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CLI-based Configuration Guide - Interface Management

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Overview of IMA

Overview of IMA

IMA allows a sender to break up the ATM cell flows and distributes the cells over multiple low-speed links, and allows a receiver to recombine the cells into the cell flows.

IMA Principle

ATM cells are transmitted over the links based on the Round Robin distribution mechanism. This mechanism allows each separate cell to be sent cyclically over the links. An IMA group periodically sends IMA Control Protocol (ICP) cells to define IMA frames. ICP cells enable the receiver to reconstruct the ATM cell stream. Based on the arrival time of IMA frames, the receiver can detect and adjust the link differential delay to remove the cell delay variation (CDV) imported by ICP cells.

The sender sends cells consecutively. If no ATM layer cell can be sent in an IMA frame between ICP cells, the IMA sender adds filler cells to ensure consecutive cells. The IMA receiver discards these filler cells.

Figure 19-1 shows the transmission of ATM cells in an IMA group.

Figure 19-1  Transmission of ATM cells in an IMA group

IMA System

As shown in Figure 19-2, there is one or multiple physical links between Router A and Router B.

  • You can use a single E1-IMA links or G.SHDSL links to transmit services.

  • When you require high bandwidth that a single E1-IMA links or G.SHDSL links cannot provide, you can bind multiple E1-IMA links or G.SHDSL links to an IMA group to transmit services.

An IMA group is a logical link multiplexing one or more low-speed links. It provides high bandwidth and supports high-speed ATM cell stream. The bandwidth of an IMA group is approximately the sum of the bandwidths of all member links. IMA technology is flexible to use and cost-effective.

Figure 19-2  IMA System

Updated: 2019-03-06

Document ID: EDOC1100069331

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