The E1618A 622 Mb/s Optical Line Interface provides OC-12c (SONET STS-12c and SDH STM-4c) access to the system under test via SC optical connectors. The E1618A is a single-mode device that can also be used with multi-mode systems when the appropriate attenuator is fitted. Product features include full-rate 622 Mb/s SONET/SDH generation and analysis; SONET/SDH transport overhead building, generation, error injection, capture, and save/load; Alarm generation and detection ; BIP error injection and detection ; Payload pointer stressing; Trace message generation & capture; Automatic REI alarm generation; Graphing and logging of real-time statistics for correlation of multiple measurements; Tcl and C-scripting automated test environment (UPE); and Optical and Electrical 622Mb/s interfaces. Works with the E1609A Cell Processor.