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NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access 01

This is NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access
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Overview of ATM IMA

Overview of ATM IMA

An IMA group can be considered a logical link that aggregates several low-speed physical links (member links) to provide higher bandwidth. The rate of the logical link is approximately the sum of the rate of the member links in the IMA group.

When users access an ATM network at a rate between T1 and T3 or between E1 and E3, using T3 or E3 lines is cost-ineffective for carriers. Using multiple T1 or E1 lines is more flexible and efficient. IMA allows a network designer and administrator to use multiple T1 or E1 lines, not the expensive T3 or E3 lines, to implement ATM access.

IMA is the acronym of Inverse Multiplexing for ATM. The general idea of IMA is that the sender schedules and distributes a high-speed ATM cell stream to multiple low-speed physical links for transmission, and then the receiver schedules and reassembles the stream fragments into one cell stream and submits the cell stream to the ATM layer. In this manner, bandwidths are multiplexed flexibly, improving the efficiency of bandwidth usage.

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Updated: 2019-01-02

Document ID: EDOC1100058399

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