TP-Link Deco X20-4G test: a complete and 4G compatible Wi-Fi box

An interesting addition to the other boxes in the range, the Deco X20-4G from TP-Link allows you to add 4G connectivity to your installation while also benefiting from Wi-Fi 6 and compatibility with the rest of the Deco.devices

Source: Edouard Patout for Frandroid

Wi-Fi or 4G, You choose. The box TP-Link Deco X20-4G allows you to take advantage of a Wi-Fi 6 network of quality and is also equipped with 4G connectivity allowing it to be used without (or in addition to) a conventional internet connection. The box can also be integrated into an existing Deco mesh network.

The device is sold alone at recommended price of 220 euros and has the same features as the rest of the range. It will thus be able to address users with a sufficiently high-performance internet connection or wishing to add a backup link to their usual internet connection.

TP-Link Deco X20 4GSpecifications


TP-Link Deco X20 4G Wireless Wi-Fi 6 (ax) Maximum Wi-Fi Speed

1.8 Gbps Wi-Fi coverage

Up to 200 m²

Number of devices maximum connected reels 150 Mesh System

Yes 4G compatibility Yes Supported 4G bands

2100MHz (B1), 800MHz (B20), 1800MHz (B3), 2600MHz (B7), 700MHz (B28) 5G compatibility Nope Number of Ethernet ports 3 Debit Maximum Ethernet

1 Gbps

Voice Assistant

Amazon Alexa Network Security


Price €193 Product sheet See the test

This test was carried out using a loaned product by brand.

TP-Link Deco X20 4GDesign: discreet and simple

The Deco X20-4G comes in the form of a discreet cylinder made entirely of white plastic in line with the other devices in the range. The brand allows itself a slight originality on the upper part with a wave effect where its very discreet logo takes pride of place.

Source: Edouard Patout for Frandroid

In practice, the Deco X20-4G is much more compact and discreet than

the imposing cases of the X90 kit that we’ve tested. It is, on the other hand, a little higher than the “classic” X20 boxes with which it is therefore logically compatible. Rather light, we regret the absence of a non-slip coating which would have prevented it from wandering due to the cables connected to the back.

Source: Edouard Patout for Frandroid

The connection of the case therefore takes place at the back and is logically composed of a connector for the power supply which is here accompanied by 3 RJ45 ports (1 Gb/s). These will allow you to connect the X20-4G to our local network, but also to connect devices that need to be wired.

Source: Edouard Patout for Frandroid

A small cover, also positioned at the back, houses two connectors for external antenna. An appendix that was also found on the router of Netgear NBK752 kit. The NanoSIM card has a dedicated slot positioned under the case. It is not the most accessible place, but it will generally not be necessary to access it regularly.

Source: Edouard Patout for Frandroid

The case is also equipped with an indicator LED which will change color depending on the status of the device and connection. No button is present on the X20-4G, with the exception of a button reset, located near the SIM slot.

The Deco X20-4G is compatible with other boxes in the Deco range // Source: Edouard Patout for Frandroid

If he does not also premium than its competitors at Netgear, the Deco X20-4G from TP- Link is nevertheless much more discreet and will be much easier to integrate into everyone’s interior. In the same way, it is easier to imagine transporting it on the move.

TP-Link Deco X20 4GFunctionality identical to the top of the range

The experience and the features offered on this X20-4G kit are very similar (if not identical) to what was found on the high-end model of the brand. The first configuration via the application is particularly clear with immediate detection of the device and support that will allow everyone to put the box into operation.

If Netgear tends to put (too ) forward cellular connectivity during the initial configuration, TP-Link gives us a clear choice here by explaining the different possible choices. Once the X20-4G has been configured, we benefit from a very complete application allowing you to finely customize the operation of the device.

We thus find the immense majority of the essential and advanced functionalities such as the management of the DHCP, the port forwarding or even VLAN management to possibly get rid of your operator’s box. The functions are not as comprehensive as the competition, but more than enough for the overwhelming majority of users.

The application also allows consult the list of connected devices and the connection status while offering a menu dedicated to the operation of the cellular connection which can logically be used as a backup e your usual internet connection, with an automatic switch.

The HomeShield security and filtering functions are still included and are very complete with real parental control, the possibility of blocking certain sites or even receiving notifications. To go further and take advantage of additional features, a subscription is also available, but we won’t discuss the latter in this test.

The observation is therefore the same as for the X90 kit: we take advantage of a application that is easy to use and globally complete. It will suit both neophytes and more demanding users, although some features are missing compared to what the competition offers.

TP-Link Deco X20 4GPerformance: very good and a mystery 4G…

In order to judge the performance of the TP-Link Deco X20-4G, we subjected it to our usual test protocol. This consists of carrying out speed tests in both directions using a portable PC in Wi-Fi 6 which communicates with a server connected directly to the box.

Source: Edouard Patout for Frandroid

In optimal conditions, we reach here an average speed of about 830 Mb/s for download. The flow in upload remains a little behind with “only” 652 Mb / s on average. By changing rooms, the downlink speed stabilizes at just over 650 Mb/s while the uplink speed peaks at around 380 Mb/s.

The outdoor test and therefore behind a load-bearing wall is surprisingly convincing. Indeed, the X20-4G manages to maintain a stable link around 330 Mb/s in download and easily reaches 200 Mb/s in upload

. The 4G test allows us to reach 50 Mb/s in download and barely 1 Mb/s in upload. Nothing exceptional, but it is here the limitations of the technology and the coverage of the operator that logically weigh down the speed.

The automatic switch to the 4G link takes place in around twenty seconds after the the Ethernet link. A fairly honorable value, although twice what Netgear offers. The wired return is on the other hand much more effective with a switchover which is carried out in less than 10 seconds.

If the switchover is carried out without incident for the devices connected in Wi-Fi to the box , we encountered some difficulties with our computer connected by Ethernet. Indeed, for some reason that we do not know, when switching to 4G, the computer completely loses its connectivity, as if the X20-4G refused to provide it with an IP address.

We contacted TP-Link on this subject, but have not yet received any response. We will not fail to update this test when we have had further explanations.

TP- Link Deco X20 4G Pricing and Availability

The Deco X20-4G is available at the recommended price of 220 euros.

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