Toshiba Strata CT, Installation & Maintenance Manual

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Strata CT Installation
Strata CT I&M Manual October 2000
2-37
BCU Processor PCBs
System Type: Strata CT Base Cabinet
Current Version: B1CU, B2CAU/B2CBU, B3CAU/B3CBU, B5CAU
Older Version(s): None
The common control unit provides centralised control for the system. It incorporates a 16 or
32 bit, 68000-type microprocessor and contains a custom time switch and conference Large
Scale Integration (LSI) circuitry.
The processor operating software is programmed on four read-only-memory (ROM) chips on
the B1CU, B2CAU, B3CAU, B5CAU PCBs. The B5CBU also has a flash memory PCB
(BMMS). The operating software (ROM or BMMS) is factory-installed.
The BCU common control units interface with optional BRCS DTMF receivers, feature keys
(RKYS 2, 3 or 4) for Auto Attendant (AA), Automatic Call Distribution (ACD), Management
Information System (MIS) for ACD, Toshiba proprietary RS-232 and SMDI voice mail
interfaces.
PCB Installation Power Supply Considerations
1. The power supply must be Off whenever removing or installing the processor PCB—
B1CU, B2CAU/B2CBU, B3CAU/B3CBU, and B5CAU PCBs (see
Figure 2-2 ).
2. It is recommended that the power supply be Off, whenever possible, when removing or
installing the other PCBs.
Maximum Capacities
Configurations for a fully-expanded system can range from 200 lines/ 336 stations.
Additionally, each of the common control units can support a separate set of features. Refer
to
Chapter 1 – Strata CT Configuration for more information.
Each of the common control units may be equipped with an BRCS (4, 8, or 12) to interpret
Dual-Tone Multi-Frequency (DTMF) signals transmitted from Tie/DDI lines, built-in AA and
standard telephone ports. The common control units also provide an interface (along with a
volume control) for a Music-on-hold (MOH)/Background Music (BGM) source.
BCU PCBs are described later in this chapter.
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