You hear the term; Cisco 1140 series access points. So why do they call it series ? Because there are "2" models of 1140 series access points.
Cisco 1141 is a single band 2.4 GHz access point. This model doesnt support the 5 GHz band.
802.11g/n Controller-based AP; Int Ant; FCC Cfg
Cisco 1142 is a dual band 2.4 GHz / 5 GHz access point.
Cisco 1142 is a dual band 2.4 GHz / 5 GHz access point.
802.11a/g/n Controller-based AP; Int Ant; FCC Cfg
If you are deploying just 2.4 GHz 802.11g/n and have no furture need for the 802.11a/n band, then
you may want to consider the cost savings by ordering the 1141 model.