The HP/Agilent 3781B Pattern Generator is a digital test pattern source designed for evaluation and stress-testing of digital communication systems across North American hierarchies. It generates programmable PRBS and WORD patterns with selectable data rates and lengths, supporting both binary and coded outputs in AMI or HDB3 formats. The instrument provides precise error injection—single shot, 10⁻³ rate, or 10⁻⁵ rate—into PRBS and 16-bit WORD patterns to validate line terminating equipment performance. A dedicated jitter modulation input allows controlled jitter injection for interface tolerance characterization.
## Technical Specifications
• **Pattern Types**: Pseudo-Random Binary Sequence (PRBS) and programmable WORD patterns
• **Code Support**: AMI and HDB3 coded outputs
• **Error Injection**: Binary and code error injection; single shot, 10⁻³ rate, or 10⁻⁵ rate modes
• **Data Interfaces**: DS1, DS1C, DS2, DS3
• **Binary ECL Output**: Up to 50 Mb/s
• **Control Interface**: HP-IB for remote/automated operation
• **Jitter Modulation**: Dedicated input for jitter tolerance testing
• **Dimensions**: 16 x 14 x 10 inches
• **Weight**: 25 lbs
## Key Features
• Programmable pattern length and data rate control
• PRBS generation for live traffic simulation
• Shorter WORD patterns for transmission equipment sensitivity analysis
• Multiple error injection rates and modes for comprehensive stress testing
• Integrated jitter modulation for interface characterization
## Typical Applications
• Digital communication equipment testing and qualification
• North American digital hierarchy system validation
• Cable, digital radio, satellite, and lightwave transmission system testing
• Line terminating equipment stress and margin analysis
## Compatibility & Integration
Bell-compatible operation. Pairs with the HP/Agilent 3782B Error Detector for integrated error measurement and pattern generation systems.
