HP / Agilent 37721A Digital Transmission Analyzer

The HP/Agilent 37721A Digital Transmission Analyzer is a portable, rugged test set for bit and code error testing of European CEPT digital communication systems. It delivers comprehensive error performance measurement to CCITT Recommendation G.821 standards, with graphical display of error counts, error seconds, and alarms. The instrument combines field-proven reliability with operator convenience through autosetup configuration and nine programmable setups for rapid parameter access.

## Technical Specifications

• Supported data rates: 704 kb/s, 2.048 Mb/s, 8.448 Mb/s, 34.368 Mb/s, 139.264 Mb/s (European CEPT)
• Measurement capabilities: bit error testing, code error testing, FAS error testing
• Error performance standard: CCITT Recommendation G.821
• Interfaces: G.703, RS-232, HP-IB
• Timing recovery: Available at 704 kb/s and 2.048 Mb/s from received data
• Clock offset (Option 003): ±100 ppm around standard rates
• Power requirements: 115 V (+10% -22%) or 230 V (+10% -18%), 48 Hz to 66 Hz

## Key Features

• Autosetup facility automatically configures to incoming data
• Nine stored setups enable instant recall of test parameters
• Graphical display with real-time error visualization
• Data pattern generation and reception across supported rates
• Internal or external printer output for result documentation
• Lightweight, portable design for field deployment

## Optional Capabilities

• Option 002: Multiple outputs (four total)
• Option 003: Transmit clock offset

## Compatibility & Integration

The 37721A complies with CCITT Recommendation G.821 and G.703 interface standards, enabling integration into European telecommunications test environments. RS-232 and HP-IB control interfaces support both manual operation and automated test sequences.