The ST2400A is the first STM-16/OC-48 test product optimized for testing 2.488-Gbps Dense Wavelength Division Multiplexed (DWDM) client systems. Its compact size, flexibility of configuration, choice of operating modes, unique I/O features, extensive software driver support, and range of error- and defect-inject capabilities make it particularly effective for DWDM system test during production and installation. It can also be used in non-DWDM SDH and SONET test applications. The ST2400A is payload independent, external SDH/SONET 155-Mbps optical and electrical and 622-Mbps optical signals are supported in add/drop mode. The ST2400A can be ordered as an ST2400A Transceiver, as an ST2400R Receiver, or as an ST2400T Transmitter to meet a wide range of application needs economically. Features Optimized for Dense Wavelength Division Multiplexing (DWDM) Transmission Quality Testing Available in Transceiver, Receiver, and Transmitter-Only Versions Tributary Testing of STM-64/OC-192 Systems Easily Switchable to/from SDH/SONET Optical Tributary Payload Add/Drop with Payload Independence External Sync Reference for Timing Coordination Active Through Mode to Simulate Fault Conditions on Installed Networks Compact and Light Weight for Production and Installation Test A Variety of Optics Options, Including No Optics Emulates Network Elements Transmitting Live Traffic