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Wireless Basics

8 Stream AC

Wi-Fi marketeers have shown they will ride the BNOB horse until it drops. They already tried using 60 GHz 802.11ad to create AD7200 products, which haven't really caught on. AD7200 routers are really four-stream AC routers with a 60 GHz radio. The extra radio enables Wi-Fi marketeers to bump up the BNOB, but provides no benefit to Wi-Fi devices that also don't have the extra radio.

Now it looks like the marketing wizards will use eight-stream 802.11ac to kick the number up to AC9600. Eight stream AC was first announced all the way back in 2015 by Quantenna and positioned as "10G Wave 3". While the 10G[bps] was good to grab attention, Quantenna's QSR10GT and QSQ10GU chipsets fall far short of the hyped speeds.

The GT version of the chipset includes an 8x8 5 GHz radio, with maximum specified link rate of 8.6 Gbps and a 2x2 2.4 GHz radio with maximum specified link rate of 0.5 Gbps, for a total potential BNOB of AC9100. The GU version pairs the same 5 GHz radio with a 4x4 2.4 GHz radio with maximum specified link rate of 1.0 Gbps, to push the total potential BNOB to AC9600.

As would be expected, Quantenna has quoted a maximum link rate using 160 MHz bandwidth, which won't be available in most real-world use cases. If we step down to the 80 MHz bandwidth standard for 802.11ac, the 8.6 Gbps drops down to a more realistic 4334 Mbps, assuming you have an 8 stream client that supports 1024-QAM. This would move the total BNOB down to AC5300 from AC9600, or maybe AC5350 to avoid confusion with today's tri-band 4x4 AC5300/AC5400 routers. Sighhh....

The table below shows maximum link rates for various combinations of spatial streams and channel widths. The green-shaded portion shows link rates supported in 802.11ac standard products. The yellow shaded portion shows the rates for products supporting 1024-QAM, which isn't standard in 802.11ac, but is supported in many "Wave 2" AC products.

Number of Spatial Streams 20 MHz B/W
256-QAM
(1 ch)
40 MHz B/W
256-QAM
(2 ch)
80 MHz B/W
256-QAM
(4 ch)
80 MHz B/W
1024-QAM
(4 ch)
160 MHz B/W
256-QAM
(8 ch)
160 MHz B/W
1024-QAM
(8 ch)
1 N/V 200 433 541 867 1084
2 N/V 400 867 1084 1733 2166
3 289 600 1300 1625 N/V N/V
4 N/V 800 1733 2166 3467 4334
8 693 1600 3467 4334 6933 8668
Table 1: Stream / Channel width / Maximum Link Rate w/ Short Guard Interval (SGI) [Mbps]

The red-shaded portion of the table shows rates that not many of us will ever experience because they rely on 160 MHz bandwidth. Believe them at your own folly.

So where are the 8 stream AC routers? The only one to appear so far is ASUS' GT-AC9600, introduced at Computex 2017 in May 2017. This SNBForums thread discussed the product when it surfaced and this one has FCC photos. The "GT" indicates the product will be aimed at the gaming crowd, who have proven to be reliably willing buyers of anything with a higher BNOB. But ASUS has announced neither availability nor pricing to date for the product.

TP-Link's Talon AD7200 - first 802.11ad router

ASUS GT-AC9600

Wikidevi also calls out the Arris TG3462 and TG3482ER and Technicolor CGM4140COM, which I suspect are service-provider only products, as using Quantenna' 8x8 AC chipset.

Caution!Bottom line: If 8 stream AC routers do appear, they will likely provide a performance boost for devices that support 5 GHz, just as four-stream routers generally provide better coverage than their two-stream siblings. But the problems that typically come with first-in-category products, especially from ASUS, should give any buyer pause. Add in the fact that the product's main differentiating feature is from Quantenna—the company that made "MU-MIMO ready" a phrase that lives in infamy—should freeze that wallet-grabbing hand...hard!

802.11ax

The big no-show at CES 2018 was 802.11ax routers. Oh, they were there in the form of pre-emptive announcements. But no working products were shown.

ASUS once again trotted out its RT-AX88U, which was announced at IFA 2017, saying it will ship in 1H 2018, but with no pricing announced yet. D-Link was also brave/foolish enough to announce a pair of AX routers in the form of its DIR-X6060 AX6000 and DIR-X9000 AX11000, which also were not priced. D-Link wouldn't commit to a ship date, but hinted at perhaps the end of 2018. NETGEAR, Linksys and TP-Link either said nothing or made encouraging noises about the bright, shiny future 11ax will bring, but that was about it.

D-Link AX6000 Ultra Wi-Fi Router (DIR-X6060) and AX11000 Ultra Wi-Fi Router (DIR-X9000)

D-Link AX6000 Ultra Wi-Fi Router (DIR-X6060) and AX11000 Ultra Wi-Fi Router (DIR-X9000)

Our CES 2018 wrapup brings you some of the inside baseball about 11ax's birthing, which continues to be rough. Things should be clearer after the May 11ax IEEE Task Group meeting, so stay tuned until then.

GoBottom line: 11ax is not on the table for consideration in 2018. If, by some chance, draft-standard 11ax routers do appear by the end of 2018, leave them for the early adopters.

Making the Choice

Wi-Fi continues to evolve at a rapid pace, with 802.11ax bringing the next shock to the system. Experience with past transistions (g to n, n to ac) has shown, aside from bragging rights, it really doesn't pay to be an early adopter. First versions of next-generation products are based on draft standards that may change before the standard is released and may have interoperability issues between products using different chipsets.

To make this clearer, here's a Pros & Cons table to help you decide whether to be an early adopter of new Wi-Fi technology:

Pros Cons
• Bragging rights / first kid on the block • Expensive
  • Backward compatibility problems - Current devices have problems staying connected or run slower
  • Interoperability problems - Products work better with same Wi-Fi chipset vendor in AP and STA
  • Based on draft standards - Released standard may support features not in draft product
  • Improvements, if any, may be only incremental for your existing devices
Pros & Cons of new Wi-Fi technology early adoption

'Nuff said.

So here are our recommendations in a nutshell:

  • If you have an N class router, it's way past time to upgrade to AC class. This can provide both throughput and range improvement, even with 11g or n devices. See Does An AC Router Improve N Device Performance?
  • If you have a small area to cover and just a few devices, AC1200 class will work fine.
  • AC1900 class / three stream routers continue to provide best price performance if you're looking for the next step up from AC1200.
  • If you want the best shot at coverage from a single Wi-Fi router, choose a four-stream, dual-band router (AC2600, AC3100/3150).
  • Tri-band routers don't provide additional coverage or throughput. They're mainly for increasing capacity, i.e. handling more devices.
  • Don't let MU-MIMO or 160 MHz bandwidth support influence your purchase decision. Both require support on the device side to work.
  • Routers that support DFS can help if you are having a hard time with interference from too many 5 GHz networks.
  • Try a tri-band extender like NETGEAR's EX8000 or Linksys' RE9000, if you like the router you have, or can't change it,
  • Choose a multi-device "mesh" system instead of "tri-band" AC5300/5400 routers, if you have a lot of devices and a large area to cover. Tri-band products like NETGEAR's Orbi, Linksys' Velop or eero Gen 2 have better backhaul performance than dual-band systems, which is key to overall Wi-Fi system performance.

Closing Thoughts

We hope we've helped you sort through the many options in Wi-Fi routers. But there is also more help in the form of our Router Charts, Finder and Ranker and Wi-Fi System Charts, Finder and Ranker to help in your further research. Use the Rankers first, if you just want to see how products rank for performance without getting into the details. If you want to look at detailed performance data, the Charts are for you. Finally, the Finders let you narrow your search by filtering by many product attributes.

Be sure to use the Test Method selector when using the Rankers and Charts so you see all the products available!

In the end, the only real way to know how a wireless router or Wi-Fi System will perform is to try it. The SNBForums are full of people agonizing over choosing the best router and getting confused by all the conflicting reviews and advice. Sometimes they get their "perfect" router home and all is well. But other times, it becomes the router from hell that won't play nice at all in their specific environment. If that happens to you, just return the router and move on to your second choice.

Once you've made your choice, buy from a retailer with a liberal return policy. Amazon has one and you'll get all your money back (minus shipping) as long as you return the product in the same condition as you received it. And since we get a small commission on anything you buy from Amazon if you get there via any of our buy links, you'll help support SmallNetBuilder. But no matter where or what you buy, make sure you're getting something that works for you!

Good luck and happy hunting!

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