When buying a new card, be sure to mention that you need “Wi-Fi compatible 802.11a/b/g/n wireless card with 128-bit encryption” (although encryption is not used at the moment in ITU, it will become mandatory in the near future and most cards come with it anyway).

Please note that all IEEE 802.11a, b, g or n standard compliant cards are not necessarily Wi-Fi compliant, whereas Wi-Fi compliant cards are IEEE 802.11a/b/g/n compliant. Look for the card with one of the following certificate:

Please check that your card’s model number is mentioned at http://www.wi-fi.com before you buy the card.

Check frequency range.

Please note that wireless cards manufactured for some specific countries may not work because of frequency limitations imposed in these countries.

For 802.11a/n at the 5 GHz band (5.15 – 5.35 GHz), the following channels are allowed in India:

Channels: 36 40 44 48 52 56 60 64.

For 802.11b/g/n draft at the 2.4 GHz band (2.4-2.4835 GHz), the following channels are allowed in India:

Channels: 1 to 13.

To avoid interference and to maximize throughput, we use only three channels 1, 6 and 11 in our 802.11b/g/n equipment.

Therefore, before buying a card, it is wise to check that it is on the compatibility list at http://www.wi‑fi.com and also that your frequency range is valid as described above.