Features:

The 4951B is compatible with the HP 4953A and 4955A

• 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
• Capture memory: 32 KB Ram stores data characters, timing, and lead status information
• Optional tape drive: 512 KB - store data, timing information, menu configurations
• Lead status: The status of five control leads are stored for each interface—RTS, CTS, DTR, DSR, and CD for RS-232C/V.24 and CS, RS, RR, TR, and DM for the RS-449 interface
• Character framing: 5, 6, 7, or 8 information bits, plus parity. For asynchronous systems, select 1, 1.5, or 2 stop bits per character
• Error checking: CRC-CCITT, CRC-16, CRC-12, CRC-6, LRC, and parity
• Triggers: 63, consisting of characters, errors, interface lead transitions or timer values. Can be simultaneously active up to 19200 bits per second
• Timers: Five, each with a maximum count of 65565 ms, resolution 1 ms
• Keyboard: Full ASCII keyboard with six softkeys and cursor control
• Display: 12.7 cm (5 inches) diagonal with 16 lines and 32 characters per line
• Display formats: DTE data over DCE data, Data and Lead State, DTE data only, DCE data only, and Frame and Packet decode
• Send strings: 255 characters per string maximum; 1750 characters total
• Remote capability: Separate rear panel RS-232C/V.24 port or use the interface pod
• Bit Error Rate Testing: Simultaneously measure bit errors, block errors, errored seconds, and percent error free seconds
• Block size: 63, 511, 1000, or 2047 bits
• Patterns: 63, 511, 2047 bit pseudo random sequence
• Character framing: Select 5, 6, 7, or 8 bits per character and parity
• Inject error function: Inject single errors or bursts of errors

The HP 4951B portable datacommunications protocol analyzer is used for monitoring and decoding data transmissions, simulating network components, performing bit error tests and remotely transferring data and programs through a separate RS-232C/V.24 port. External viewing is supported via a standard RS-170 video port.