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Glossary
RCOU ~ RPSU280
GL-8 Strata
RCOU CO Line Interface Unit—An optional PCB that provides the system with four loop start CO
lines. An optional RCOS subassembly can be attached to the RCOU for four more loop start
analog CO lines. Supports Caller ID when used with RCIU/RCIS circuits.
RCTU Common Control Unit—The system’s controller PCB that contains the system's main
microprocessor and microprocessor bus, ROM, RAM, time switch logic, busy tone detectors,
system tones and MOH/BGM Interface. RCTUs include: RCTUA, RCTUB, RCTUBA/BB,
RCTUC/D, and RCTUE/F. Each RCTU supports different station and line capacities. The
RCTU PCBs also provide interface for the optional RRCS PCB and RKYS key.
RDDU Direct Inward Dialing Interface Unit—Optional PCB that provides four analog Direct Inward
Dialing line circuits. Supports ANI and DNIS.
RDSU Digital/Standard Telephone Interface Unit—Optional PCB that provides two standard
telephone and four digital telephone circuits in its basic configuration. An RSTS can be
attached to the RDSU for two additional standard telephone circuits.
RDTU T1/DS-1 Interface Unit—Optional PCB that provides up to 24-digital channels that can
individually be assigned for loop start CO line, ground start CO line, E & M tie line, or DID line
operation. Supports ANI and DNIS.
REMU E & M Tie Line Unit—An optional PCB that provides the system with support for four E & M
Type I or Type II, Immediate or Wink Start tie lines. Supports ANI and DNIS.
RFIF Floor Mount Installation Kit—Kit that is used to floor mount systems.
RGLU Analog Ground/Loop Start CO Line Interface Unit—Provides four CO line circuits that can be
individually configured for loop start or ground start CO line operation. Supports Caller ID
when used with RCIU/RCIS circuits.
RKYS Feature Key Upgrade—Subassembly that attaches to the common control unit to provide the
system with optional features. There are four versions of the RKYS: the RKYS1, the RKYS2,
the RKYS3 and the RKYS4, each of which provides a distinct set of features.
RMDS Remote Maintenance Modem Subassembly—A subassembly installed on the RSIU Optional
Interface Unit that allows the system to be connected with a remote administration/
maintenance terminal or DK Admin/DK Backup personal computer.
RPCI-DI Computer Data Interface Unit—Replaces the normal telephone base and provides all the
functions of PDIU-D12. In addition, it can be switched to a second mode automatically and
used with a Telephone Application Program Interface (TAPI) software application.
RPTU ISDN Primary Rate Interface (PRI) Unit—Provides 1 data (control) channel and 23 bearer
channels.All B-channels appear and program as CO lines in the DK424 system and can be
individually configured for local service, FX, WATS, DID, tie, etc., service operation.
Supported by the RCTUBA3/BB4, RCTUC3/D4 and RCTUE3/F4.
ROM Read Only Memory—Refers to the type of system memory that holds static software that
comprises the mechanics of the features’ functions. ROM is only revised by Toshiba software
engineers.
RPSB (1 and 2) Power Strip—Interface between cabinet power supplies and the commercial AC power
source. The RPSB provides outlets for three power supplies. One RSPS is required for
systems with three or four cabinets, two or three RSPSs for five- or six-cabinet systems.
RPSU280 Cabinet Power Supply—Furnishes power to all of the stations and peripherals connected to
the cabinet PCBs. Each Base and optional expansion cabinet has a separate power supply.
Term Definition