ESOR is a USA based company, specializing Bit Error Rate Testers (BERT) used in Telecomm industries to measure data link integrity and the ability of a transceiver, receiver or transmitter to accurately send and receive signals ideally doing so error free.

The models 1504 and 2904 Gb/s Pulse Pattern Generator and Error Detector products have been exceeding customer expectations while balancing low cost with excellent performance. Custom-Cal is the sole provider of calibration services to ESOR and its growing customer base.