Co Card; Dsp Card; Hard Disk Drive; Cpu Card - Panasonic KX-TVP150E Overview

2.1 What is a System Configuration?

2.1.1 CO Card

2.1.2 DSP Card

2.1.3 Hard Disk Drive

2.1.4 CPU Card

Manager's Guide
The telephone line interface (CO card) transmits and
receives analogue signals to and from the telephone line.
The analogue input signal is digitized at a sampling rate of
8kHz to create an 8-bit digital signal.
The CODEC facility is on the DSP card and consists of two
digital signal processors (DSP) and voice buffer. When a
user calls the VPS, one of the DSPs compresses the digital
signal sent from the CO card. The compressed signal is
stored in a voice buffer, then written to the hard disk. When
a message stored on the hard disk is played back, the DSP
first decompresses the stored data and the resulting signal
is then sent to the CO card.
The hard disk drive is connected to the central micropro-
cessor via a SCSI interface. The hard disk stores the
proprietary system program, the system administration table
and the voice prompts (about 40 minutes' worth). In
addition, it has the capacity to record approximately 18
hours of recorded messages from callers.
The CPU Card comprises the central microprocessor, ROM,
dynamic RAM, the clock generator for the time-sharing
switch, a Rotary switch, an RS-232C interface and a SCSI
host adaptor.
The central microprocessor communicates with and controls
the sub-microprocessors on the CO card and DSP cards via
FIFO memory.
The system ROM stores ROM-based system programs, self-
diagnostic software, test programs and backup programs.
Application programs and the system administration table
from the hard disk are read into dynamic RAMs for use by
the system.
The Rotary switch on the CPU card is used, for example,
when performing initial parameter settings. There are 10
Configuration & Installation
M-2-5