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.