Use this option to specify the clock source for the T1 PCB. The clock is required to synchronize the PCB’s operations. The PCB can be either the clock master (1) or the clock slave (2). As master, the T1 PCB uses its own internal clock as the clock source. As slave, the T1 PCB uses the connected T1 circuit from the telco as the clock source.
When setting up Tie Lines, keep track of your clock sources. For example, if the local system is the clock master, the remote system should be set for slave so it uses the connected circuit as the clock source.