BusinessPhone Communication Platform 5.1
System Description ASB 150 02

## General

### What do the terms ASB 150 02, BusinessPhone 50, BusinessPhone 128i and BusinessPhone 250 mean?

ASB 150 02 is the technical system name for a digital telephone exchange (PBX) providing up to 300 digital or analogue extensions, a maximum of 60 digital or analogue trunk or tie line connections to the public or a private telephone network.

The trade name of ASB 150 02 is BusinessPhone, which is available in three models:

- BusinessPhone 50
  Built into a compact wall-mounted single cabinet for systems with a maximum of 64 extensions.
- BusinessPhone 128i
  Built into 1 - 2 19-inch cabinets, which enables mounting in standard industry 19-inch racks, for systems with a maximum of 128 extensions
- BusinessPhone 250
  Built into 1 - 3 wall-mounted cabinets for systems with 200 extensions for office applications and 300 extensions for hotels.

In the following, you will find a general description of the basic functions of the entire system. For more detailed information see the technical documentation collection EN/LZB 103 1233/CD and the various product data sheets.

### Glossary

2B+D |  | ISDN connection to a digital network in the 2x64 kbits + 16 kbits format |
30B+D |  | Connection of digital trunk line, thirty connections (30B+D), with the network exchange |
Adaption |  | Analogue adaption (adaptation) of transmission levels (program-controlled) or selectable by BMS |
ADPCM |  | Adaptive Differential PCM, a method of reducing the amount of transmitted data. Signal history is recorded and the most probable course is estimated. |
ASIC |  | Application specific integrated circuit emulating the MC 6809 processor |
ATIA |  | Continuous adaptation of the hybrid balancing circuit on analog trunk boards featuring increased side tone stability and echo performance. Not to be used on data connection lines. |
AUX_ |  | AUX, AUX2 and AUX3 are device boards to connect I/O devices, e.g. computers, printers |
BBRAM |  | Memory component for "permanent" storage of programs using an internal battery |
BMS |  | BusinessPhone Management Suite. The (BMS) is a fully web based OAM tool for ASB 150 02. |
BS |  | Radio Base Station is connected to the IC-LU and provides the radio link to the portables |
BTU_ |  | Device board for connection of different types of lines to other telephone systems. This board comes in versions: -A,-B,-C,-D,-E |
CAS |  | A signalling format for digital connection to the public telephone network, where a digital connection replaces 30 traditional lines |
CLU |  | Communication line unit is the interface to the base stations |
CM |  | Is a receiver for call metering information (pulses). An optional add-on that is placed on a plug-in daughter board (2 receivers per daughter board). Variants exist for different types of metering pulses: 50Hz, 12KHz and 16KHz. |
CP |  | Central Processor, controls the entire system |
CPU-D_ |  | CPU-D, CPU-D2, CPU-D3, CPU-D4 are central processing unit boards mounted in the first position of the first cabinet providing different memory capacities and I/O connections |
CTI |  | Computer Telephony Integration features call handling via the PC |
DASL |  | Line interface for digital telephones types DBC 6xx, DBC 2xx, DBC199 (8-bit standard PCM) |
DECT |  | Is a harmonised standard for the aerial interface in the 1.8 GHz band |
DID |  | Direct in-dialling. Direct connection to extension without the help of the operator |
DIU |  | Interface circuit board connecting the door phone speaker, microphone, push button and door opener to the exchange |
DPRAM |  | Dual port RAM |
DSLAC |  | Digital/analogue PCM-encoder/decoder (stand. 8 bit PCM) has an integrated "switch"allowing it to be connected to any of the 2 x 64 time slots |
DSM1 |  | Digital Processing Module 1 |
DSP |  | Digital Signal Processor |
DTMF |  | Dual Tone Multi Frequency, a method for transmitting key pad information (digits 0-9 and *,#) as tones on telephone lines |
E2PROM |  | Electrically erasable memory, storing non-volatile system data that is not lost in the event of power failure. Located in the system's database (E2) |
ELU_ |  | Device board for connection of different types of telephones. This board comes in versions: -A,-C,-D |
EPIC |  | Extended PCM Interface Controller |
EPROM |  | Memory component for "permanent" storage of programs |
FECU |  | Feature Enabling Control Unit is available in two versions for the CPUD_ and the IC-CU2 defining the system functionality depending on the FECU index. |
FLASH |  | Enhanced Electrically erasable memory module, storing non-volatile system data that is not lost in the event of power failure. |
GAL |  | Programmable application specific circuit |
HSSC |  | High-speed system communication bus |
I/O |  | Input/output device for connection of peripheral units like computers, printers |
IC-CU2 |  | Integrated Cordless control unit takes care of controlling the DECT cordless system and interfacing to the exchange |
IC-LU |  | Integrated Cordless Line Unit provides communication and synchronisation of the Base Stations. |
IDEC |  | ISDN D-channel Exchange Controller |
ISDN |  | A modern, advanced form of digital connection to the public telephone network |
MPU |  | Multiple party unit, an additional feature of the switch enabling conference for up to 6 parties |
MUSAC |  | Multipoint Switching and Conferencing Unit crossconnects up to 512 incoming to 256 outgoing PCM channels and connects up to 64 conference channels |
OPI |  | Operator instruments, usually known as PC-OPI (PC Operator Instrument) |
PBA |  | Printed board assembly or boards. |
PCM |  | Pulse Code Modulation, a method that is used to encode analogue voice signals into digital form |
PSTN |  | Public telephone exchange (network) |
QDASL |  | Data communication interface for up to four digital system telephones |
QUART |  | Communication circuit for signalling between RP and the telephones |
RAM |  | Data memory |
RASC |  | A PC program for configuration and maintenance support of the PBX. (Has been replaced by the BMS) |
RP |  | Regional Processor, administers device boards |
RSU |  | Register signalling unit (MFE, MFC or DTMF-receiver) |
SPU |  | Signal processing unit for conversion of ADPCM to standard PCM |
Trunk |  | Two or more wire interface to a master exchange |
TSU |  | Tone Sender Unit, is used to generate traffic tones (ring control tone, busy tone, etc.) and DTMF-tones for digit transmission to the public telephone exchanges and other equipment |
VMU |  | Board that stores and reproduces recorded voice information. |

### Structure

#### Hardware

The system comprises a number of printed board assemblies that are interconnected via different common serial busses.

All central control (processing) equipment is located on the CPU-D_ board, together with support functions that are needed in all variants of ASB 150 02.

Several boards with the appropriate interfaces are available to connect equipment (e.g. telephones, other telephone exchanges, computers, printers) to the system.

The functionality of each device board provides the possibility to have several types of interfaces, It is possible for example to mix telephone connections, V.24 ports and external tie lines on one board.

The regional processors report (on system start) to the central processor what types of boards are installed in the system, their positions and how many individual lines each board is equipped with, so that the central software "knows" the configuration of the installed system.

#### Software

The system software is structured in accordance with the hardware.

- A central program controls the telephone traffic's switching logic as well as operation & maintenance functions. The central program package is divided into a number of program blocks, each specialised for a certain task, e.g. extensions (telephones), external traffic (trunks), operation & maintenance, call metering. Each program block is divided into units with clearly defined functions within the block. Each program block administers its own data.
- A number of regional programs, one for each type of device board. The regional programs also consist of one or more program blocks with separated tasks and local data.

The program units communicate with one another by sending messages (signals). It is the central operating system's main task to distribute messages to the various parts of the system and to queue messages that are waiting to be executed.

Revision: M © Ericsson Enterprise 2003