Partitions and trigger supervision in Aleph

The Aleph data acquisition system is controlled by a set of protocols that are implemented both in software and on dedicated hardware. The authors describe these protocols, how they fulfil the design requirements, and the specific hardware supporting them. In particular, they give an overview of the Aleph readout and describe the readout controller, the transmission of trigger signals, the readout procedure, and the cable protocol. The authors discuss the requirements for partitioning Aleph, the topology constraints, and resource management. They detail the trigger supervisor, its functions, and the handling of errors