Doing any WLAN or wired network testing? LANforge 5.3.4 provides RF interference patterns, Ath10K QCA9980 Wave-2 drivers, and testing scripts for automated WiFi capacity and captive portal testing.
We are going to be at LinuxFest Northwest this weekend. Come see our CT523, programmable wifi attenuator and our software!
When most people think of network encumbrance, they think of a 1Mbps line that they might connect campuses with. Networking is much faster these days. What if you need to emulate encumbrance on a 10gigabit line between your data centers?
That’s a picture of a wanlink with 10 seconds of delay on a 10 gigabit line.
Getting the wave-2 chipset working over the air has been surprisingly challenging. Cabled transmission (SMA cables) to an AP was working mildly well, and over the air (OTA) transmission was just not working at all.
We decided to investigate the power requirements of the chip. We were told that power draw would be up to 14 watts. We’ve seen PCIe cards draw 12W from the PCIe bus before. This radio has power connector points on the board for an extra 5v lead.
To our surprise, hooking up a 5V lead from a floppy drive power header on the motherboard was inadequate. So we attached multi-meters and saw that it was pulling the 5v line down to 4.22V and drawing 2.5amps. Holy cow!
We decided we needed power off of the 12V line. Soldering up a 15W linear regulator, we got a much steadier 5V supply to the card. It worked!
This time, we were able to connect a station to the AP and start a 850Mbps download without any trouble. Whew!
The large card is a Wave-2 MU-Mimo card. The card with the metal can on it is an Ath10k card by Doodle Labs.
The wave 2 card draws extra power from a Molex cable. It operates on 10-15W of system power. It needs thermal management and a heat-sink case with proper thermal contact is ideal.
Count all those antenna mountings!