NonStop System Glossary

root mean square (rms)

A measurement method used to determine the direct current (DC) equivalent value for alternating

voltage and current waveforms. The rms method refers to the process of sampling a waveform,

squaring the samples, averaging the samples (mean value) over the period from one cycle, and

then calculating the square root of the samples. In general, rms-sensing devices are more accurate

than averaging meters. Measurements from averaging meters can be as low as 30 percent of the

actual current for loads with high crest factors.

root user

See super ID.

router

See ServerNet router.

router 1

See ServerNet router 1.

router 2

See ServerNet router 2.

router 3

See ServerNet router 3.

See register pointer (RP).

RPC

See Remote Procedure Call (RPC).

RS-232

An industry standard for serial data transmission. It describes pin assignments, signal functions,

and electrical characteristics. The current standard specifies a 25-pin connector.

RS-449

An industry standard for serial data transmission. It specifies pin assignments, signal functions,

electrical characteristics, and a 37-pin connector with an optional 9-pin connector for a secondary

channel.

run-time data unit (RTDU)

The region of a TNS object file used to store SQL/MP source and object code. It contains embedded

SQL information for clients of SQL/MP. Source RTDUs are created when a program file using

embedded SQL/MP is initially compiled and linked. Object RTDUs are added to the program

when the file is SQL-compiled.

run-time linker

See linker.

run-time loader

See loader.

R 161