing tables, and running router services.
When it matters: When many devices, VPN tunnels, or advanced features need the router to stay responsive under load.

Importance: HIGH

Good value: >=512 MB

128 MB
ASUS DSL N55U has 128 MB of RAM, which is less than 50.7% of routers and the same as 17.1% of routers.
Internal storage
What it is: The built-in storage available for logs, apps, shared files, or other local router functions.
When it matters: When the router runs extra services and needs space for logs, packages, or shared content.

Importance: MEDIUM

Good value: >=8 GB

0.008789 GB
ASUS DSL N55U has 0.008789 GB of internal storage, which is less than 86.5% of routers and the same as 8.1% of routers.
Hardware acceleration
What it is: Uses dedicated hardware paths to offload routing, NAT, encryption, or switching tasks from the main CPU.
When it matters: When heavy routing or security features would otherwise reduce throughput on the processor alone.

Importance: HIGH

yes
ASUS DSL N55U supports hardware acceleration. 18.6% of routers include hardware acceleration.
N. of external antennas
What it is: Shows how many antennas are mounted externally on the router.
When it matters: When you want stronger adjustable coverage or plan to aim antennas for difficult room layouts.

Importance: MEDIUM

Good value: 3 antennas

3
ASUS DSL N55U has 3 external antennas, which is more than 58.4% of routers and the same as 13.3% of routers.
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ASUS DSL N55U vs the average router

  • Supports Automatic failover
    ASUS DSL N55U supports automatic failover, while the average router does not. 24.5% of routers offer automatic failover.
    What it is: Can switch to a backup internet connection automatically if the primary line fails.
    When it matters: When uptime matters and the network cannot stop every time the main WAN drops.

    Importance: MEDIUM

    ASUS DSL N55U supports automatic failover, while the average router does not. 24.5% of routers offer automatic failover.
  • 1 more WAN ports
    ASUS DSL N55U has more WAN ports than the average router (2 vs 1). The average router has 1 WAN ports.
    What it is: Shows how many separate WAN uplink ports the router provides for internet connections.
    When it matters: When you use dual internet lines, backup WAN, or load balancing between multiple external links.

    Importance: HIGH

    Good value: 1 WAN port

    ASUS DSL N55U has more WAN ports than the average router (2 vs 1). The average router has 1 WAN ports.2 vs 1
  • 295,904 more NAT sessions
    ASUS DSL N55U has more concurrent NAT sessions than the average router (300,000 vs 4,096). The average router supports 4,096 concurrent NAT sessions.
    What it is: The number of simultaneous NAT-tracked connections the router can handle before tables become a bottleneck.
    When it matters: When many apps and devices open lots of parallel internet sessions at the same time.

    Importance: MEDIUM

    Good value: >=16000 sessions

    ASUS DSL N55U has more concurrent NAT sessions than the average router (300,000 vs 4,096). The average router supports 4,096 concurrent NAT sessions.300,000 vs 4,096
  • 1 more USB ports
    ASUS DSL N55U has more USB ports than the average router (2 vs 1). The average router has 1 USB ports.
    What it is: Shows how many USB ports the router includes for storage, printers, or modem accessories.
    When it matters: When you plan to share storage, attach a printer, or use USB-based network extras.

    Importance: MEDIUM

    Good value: 1 USB port

    ASUS DSL N55U has more USB ports than the average router (2 vs 1). The average router has 1 USB ports.2 vs 1
  • Stronger Wi-Fi security
    ASUS DSL N55U supports the Wi-Fi security protocols WPA2, WPA, WEP, WPS, 802.1X, while the average router supports WPA2, WPA, WEP, WPS. 0.00% of routers support WPA2, WPA, WEP, WPS, 802.1X.
    What it is: Lists the wireless security standards the router supports, such as WPA2 or WPA3.
    When it matters: When you want stronger wireless protection without locking out older devices that still need compatibility.

    Importance: HIGH

    ASUS DSL N55U supports the Wi-Fi security protocols WPA2, WPA, WEP, WPS, 802.1X, while the average router supports WPA2, WPA, WEP, WPS. 0.00% of routers support WPA2, WPA, WEP, WPS, 802.1X.WPA2, WPA, WEP, WPS, 802.1X vs WPA2, WPA, WEP, WPS
  • 12.5% higher user score
    ASUS DSL N55U has a higher user score than the average router (9.00 vs 8,000).
    What it is: A rating that combines user reviews and the total number of reviews received by the router.
    When it matters: When you want to know how a router performs in daily use and how reliable it is for speed, coverage, and stability according to user feedback.
    ASUS DSL N55U has a higher user score than the average router (9.00 vs 8,000).9 vs 8
  • Better integrated modem
    ASUS DSL N55U uses a ADSL2+ modem, while the average router uses none (external modem required). 0.00% of routers use a ADSL2+ modem.
    What it is: Identifies the built-in broadband modem standard, such as DOCSIS, ADSL, or VDSL.
    When it matters: When the router must connect directly to your ISP line without a separate modem box.

    Importance: MEDIUM

    ASUS DSL N55U uses a ADSL2+ modem, while the average router uses none (external modem required). 0.00% of routers use a ADSL2+ modem.ADSL2+ vs none (external modem required)
  • Stronger Wi-Fi security
    ASUS DSL N55U supports the Wi-Fi security protocols WPA2, WPA, WEP, WPS, 802.1X, while the average router supports WPA2, WPA, WEP, WPS. 0.00% of routers support WPA2, WPA, WEP, WPS, 802.1X.
  • Supports Automatic failover
    ASUS DSL N55U supports automatic failover, while the average router does not. 24.5% of routers offer automatic failover.
  • 295,904 more NAT sessions
    ASUS DSL N55U has more concurrent NAT sessions than the average router (300,000 vs 4,096). The average router supports 4,096 concurrent NAT sessions.
  • 1 more WAN ports
    ASUS DSL N55U has more WAN ports than the average router (2 vs 1). The average router has 1 WAN ports.
  • 1 more USB ports
    ASUS DSL N55U has more USB ports than the average router (2 vs 1). The average router has 1 USB ports.
  • Better integrated modem
    ASUS DSL N55U uses a ADSL2+ modem, while the average router uses none (external modem required). 0.00% of routers use a ADSL2+ modem.

Total
Overall
Security
Networking
Ports
  • Narrower channel widths
    ASUS DSL N55U has a lower supported channel width than the average router (20 MHz + 40 MHz vs 20 MHz + 40 MHz + 80 MHz). The average router supports channel width of 20 MHz + 40 MHz + 80 MHz.
  • 58.6% slower Wi-Fi speed
    ASUS DSL N55U has a lower Wi-Fi speed than the average router (600 Mbps vs 1,450 Mbps). The average router reaches Wi-Fi speed of 1,450 Mbps.
  • No Beamforming
    ASUS DSL N55U does not support beamforming, while the average router does. 59.7% of routers include beamforming.
  • Limited firmware updates
    ASUS DSL N55U supports the firmware update methods Web UI, while the average router supports Web UI, App, Automatic. 0.00% of routers support the firmware update methods Web UI.
  • Weaker management tools
    ASUS DSL N55U uses the management interface Web UI, while the average router uses Web UI, App. 0.00% of routers use the management interface Web UI.
  • Lower CPU clock speed
    ASUS DSL N55U has a lower CPU clock speed than the average router (0.5 GHz vs 2x0.5 GHz). The average router has CPU clock speed of 2x0.5 GHz.
  • 21.9 W higher power consumption
    ASUS DSL N55U uses more power than the average router (30 W vs 8.1 W). The average router uses 8.1 W power.
  • 128 MB GB less RAM
    ASUS DSL N55U has less RAM than the average router (128 MB vs 256 MB). The average router has 256 MB of RAM.
  • Limited firmware updates
    ASUS DSL N55U supports the firmware update methods Web UI, while the average router supports Web UI, App, Automatic. 0.00% of routers support the firmware update methods Web UI.
    What it is: Describes how router firmware updates are installed, such as automatic OTA, web UI, or manual upload.
    When it matters: When you want security fixes and new features applied with less maintenance friction.

    Importance: HIGH

    ASUS DSL N55U supports the firmware update methods Web UI, while the average router supports Web UI, App, Automatic. 0.00% of routers support the firmware update methods Web UI.Web UI vs Web UI, App, Automatic
  • Narrower channel widths
    ASUS DSL N55U has a lower supported channel width than the average router (20 MHz + 40 MHz vs 20 MHz + 40 MHz + 80 MHz). The average router supports channel width of 20 MHz + 40 MHz + 80 MHz.
    What it is: Lists the Wi-Fi channel widths the router can use, such as 20, 40, 80, or 160 MHz.
    When it matters: When you want the option to trade peak speed against stability in crowded wireless environments.

    Importance: MEDIUM

    Good value: 20 MHz + 40 MHz + 80 MHz

    ASUS DSL N55U has a lower supported channel width than the average router (20 MHz + 40 MHz vs 20 MHz + 40 MHz + 80 MHz). The average router supports channel width of 20 MHz + 40 MHz + 80 MHz.20 MHz + 40 MHz vs 20 MHz + 40 MHz + 80 MHz
  • 58.6% slower Wi-Fi speed
    ASUS DSL N55U has a lower Wi-Fi speed than the average router (600 Mbps vs 1,450 Mbps). The average router reaches Wi-Fi speed of 1,450 Mbps.
    What it is: The advertised maximum wireless throughput rating of the router under supported conditions.
    When it matters: When several users stream, download, and game at once and you want more wireless headroom.

    Importance: HIGH

    Good value: >2700 Mbps

    ASUS DSL N55U has a lower Wi-Fi speed than the average router (600 Mbps vs 1,450 Mbps). The average router reaches Wi-Fi speed of 1,450 Mbps.600 Mbps vs 1,450 Mbps
  • Weaker management tools
    ASUS DSL N55U uses the management interface Web UI, while the average router uses Web UI, App. 0.00% of routers use the management interface Web UI.
    What it is: Shows how the router is configured and monitored, such as web UI, app, or command-line tools.
    When it matters: When setup depth and day-to-day admin convenience are part of the buying decision.

    Importance: HIGH

    ASUS DSL N55U uses the management interface Web UI, while the average router uses Web UI, App. 0.00% of routers use the management interface Web UI.Web UI vs Web UI, App
  • Lower CPU clock speed
    ASUS DSL N55U has a lower CPU clock speed than the average router (0.5 GHz vs 2x0.5 GHz). The average router has CPU clock speed of 2x0.5 GHz.
    What it is: Shows the operating frequency of the router processor, often listed per core.
    When it matters: When routing, encryption, QoS, and many active clients can put heavier load on the CPU.

    Importance: HIGH

    ASUS DSL N55U has a lower CPU clock speed than the average router (0.5 GHz vs 2x0.5 GHz). The average router has CPU clock speed of 2x0.5 GHz.0.5 GHz vs 2x0.5 GHz
  • No Beamforming
    ASUS DSL N55U does not support beamforming, while the average router does. 59.7% of routers include beamforming.
    What it is: Uses signal-shaping techniques to direct wireless energy more effectively toward connected clients.
    When it matters: When coverage at the edge of the home needs to stay more stable for active devices.

    Importance: MEDIUM

    ASUS DSL N55U does not support beamforming, while the average router does. 59.7% of routers include beamforming.
  • 21.9 W higher power consumption
    ASUS DSL N55U uses more power than the average router (30 W vs 8.1 W). The average router uses 8.1 W power.
    What it is: The amount of electrical power the router draws during normal operation, usually measured in watts.
    When it matters: When the router stays on all day and you care about heat output and long-term electricity cost.

    Importance: MEDIUM

    Good value: <6 W

    ASUS DSL N55U uses more power than the average router (30 W vs 8.1 W). The average router uses 8.1 W power.30 W vs 8.1 W
  • 128 MB GB less RAM
    ASUS DSL N55U has less RAM than the average router (128 MB vs 256 MB). The average router has 256 MB of RAM.
    What it is: The amount of working memory available for sessions, routing tables, and running router services.
    When it matters: When many devices, VPN tunnels, or advanced features need the router to stay responsive under load.

    Importance: HIGH

    Good value: >=512 MB

    ASUS DSL N55U has less RAM than the average router (128 MB vs 256 MB). The average router has 256 MB of RAM.128 MB vs 256 MB
Total
Wireless
Management
Hardware

Graphic comparison of ASUS DSL N55U and other routers

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Third-party reviews

United Kingdom
amazon
3.5
245 Reviews
United States
Amazon_logo.png
4.4
1705 Reviews

(Reviews last updated: May 2026)

What customers like about ASUS DSL N55U?

  • Excellent dual-band wireless range and signal stability, often covering multiple floors without drops
  • Very easy to set up and configure using the intuitive ASUS-WRT web interface
  • High performance for multitasking due to discrete dual CPUs handling modem and router tasks separately
  • Effective Quality of Service (QoS) features that work well for managing bandwidth-heavy tasks like bittorrent
  • Versatile connectivity with two USB ports for sharing files, printers, or using 3G/4G dongles
  • Does not heat up significantly even during continuous heavy use

What customers dislike about ASUS DSL N55U?

  • Considered expensive compared to other ADSL modem-router combos in its category
  • Occasional stability issues with ADSL synchronization and signal-to-noise (SNR) ratios reported by some users
  • Lack of advanced parental control features like whitelist control or category-based filtering
  • Missing native wireless repeating functions
  • Reported difficulties in successfully configuring IPv6 connectivity despite built-in support
  • Firmware limitations for certain operating systems (e.g., initial lack of Windows 8 support)

Expert reviews

T
techenclave.com
06/04/2013
Asus DSL N55U - Reviews and Guides - TechEnclave

The ASUS DSL-N55U is a high-end, simultaneous dual-band ADSL2+ modem-router featuring dual CPUs to isolate modem and router functions, along with Gigabit Ethernet and versatile USB ports for file and printer sharing. Key pros include strong dual-band Wi-Fi performance, effective QoS management for heavy traffic, and the Download Master utility for PC-free downloads to USB storage....Read more

G
geek.digit.in
07/04/2013
Asus DSL-N55U Router Review. - Digit e-Magazine

The Asus DSL-N55U is a high-end dual-band ADSL2+ modem-router featuring a distinctive "Black Diamond" design and dual CPUs for dedicated processing. It offers robust simultaneous 600Mbps Wi-Fi and exceptional range, maintaining stable connections through multiple walls thanks to Ai Radar technology. Key advantages include its versatility as a NAS/media server via two USB ports and...Read more

A
alphr.com
24/06/2013
Asus DSL-N55U review - Alphr

The Asus DSL-N55U is a high-performing, dual-band ADSL2+ modem router offering a,600Mbps total bandwidth and exceptional, consistent speeds at both close and long range. It features superb USB storage transfer rates (12.2MB/sec) and gigabit ethernet capabilities, designed as a robust all-in-one networking solution. While providing excellent performance, the router lacks wireless...Read more

T
thinkbroadband.com
13/11/2012
Asus DSL-N55U ADSL2+ Dual-Band Modem/Router Review

The Asus DSL-N55U, reviewed by thinkbroadband, is a feature-rich, high-end ADSL2+ modem/router utilizing dual CPUs to prevent heavy local network traffic from destabilizing the DSL connection. Key advantages include four Gigabit Ethernet ports, USB 2.0 file/printer sharing, and simultaneous dual-band wireless, while noted disadvantages include poor IPv6 implementation, overly bright...Read more

C
community.spiceworks.com
27/01/2014
ASUS Computer International DSL N55U - Networking

The ASUS DSL-N55U is a high-end SOHO modem/router featuring a dual-CPU design that prevents performance bottlenecks. Key advantages include simultaneous dual-band Wi-Fi with strong range, four Gigabit Ethernet ports, and versatile USB 2.0 functionality for NAS, printing, and 3G/4G failover. It also includes a capable built-in VPN server, effective QoS, DLNA support, and an intuitive...Read more

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