Agilent/Keysight J1420B

The Agilent/Keysight J1420B is a VXI receiver module for SDH/SONET signal analysis at 10 Gb/s. Operating as a C-size, three-slot component, it receives framed STM-64/STS-192 signals via optical interface and integrates with the J1421A clock source and J1422B transmitter to form a complete SpectralBER system. The module delivers precise bit error rate and optical signal-to-noise ratio measurements for short-reach optical applications.

Technical Specifications

• Data Rate: 9.953 Gb/s (STM-64/STS-192)


• Optical Interface: SC or FC/PC connector, 1260 nm to 1620 nm wavelength range


• Receiver Sensitivity: −13.5 dBm


• Maximum Input Power: +6 dBm


• Optical Power Measurement Range: −60 dBm to +6 dBm


• Optical Return Loss: > 28 dB


• Detector Type: InGaAs (Indium Gallium Arsenide)


• Form Factor: C-size, three-slot VXI module

Key Features

• Monitors J0 and J1 section trace messages for SDH/SONET signal integrity


• Performs G.826 and G.828 error analysis per ITU standards


• Supports PRBS pattern-based bit error testing


• Measures both BER and OSNR with high repeatability


• Wide optical power measurement range accommodates diverse link budgets

Typical Applications

• Short-reach optical signal characterization and validation


• SDH/SONET alarm and performance monitoring


• Optical transceiver and receiver module testing


• Network equipment commissioning and troubleshooting

Compatibility & Integration Designed for VXIbus architecture, the J1420B operates as the receiver component of the 10 G SpectralBER system. Requires the Agilent J1421A clock source module and Agilent J1422B transmitter module for full system operation. The module is obsolete but continues to receive vendor support.