This read-write object drives the sequence of SET operations used to run a Bit Error Rate Test (BERT) on this Service Module: acquireBert reserves the BERT hardware resources, cnfBert configures the test parameters, startBert begins the configured test, and modBert changes parameters on a test already running. The described sequence must be followed in order, meaning this single object serves as the command channel for the entire BERT state machine on the card. An admin running a line-quality test on a T1/E1 port would issue acquireBert, then cnfBert with the desired pattern and medium, then startBert, using this same object for each step.