AP2800-ATM4E1 is a network module of AP2850 & AP2830 multi-service Router supporting 4-port multiple E1 ATM interface, IMA (Inverse Multiplexing over ATM) interface and 2-port 10/100Base-T network interface.
ATM IMA feature combines number of ports and utilizes the port as an extended link. So without introducing additional devices or modifying the existing devices, it can expand the network bandwidth flexibly in case of network traffic increase.