Like every other website on the planet, SmallNetBuilder uses cookies. Our cookies track login status, but we only allow admins to log in anyway, so those don't apply to you. Any other cookies you pick up during your visit come from advertisers, which we don't control.
If you continue to use the site, you agree to tolerate our use of cookies. Thank you!

Router Charts

Click for Router Charts

Router Ranker

Click for Router Ranker

NAS Charts

Click for NAS Charts

NAS Ranker

Click for NAS Ranker

More Tools

Click for More Tools

Wireless Reviews

Throughput vs. Path Loss

NOTE!NOTE: We don't refer to "range" in these plots, but instead use the more accurate "Path Loss". For an explanation, see the How we Test Wireless article.

Figure 12 was generated using the Compare Benchmarks tool of our Wireless Charts and shows up and downlink performance in 20 and 40 MHz channel modes in the 2.4 GHz band. There is a good throughput boost from 40 MHz mode at stronger signal levels. But the downlink curves in both 20 and 40 MHz modes end a bit earlier than uplink, indicating perhaps a slightly shorter range for downlink.

Throughput vs. Path Loss - 2.4 GHz

Figure 12: Throughput vs. Path Loss - 2.4 GHz

Figure 13 shows the curves in the 5 GHz band. Even though you can't directly compare 2.4 and 5 GHz results, it's clear that the DIR-855 follows the pattern set by many other dual-band draft 11n products with curves that end much earlier than the 2.4 GHz plots. This indicates a shorter range, which was confirmed by my walk-around tests.

But other than the shorter range, the 2.4 and 5 GHz throughput performance is very similar.

Throughput vs. Path Loss - 5 GHz

Figure 13: Throughput vs. Path Loss - 5 GHz

Throughput vs. Path Loss - D-Link Comparison

Since D-Link has three dual-band AP/router options, I thought I'd first compare them. Figure 14 shows 2.4 GHz, 20 MHz downlink plots for the 855, DGL-4500 and DAP-1522. It's surprising to see the 855 have significantly lower throughput than the 4500, especially since both are using the same mini-PCI radio.

But I think the answer lies in the clients used for the tests. The DGL-4500 was tested with the D-Link DWA-652, which is a Cardbus card using a single-band 2.4 GHz 3T3R (3 transmit, 3 receive) radio. The 855 was tested with the Netgear WNDA3100, which is a dual-band USB 2.0 adapter using a 2T2R radio. I suspect that using 3T3R radios on both AP and STA is the reason for the 4500's higher performance.

D-Link dual-band comparison - 2.4GHz, 20 MHz, downlink

Figure 14: D-Link dual-band comparison - 2.4GHz, 20 MHz, downlink

What's more interesting, however, is that the Ralink-based DAP-1522 has higher throughput than the 855 at stronger signal levels, even with 2T2R radios on both ends! But the same isn't true for uplink. Figure 15 shows the 855 doing better than the DAP-1522, thoughput the path loss range.

D-Link dual-band comparison - 2.4GHz, 20 MHz, uplink

Figure 15: D-Link dual-band comparison - 2.4GHz, 20 MHz, uplink

A similar pattern is found when we compare 2.4 GHz, 40 MHz mode performance. [Downlink plot] [Uplink plot]

Switching to 5 GHz, the 4500 is held back by its odd performance at stronger signal levels, which I theorized was due to some incompatibility between the Atheros-based 4500 and the Broadcom-based Linksys WPC600N dual-band card, which I used for the 4500's 5 GHz testing. But once signal levels start falling off, the two have similar performance.

D-Link dual-band comparison - 5GHz, 20 MHz, downlink

Figure 16: D-Link dual-band comparison - 5 GHz, 20 MHz, downlink

For uplink, the 4500 does better, including staying connected longer. I attribute this to the WPC600N's 3T3R radio.

D-Link dual-band comparison - 5GHz, 20 MHz, uplink

Figure 17: D-Link dual-band comparison - 5 GHz, 20 MHz, uplink

Similar results are found with 5 GHz, 40 MHz mode performance. [Downlink plot] [Uplink plot]

Use the Wireless Charts to generate other comparisons or dig deeper into these.

More Wireless

Wi-Fi System Tools
Check out our Wi-Fi System Charts, Ranker and Finder!

Support Us!

If you like what we do and want to thank us, just buy something on Amazon. We'll get a small commission on anything you buy. Thanks!

Over In The Forums

I wanted to buy RT-AX92U. Since it comes in a AIMesh pack of 2, I was wondering if it is possible to use one unit at my home and another one at my off...
I want to configure my router so all traffic on my network goes through my VPN (PIA). However, I would like a single machine to be excluded from the V...
I'm am trying to update the firmware on my RT-AC68U. It is currently Merlin build 3.0.0.4.374.39. Initially my goal was to try and return it to the la...
Hello everyone I have a home lab that I dib and dabble in. I have recently taking up an interest in PBX and am about to connect to a Trunk. My PBX is ...
Small business. Main network is handled by ISP. We manage our wireless network. We have 3 AC66U. 1 is running in AP Mesh Router mode, 2 are in node mo...

Don't Miss These

  • 1
  • 2
  • 3