The GHz range of a wireless radio is only partially related to the speed of a wireless network.
- 802.11a operates at 5GHz (Max 54Mbps)
- 802.11g operates at 2.4GHz (Max 54Mbps)
- 802.11n operates both simultaneous dual-band operation (2.4GHz / 5.0GHz)
Advantages of 5GHz:
- Less likely to be congested. The 2.4GHz frequency range is much more prone to interference, as it is commonly used by other wireless networks in the area, as well as cordless phones, garage door openers and other home appliances and consumer products.
Disadvantages of 5GHz:
- the higher the frequency of a wireless signal, the shorter its range. Thus, 2.4GHz networks cover a substantially larger range than 5GHz wireless networks. In particular, the higher frequency wireless signals of 5GHz networks do not penetrate solid objects nearly as well as 2.4GHz signals, limiting their reach inside homes.
Final Note : Ideally, we should deploy both 2.4GHz and 5.0GHz, in order to enjoy the faster bandwidth with less interference over longer distance.