Agilent/Keysight 4951B

The Agilent/Keysight 4951B Protocol Analyzer is a portable diagnostic instrument for installation and maintenance of data terminal and data communication equipment. It monitors and decodes data transmissions, simulates network components, and performs bit error rate testing. The analyzer captures significant data volumes to integral mass storage and features Auto Configure functionality that automatically determines line parameters to initiate monitoring with a single keystroke.

Technical Specifications

Protocols: X.25, SNA, X.21, DDCMP, HDLC, SDLC (NRZI), BSC, IPARS, and character asynchronous or synchronous protocols. Data Codes: ASCII, EBCDIC, Baudot, Six Bit Transcode, IPARS, and EBCD. Memory & Storage: 32 KB RAM for data characters, timing, and lead status. Optional 512 KB tape drive for extended data, timing information, and menu configuration storage. Lead Status Monitoring: Five control leads per interface. RS-232C/V.24 interfaces monitor RTS, CTS, DTR, DSR, and CD. RS-449 interfaces monitor CS, RS, RR, TR, and DM. Character Framing: 5, 6, 7, or 8 information bits plus parity. Asynchronous systems support 1, 1.5, or 2 stop bits per character. Error Detection: CRC-CCITT, CRC-16, CRC-12, CRC-6, LRC, and parity checking. Triggers: 63 programmable trigger events based on characters, errors, interface lead transitions, or timer values. Simultaneous trigger capability to 19,200 bits per second. Timers & Counters: Five independent timers with 1 ms resolution and 65,565 ms maximum count. Five counters each capable of incrementing to 9999. BERT Capability: Simultaneous measurement of bit errors, block errors, errored seconds, and percent error-free seconds. Block sizes of 63, 511, 1000, or 2047 bits. Pseudo-random test patterns of 63, 511, or 2047 bits with single-error and burst-error injection.

Key Features

• Remote data and program transfer via dedicated RS-232C/V.24 port


• External video output through RS-170 port


• Auto Configure for single-keystroke line parameter detection


• Interoperable with HP 4953A and HP 4955A protocol analyzers for remote installation testing

Physical Characteristics Dimensions: 11.2 cm (H) × 25.9 cm (W) × 28.6 cm (D) Weight: 5.7 kg net