Specifications

CHAPTER 1. Introduction To System

1-8

1.3 Technology

1.3.1 Switching

System switching is accomplished by means of a custom IC ‘engine’ that provides 256

switchable digital channels. The engine is controlled by its own 16-bit Motorola



68000 microprocessor 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 mentioned above, the systems also utilize DSP. 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 4 DSP channels.

Four additional DSP are added when a MISC card is installed. This means that the system

contains a total of 8 DSP channels when fully expanded. The DSP channels are fully shared

throughout the system as a common resource.

1.3.2 Memory

The systems operate using stored program control. This program is stored in EPROM chips

or flash memory. All specific customer data is stored in RAM(Random Access Memory)

which is protected against the loss of AC power to the system by an on-board battery

backup system.

The OfficeServ 100 program is stored on a 16 Mbytes NAND flash memory on the Main

Control Processor(MCP1) card. The system boots from a 512 Kbytes boot ROM and

downloads the operating program into 32 megabytes of SDRAM on the MCP1 card.

The customer database is stored in 1 Mbytes of non-volatile SRAM.

1.3.3 Microprocessors

OfficeServ 100 uses distributed processing. The primary processor of the system is a 16-bit

Motorola MC68000 operating at a clock speed of 16 MHz. Secondary processing is in

the some special cards like as BRI and also done in the keysets. The digital keyset uses a

Hitachi H8 processor for data communication within the OfficeServ 100.

The OfficeServ 100 uses distributed processing. Its primary processor is a 32 bit Motorola

MPC855 operating at a clock speed of 50 MHz on the MCP1 card.

These secondary processor are MC68EC000 processor(008 Base Board) running at 16

MHz and provide local control of cards.