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Updated 6/4/2013: More TurboQAM info

With the formal release of the draft 802.11ac spec coming up this November, consumer router manufacturers are pushing us hard to send our N routers to the recycle pile and move along to the brave new world of AC. As it always is with new technology, one of the barriers to entry is high price,.

Although WD's My Net AC1300 had been recently discounted to as low as $130, it's now back up to $160. And other top-end draft 11ac routers sit somewhere between there and $200. Hence, the race to get cheaper AC routers to market.

ASUS has joined the party with its RT-AC56U that it showed at January's CES and formally announced at Computex. ASUS confirmed Computex PR activity for the product, but said that a formal North American announcement would be done closer to availability, "which should be towards the end of June". In the meantime, let's take a brief look at what's makes the AC56U tick.

The photo below taken at ASUS' CES suite shows the RT-AC56U is an AC1200 class router. This means that both 2.4 and 5 GHz radios are 2x2 (two transmit, two receive channels) supporting maximum link rates of 867 Mbps in 5 GHz and 300 Mbps in 2.4 GHz.


ASUS RT-AC56U at CES 2013
[photo credit:]

AC1200 routers are a good match for folks looking to upgrade computers and notebooks to draft 11ac, since 2x2 USB adapters are the fastest we're going to see for awhile. If you're looking for full 3x3 AC1300 Mbps link rates, your options are an AC1750 router in bridge mode, ASUS PCE-AC66 PCIe adapter or a dedicated AC1300 wireless bridge.

The rear view of the AC56U below shows Gigabit WAN (1) and switched LAN (4) ports, one USB 2.0 port and one USB 3.0 port. Unlike its flagship RT-AC66U, the AC56U has internal antennas vs. removable dual-band external dipoles.



The FCC ID photo of the rear of the board shows ASUS' signature large heatsink that provides thermal relief for all the main components. You can also see the four antennas—two per band—printed onto the board.

ASUS RT-AC56U board rear

ASUS RT-AC56U board rear

Here's the front of the board. This is what you see when you pop off the front cover.

ASUS RT-AC56U board front

ASUS RT-AC56U board front

Here is the rear side again, but with the heatsink and three RF shields removed. The processor SoC is at the upper left, 2.4 GHz radio below it and 5 GHz radio to the right.

ASUS RT-AC56U board rear - exposed

ASUS RT-AC56U board rear - exposed

The FCC ID document had nice close-ups of most all the key components, which are summarized in the table below along with the RT-AC66U's and the Linksys EA6300. The photos were not clear enough to make out the flash memory size, so I've pegged it at 128 MB. This has been confirmed by RMerlin, who has had early hardware access.

CPU Broadcom BCM4708A Broadcom BCM47081A0 Broadcom BCM4706
Switch Gigabit in BCM4708A Gigabit in BCM47081A0 Broadcom BCM53125
RAM 256 MB (ESMT M15F2G16128A) 128 MB 256 MB
Flash 128 MB 128 MB 128 MB
2.4 GHz Radio - Broadcom BCM43217 2x2 802.11b/g/n transceiver
- One (?) unspecified 2.4 GHz amplifier
Broadcom BCM43217
2x2 802.11b / g / n transceiver
5 GHz radio - Broadcom BCM4352
2x2 802.11a/b/g/n/ac transceiver
- Skyworks SE5003L 5 GHz Power Amp (x2?)
Broadcom BCM4352
2x2 802.11a/b/g/n/ac transceiver
- Two unidentified power amplifiers
- Broadcom BCM4360
- Skyworks SE5003L 5 GHz,
23dBm Power Amp
w/ Power Detector (x3)
Table 1: ASUS RT-AC56U key components compared

The AC56U's design is very similar to the original EA6300 that Linksys did not ship, but with some small differences. ASUS has given the AC56U twice the memory and opted for the slightly beefier BCM4708A vs. the BCM47081A in the Linksys. Both products use the same 2.4 and 5 GHz radios and both appear to add two external power amplifiers to the BCM4352 5 GHz radio.

The FCC ID photos aren't clear enough in either case to make out the make and model of the 5 GHz outboard amplifiers. But since Linksys cited performance problems as the reason for rebranding the EA6400 design as the EA6300v1, it will be interesting to see how the AC56U performs.

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