What is the impact of having both the 802.11g and 802.11n access points in the same environment? Will this cause conflicts for the clients in this environment?
Whenever you have a mixed group of clients, there will need to be a way to protect them from talking on top of each other. The 802.11 protocol calls this ‘Protection Mode’ – and it allows for mixing of different types of clients. This does NOT force the .11n clients to go at .11g speeds! But it does for them to preface each data transmission with an extra frame or two to ‘clear the air’ before transmitting. This does cause some additional overhead and will slow down the newer devices. (The older devices do not need to protect themselves)
It is far better to have all .11n clients and .11n access points – we call this ‘Green Field’ mode. But in the real world it is fairly impractical to achieve.
Can you catalog users by the frequency?
Most enterprise-class Access Points have the ability to help ‘steer’ client devices between the two supported frequencies, from the crowded 2.4GHz range to the less-congested 5GHz frequencies. This feature is one more item that sets enterprise-class AP’s apart from their less capable, cheaper, SOHO cousins.
In fact, in the 802.11ac specifications, ALL client devices MUST be capable of moving to the less-crowded 5GHz frequencies.