Agilent Technologies J3972A Protocol Data Unit PDU, Pseudo-Random Bit Sequence Prbs, Ring

Protocol

A set of rules that governs data transfer among devices on a network. A protocol identifies the handshake type, frame size and format, timing, error recovery scheme, word size or other characteristics of each transfer, depending on the system.

Protocol Data Unit (PDU)

A segment of data generated by a specific layer of a protocol stack; usually contains information from the next higher layer encapsulated with header and trailer data generated by the later in question.

Pseudo-Random Bit Sequence (PRBS)

These are sequences of bits used for BERT testing. To simplify testing, certain lengths are standardized to particular sequences. For high-speed ATM, the standard supported lengths are 2^15, 2^20 and 2^23. The length is the number of bits which will be transmitted before the sequence repeats.

Remote Alarm Indication (RAI)

The Remote Alarm Indication (RAI (Yellow)) is a 1-bit field in the Path Status octet (G1) of a PLCP frame. An RAI value in a PLCP frame is set to 1 after an error condition has been detected. The RAI is cleared (0) after the error condition has not occurred for a certain period of time.

Ring

See Token-Ring.

RMON MIB (Remote Network Monitoring MIB)

The collection of objects defined by the Internet Engineering Task Force in RFC 1757, RFC 1213, RFC 1157, RFC 2021, RFC 2074, Token-Ring RMON Extensions, and Agilent probe private MIB that are used for network monitoring.

RS-232 port

A serial interface connector on a computer or peripheral that adheres to the current RS-232 standard. The probe’s RS-232 port adheres to this standard.

SAM (System Administration Manager)

A configuration tool provided by HP-UX for managing system resources and changing configuration parameters.

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