Agilent / Keysight E1663A Electrical Interface Module

The Agilent/Keysight E1663A is a 1-slot C-size VXI electrical interface module designed for the HP Broadband Series Test System. It has bidirectional SONET/SDH signal conversion between optical line interface modules and devices under test, handling data rates of 155.52 Mb/s or 52 Mb/s in Binary Coded Mark Inversion (CMI) format. The module performs automatic clock recovery from incoming data and applies real-time compensation for cable loss and signal degradation, ensuring signal integrity across the test interface.

Technical Specifications

Data Interface

• Data rates: 155.52 Mb/s or 52 Mb/s


• Data format: Binary Coded Mark Inversion (CMI)


• Electrical input: 75 Ω unbalanced, BNC connector


• Maximum input amplitude: 0.5 Vpk


• Input withstand voltage: ±5 V


• Open and short circuit protection included


• Transmit clock input: ECL, SMA connector, 50 Ω termination to -2 V dc nominal


• Transmit data input: Binary NRZ format, SMA connector Physical Characteristics


• Form factor: 1-slot C-size VXI module


• Dimensions: 12 × 10 × 8 in


• Weight: 10 lbs Environmental Specifications


• Storage/shipment temperature: -40°C to +75°C


• Humidity: 50% to 95% RH (25°C to 40°C)


• Altitude: Up to 4 (unspecified units)

Key Features

• Automatic clock recovery from received data streams


• Adaptive signal compensation for cable loss and attenuation


• Signal encoding to DUT-required levels and formats


• ACCESS LED: VXIbus backplane activity indicator


• SIGNAL LED: Input signal presence indicator


• Dual-rate capability supports both 155 Mb/s and 52 Mb/s SONET/SDH applications

Typical Applications Opto-electronic test and verification in broadband telecommunications systems. Electrical-to-optical and optical-to-electrical signal interface bridging for SONET/SDH protocol compliance and characterization.

Compatibility & Integration Integrates with HP Broadband Series Test System architecture. Partners with HP E1697A (155 Mb/s optical line interface) and HP E1617A (52 Mb/s optical line interface). Module communication via SMA-to-SMB RF adaptor cables.