Specifications

CONTENTS
1–5
Adding one expansion cabinet makes this a two cabinet system with 13 universal card
slots (see Figure 1–2). This allows a maximum of 116 stations or 112 lines when using a
T1 card. Without the T1 card, the maximum number of lines is reduced to 104.
THREE CABINET SYSTEM
In a fully expanded three cabinet system, there are 20 universal card slots (see Figure 1–3).
This allows a maximum of 172 stations or 168 lines when using a T1 card. Without the T1
card, the maximum number of lines is reduced to 160.
1.4 TECHNOLOGY
SWITCHING
System switching is accomplished by means of a custom IC “engine” that provides 256 swit-
chable digital channels. The engine is controlled by its own 16 bit Motorola MC 68000 micro-
processor and switching control program. Each of the 256 digital channels is automatically
assigned to carry voice or data as required by system operation in a PCM format.
In addition to the 256 channels, the system also utilizes Digital Signal Processors (DSPs).
Each DSP may be configured by the switching control program as a DTMF sender, a
DTMF receiver or as a C.O. tone detector on a per-call basis. Each engine chip contains
four DSP channels. Single engine chips are located on the KSU and EKSU motherboards
with a pair of engine chips located on the Expansion A and Expansion A1 cards. This
means that the system contains a total of 20 DSP channels when fully expanded. The
DSP channels are fully shared throughout the system as a common resource.
MEMORY
The system operates using stored program control. This program is stored in two EPROM
chips (ROM) totaling 1024 kilobytes of memory. However, if the system is configured for
operation with Caller ID, the program size is 2048 kilobytes contained in four EPROMs. All
specific customer data is stored in 512 kilobytes of non-volatile random access memory
(NV-RAM) on the main KSU motherboard. It is protected by a super capacitor providing
seven days of memory protection in the event of loss of AC power to the system.
MICROPROCESSORS
The DCS uses distributed processing. Its primary processor is a 16 bit Motorola MC68000
operating at a clock speed of 8 MHz. The secondary level of processing is on the cabinet
motherboard. This is another MC68000 processor and provides local control of the 256
PCM channels via the engine chip. The tertiary level of processing is done in the keysets.
The digital keysets use a Hitachi H8 processor for data communication within the DCS.
1.5 PROGRAMMING
The DCS is a self-configuring system. This means that immediately after applying power,
the DCS reads the types and locations of all installed cards and telephones and assigns
default data to them. This data provides for system operation within a minute after apply-