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Glossary
QRCU2 ~ RCOS
Strata DK Programming 5/00 GL-7
Glossary
QRCU2 DTMF Receiver/ABR Tone Detector Unit (DK14)—Provides three circuits to receive DTMF
tones (required for DISA and devices connected to QSTU2s), and three circuits to detect
busy tone (required for the ABR feature).
RAM Random Access Memory—Refers to the type of system memory that holds individual system
configuration and feature programming. RAM is read/write memory, and can be easily
revised in programming.
RATU Attendant Console Interface Unit—Optional PCB that can support up to four attendant
consoles and/or PC attendant consoles.
RBDB Battery Distribution Box—Interface used to connect reserve power batteries to systems with
three or more cabinets (also provides six RBTC1A-1.5M cables to connect RBDB to cabinet
RPSU280 power supplies).
RBSU ISDN Basic Rate Interface (BRI) Unit—Provides two circuits, each of which provide two
simultaneous voice and/or data connections with a single interface. BRI uses the 2B+D
transmission format which is defined as two 64-kbps bearer channels and one 16-kbps data
(control channel). Available for DK424 with Release 4.1.
RBSS ISDN Basic Rate Interface (BRI) Subassembly—Attaches to the RBSU to provide two
additional BRI “U” circuits that can be used to connect to Network BRI lines and/or station-
side connections only. Available for DK424 with Release 4.1.
RBTC1A-2M Battery cable that connects reserve power batteries to RBDB battery distribution box (3 or
more cabinet installations).
RBUU ISDN Basic Rate Interface (BRI) Unit—Provides two BRI “U” circuits. Each circuit provides
two simultaneous voice and/or data connections with a single interface. BRI uses the 2B+D
transmission format which is defined as two 64-kbps bearer channels and one 16-kbps data
(control) channel. Available for DK424 with Release 4.2.
RBUS ISDN Basic Rate Interface (BRI) Subassembly—Attaches to the RBUU to provide two
additional BRI “U” circuits that can be used to connect to Network BRI lines and/or station-
side connections only. An RBUU with the RBUS subassembly provides four BRI “U” circuits
in one card slot. Available for DK424 with Release 4.2.
RCMS Enhanced 911 (E911) CAMA Trunk Direct Subassembly—Enables the DK424 (Release 4.0
and above) to connect to one or two CAMA trunks. Two RCMS PCBs enable connection to
four CAMA trunks.
RMCU Enhanced 911 (E911) CAMA Trunk Direct Interface—Enables connection from the DK424
(Release 4.0 and above) to E911 locator services without third-party equipment. The RMCU
supports two subassemblies (RCMS) that provide a total of up to four ports.
RCCB Conduit Connection Box—Device required for floor-mounted systems with three or more
cabinets to connect AC power and reserve power battery cabling to the system. Cabling from
the AC power source and from the reserve power battery source can only be installed by a
licensed electrician.
RCIU2/RCIS Four-circuit plug-in PCB/four-circuit piggy-back PCB, each of which receives and decodes
FSK Caller ID (CLID or CND) information from the Central Office ground or loops Caller ID
lines. Each RCIU/RCIS circuit works in conjunction with a DK424 RGLU/RCOU/RCOS line
PCB circuit.
RCOS Loop Start CO Line Interface Subassembly—Optional subassembly that attaches to the
RCOU PCB to provide four additional CO analog line circuits to the PCB. Supports Caller ID
when used with RCIU/RCIS circuits.
Term Definition