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To configure a channelized IQ interface, you must perform one or more of the following procedures:

Configure a clear channel. A clear channel consolidates the entire bandwidth of a channelized interface into a single unpartitioned stream that looks like a standard interface. For example, a channelized OC12 IQ interface configured as a clear channel appears to have an OC12 SONET interface.
See Configuring a Clear Channel on a Channelized IQ Interface.
Configure single-level channels. By configuring single-level channels, you subdivide a channelized interface into a set of large end channels.
See Configuring Single-Level Channels on a Channelized IQ Interface.
Configure multilevel channels. You can subdivide a channelized interface and then split these subchannelized interfaces into end channels. Creating small end channels might require you to configure multilevel channels.
See Configuring Multilevel Channels on a Channelized IQ Interface.
Configure class of service. On channelized IQ interfaces, you can apply class of service at the logical interface level for Frame Relay data-link connection identifiers (DLCIs).
See Configuring a Class-of-Service Scheduler Map.