The baseline T-BERD 950 Communications Analyzer is a T J FTI BER test set that offers several options that enable it to become a full featured multi-service test instrument. It has two T1 interfaces: T1-LINE and T1- EQUIPMENT. Each interface consists of an independent receiver and transmitter. The interfaces can be configured for various applications. The two (1) T1 interfaces work to access different external interface connectors.