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Wireless Reviews

Extender intro

Introduction

We first took a stab at the extender roundup about a month ago. Results were surprisingly similar, but there were some anomalies pointed out to us by a vendor who was particularly displeased with the results. So we went back and took a closer look at our test process and found a high level of interference in the 2.4 GHz band in our outdoor test location.

As a result, we redesigned the entire process, moving it inside, where wireless interference was significantly reduced, and using channel utilization monitoring to choose our test channel and to monitor spectrum use during testing. The new process is described in detail here.

To recap, wireless xxtenders are a special class of wireless repeaters that work with any router or access point. (The other kind of repeater requires Wireless Distribution System (WDS) support on both the base router / access point and the one repeating the signal.)

Extenders have never been something that's excited us. Since there is one radio per band, throughput is immediately halved because that radio needs to take up twice the airtime to move each packet (once to receive from the main router / AP and again to transmit that packet to the client). Twice the airtime means half the bandwidth, so using an extender automatically puts you at a major throughput disadvantege.

That said, today's extenders are generally single-band N300 and simultaneous dual-band N600 class. These open up possibilities not possible with 802.11g extenders that linked at only 54 Mbps at best.

But how good are today's extenders? We put out the call and received 11 extenders from different manufacturers. The extenders came in all shapes and sizes, some wall-plugged, others desktop style. Some very simple, others very elaborate, with different chipsets. Overall, it was great selection with very good variety.

I'm going to break the roundup into N300 extenders and N600 extenders and start with the N300 units. Below is the list of the single-band N300 class extenders tested. (Prices shown are as of the review date. Click on the price to get the latest Amazon pricing.)

Product Price Firmware Chipset FCC ID Dual or single
TRENDnet TEW-737HRE $40 1.00B15 Atheros AR1321 XU8TEW737HRE Single band
Linksys RE2000 $76 1.0.01, build 7 Ralink RT6856 Q87-RE2000 Dual band, not concurrent
D-Link DAP-1320 $33 1.10 Atheros AR9341 KA2AP1320A1 Single band
Amped Wireless REC10 $69 1.2f.17 Realtek RTL8196C ZTT-REC10 Single band
TP-LINK TL-WA850RE $65 3.14.8 Build 130922 Rel.53068n Atheros AR9341 TE7WA850RE Single band
NETGEAR WN3000RP $66 V1.0.1.36_1.1.47 Broadcom BCM5357B0 PY310300142 Single band
Edimax EW-7438RPn $30 1.31 Realtek RTL8196EU NDD9574381304 Single band
Linksys RE1000 $54 1.0.02 Broadcom BCM5357 Q87-RE1000 Single band
Table 1: The Products Tested

When you scan the list, the RE2000 jumps right at you; it's the only "dual band" extender on the list. However, all dual-band extenders are not created equal. On our N600 list, all dual-band extenders have two radios and can extend both 2.4 GHz and 5 GHz concurrently. On the RE2000, you must choose one band or the other.

Another thing I didn't like about either the RE2000 or RE1000 was the lack of an extender SSID. This means you can't have a separate SSID for your extender's network. Since an extender is never going to have amazing bandwidth, I feel having an extender SSID is rather important to ensure your client doesn't connect to it while in your prime wireless areas. The TRENDnet TEW-737HRE was the only extender, other than both Linksys extenders, that did not offer an extender SSID.

Inside

There is quite a smörgåsbord of chipsets inside this group of extenders. But you can see similarities. The Amped and Edimax extenders both use the Realtek RTL8196, while the NETGEAR and Linksys RE1000 are both based on Broadcom's BCM5357. The Atheros AR9341 is also shared between two devices, the D-Link and TP-LINK. The lone wolves are the TRENDnet that uses an Atheros AR1321 and the Linksys RE2000 that uses a Ralink RT6856.

Note that there are V2 versions of both the Linksys extenders, but Linksys provided the original V1 versions for review. We asked about this and found that the RE2000V2 won't be shipping until late December of this year. We never got an answer about the RE1000V2.

The RE1000V2 uses a Ralink RT6855 Processor / RT5392 radio. The RE2000V2 FCC photos are still being suppressed. But WikiDevi says it is using a MT7620x (Wi)SoC.. "and perhaps an RT5592".

I'm not including internal photos. But you can use the links on the FCC IDs in Table 1 to access the Internal Photo links for yourself.

Test Process

You can read details of the revised test process at How We Test Wireless Extenders. But the jist is that we limit router transmit power using fixed attenuators to get true dead spots for both 2.4 and 5 GHz. We then put an extender in place and put a test laptop in the deadspot to measure throughput through the extender. The deadspot is now inside my home in the basement vs. outside and I monitor real-time channel utilization with MetaGeek's Chanalyzer Pro during 2.4 GHz testing. So interference from neighboring wireless no longer affects testing.

Setup

I loosely followed the quick start guide to set up each extender. The prize for the install guide that made things way more complicated than needed definitely goes to Edimax. Its setup was no different than the others. But its quick start guide was significantly more complex.

All of the extenders support WPS and can quickly be set up with a push of the button on the router and on the extender. I did just that for a few of them. But with most, I simply connected to the wireless network the extender transmitted and set it up from there.

I placed all extenders in the same physical location whether they were desktop or wall-pluggable, to provide as level a playing field as possible. I also made sure to orient my laptop the same way each time.

Lastly, take note that the throughput numbers I came up with are not necessarily absolute best throughput numbers you might obtain. There are just too many variables when it comes to testing extenders. I tested every extender within a 2 hour window on the same channel while watching channel utilization. Any deviation in results from the 50% throughput reduction rule of thumb causes the extender to be retested several times. So we have high confidence the results provide valid relative performance numbers that can be compared.

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