Motorola MPC8260 PowerQUICC II User Manual page 757

Part IV. Communications Processor Module
If multiple synchronized channels are used (as an example 8 T1 with common clock/sync)
it is recommended to start the channels out of phase in order to load uniformly the bus. This
avoids bus activity peaks when all the channels have to transfer data to/from the memory
simultaneously.
MOTOROLA Chapter 27. Multi-Channel Controllers (MCCs) 27-27