Hardware manual

Electra Elite Issue 8
System Hardware Manual 5 - 7
SECTION 3
C
OMMON CONTROL
U
NITS The Electronic Telephone units described in this section control the
common functions of the KSU.
3.1 CPUB( )-U( ) ETU
3.1.1 Description
The CPUB( )-U( ) ETU is the Central Processing Unit for
the system. This ETU has a Central Processing Unit and
a Microprocessing Unit and supports a maximum of 192
ports for the Electra Elite system.
A 32-bit microprocessor executes the programs stored on
the Flash ROM ICs of the MPU unit. This controls the
entire system when data is transferred to and from other
ETUs.
This ETU provides the following items:
Time Division Switch (TDSW)
Static Random Access Memory (SRAM)
32-bit Processor
4-channel DTMF Receiver (PBR)
Sixteen 4-party Conference Circuits
Internal (digital music) Music-on-Hold source
External Music-on-Hold input (also used for station
background music)
Flash ROM
Call Progress and DTMF Tone Generator
Memory Backup Battery (Retains memory for
approximately 21 days)
Key Function (KF)/Multifunction (MF) Registration