The Agilent/Keysight 4955A is a protocol analyzer for capturing, analyzing, and simulating network traffic across multiple communication protocols and interfaces. It identifies and resolves network issues to ensure optimal performance, making it essential for data communication network testing and troubleshooting.
Technical Specifications
Data Rates & Performance
• Maximum transmission rate: 19,200 bits per second
• Simultaneous triggering: up to 19,200 bits per second
• Capture memory: 32 KB RAM for data characters, timing, and lead status
• Optional tape drive: 512 KB storage for data, timing information, and configurations
Protocol & Data Code Support
• Protocols: X.25, SNA, X.21, DDCMP, HDLC, SDLC (NRZI), BSC, IPARS, character asynchronous and synchronous
• Data codes: ASCII, EBCDIC, Baudot, Six Bit Transcode, IPARS, EBCD
• Character framing: 5, 6, 7, or 8 information bits per character with parity; 1, 1.5, or 2 stop bits (asynchronous)
• Error checking: CRC-CCITT, CRC-16, CRC-12, CRC-6, LRC, and parity
Control & Monitoring
• Lead status monitoring: Five control leads (RTS, CTS, DTR, DSR, CD for RS-232C/V.24; CS, RS, RR, TR, DM for RS-449)
• Trigger types: 63 available, including characters, errors, interface lead transitions, and timer values
• Timers: Five independent timers with 65,565 ms maximum count and 1 ms resolution
Display & Output
• Display: 12.7 cm (5 inch) diagonal, 16 lines × 32 characters per line
• Formats: DTE over DCE, Data and Lead State, DTE only, DCE only, Frame and Packet decode
• Send strings: up to 255 characters per string; 1,750 characters total
Bit Error Rate Testing (BERT)
• Simultaneous measurement: bit errors, block errors, errored seconds, percent error-free seconds
• Block sizes: 63, 511, 1,000, or 2,047 bits
• Patterns: 63, 511, 2,047 bit pseudo-random sequences
• Error injection: single errors or burst errors
Physical & Environmental
• Dimensions: 11.2 H × 25.9 W × 28.6 cm D (4.4 × 10.2 × 11.3 inches)
• Net weight: 5.7 kg (12.6 lb); Shipping weight: 9.5 kg (21 lb)
• Operating temperature: 0°C to +55°C (32°F to 131°F)
• Storage temperature: -40°C to +75°C
– Key Features
• Five control lead monitoring for RS-232C/V.24 and RS-449 interfaces
• 63 configurable trigger types for precise capture control
• Multiple error detection algorithms including CRC variants and LRC
• Remote control via rear panel RS-232C/V.24 port or interface pod
• Comprehensive BERT with error injection capabilities
– Compatibility & Integration
The 4955A integrates with the Agilent 4951B protocol analyzer and 4953A for expanded testing capabilities.
