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Test Results - No Bandwidth Cap

With the limits removed, each device type was able to deliver its full throughput. The AC867's average throughput increased 5X, the N450's only 2X and the N150 and A54 remained unchanged. It's interesting to see the return of large throughput "dropouts" using open air testing. This is something I've missed since moving to RF-tight chamber testing.

Composite plot of individual tests - no data rate cap

Composite plot of individual tests - no data rate cap

The next plot shows the simultaneous testing results. The AC867 device had the farthest to fall and it did, dropping from 200 to 57 Mbps with a significant increase in throughput variation.

Composite plot of individual tests - no data rate cap

Composite plot of simultaneous tests - no data rate cap

Table 2 once again compiles the data from both no-cap runs and shows the calculated difference. The interesting take-away from this table is that the throughput reductions are about the same for the two devices that couldn't even hit the 40 Mbps cap before.

Client Class Individual Simultaneous % Difference
AC867 199.4 57.3 -71
N450 81.0 29.5 -64
N150 12.6 12.0 -4
A54 16.7 2.1 -87
Total 309.6 101.0 -67
Table 2: Bandwidth Loss - no data rate cap

The Weakest Link

Now we know that AC routers can suffer significant throughput loss running a mix of AC, N and A clients. So let's see if we can find the primary contributor(s) by running individual comparisons. The plot below shows a mix of AC867 and N450 clients with no throughput caps. Keep in mind the N450 client running alone averaged around 80 Mbps and the 867 client averaged just shy of 200 Mbps by itself.

The plot shows the AC867 connection dropped to an eyeballed average of 130 Mbps (35%) and the N450 moved down to 60 Mbps (25%).

Mixed network - AC867 & N450

Mixed network - AC867 & N450

A mix of AC867 and N150 clients dropped the former's throughput a wee bit more to around 120 Mbps (40%), while the N150 was essentially unchanged (12.6 to 12.8 Mbps).

Mixed network - AC867 & N150

Mixed network - AC867 & N150

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