How to specify which of 2 wifi cards to use

Hi All,
I recently installed Arch Linux on a USB (not live, a persistant installation). I have 2 wifi cards: one that came with the laptop and is used via PCIe, which is an Intel Centrino Wireless-N 2200. It's awful. The other, which is a USB wifi card and which I want to use, is an ASUS USB-N10. I checked linux-wless.passys.nl to see if the N10 was supported, and it said it was, and also said: "Supported by the rtl8192su and r8712u staging drivers in the mainline Linux kernel. Firmware from userspace is required." I can't get wifi working properly in Arch Linux, which makes it impossible to progress because I can't install anything and am stuck in just using terminal. I don't know how to specify which card to use in Arch. Any help would be much appreciated.
Thank you for your answers in advance!

After running ip addr, it doesn't display names for the different devices in a way that I can tell which ones they are. The names that it gave me are: "lo", "enp3s0", "wlp4s0", and "wlp0s20u2". I know that 2 of those are virtual ports for wireless devices that aren't being used, but I don't know how to differentiate.
EDIT: Also, when I try to navigate to etc/netctl/examples/wireless-wpa, it says "Correcting wireless-wpa to ."
EDIT 2: "lo" seems to be a generic interface, and I've narrowed down the names so now I know that my two wireless cards are 'wlp4s0" and "wlp0s20u2". When I ran iwconfig, I got
wlp4s0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=15dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key: off
Power Management: off
wlp0s20u2 unassociated Nickname:"rtl_wifi"
Mode:Auto Access Point: Not-Associated Sensitivity: 0/0
Retry:of RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
lo no wireless exentions
enp3s0 no wireless extensions
I'm assuming that this means that the latter two interfaces are the unused virtual interfaces. Does this tell you anything important?
Last edited by TheAtomicGoose (2014-04-07 21:05:28)

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