60MIM-IMA-4E1/MIM-IMA-8E1IntroductionThe 4-port/8-port E1 ATM inverse multiplexing interface module (MIM-IMA-4E1/MIM-IMA-8E1)provides four/eight E1 interfaces that support the IMA (inverse multiplexing for ATM) technology.The IMA technology combines multiple low-speed links into a group to support a high-speed ATMcell stream: It distributes an ATM cell stream over multiple low-speed E1 links on cell by cell basis atthe transmission end and reassembles the cells on the low-speed E1 links into the original stream atthe far end. This technology provides a scalable and cost-effective solution, and is commonly used inplesiochronous digital hierarchy (PDH) networks to transport ATM cells.Interface specificationsTable 83 Interface specificationsItem MIM-IMA-4E1(75-ohm)MIM-IMA-8E1(75-ohm)MIM-IMA-4E1(120-ohm)MIM-IMA-8E1(120-ohm)Connector DB68Number ofconnectors 1Interfacestandard• ITU-G.703• ITU-G.704Interface rate 2.048 MbpsCable type 75-ohm 4E1conversion cable75-ohm 8E1conversion cable120-ohm 4E1conversion cable120-ohm 8E1conversion cableMaxtransmissiondistance500 m (1640.42 ft) 150 m (492.13 ft)Operatingmode ATM E1 independent link/IMA bundle modeSupportedservice AAL5 (ATM adaptation layer 5)Protocol• PPPoA• PPPoEoA• IPoA• IPoEoAService type• CBR• VBR-rt• VBR-nrt• UBR
