BusinessPhone Communication Platform 4.0
Fault Tracing ASB 150 02 > General

## Definitions

#### Blocked Printed Board Assembly (PBA)

A blocked PBA is normally unable to process traffic. The state of the board is indicated on the board's LEDs (see Indication of LEDs on board(s)) and read outs of revision (R)-states is made via RASC where the board position is indicated (marked).

See user guide for RASC-menu MAINTENANCE-HW/SW-RP.

#### Blocked directory number

An individual whose directory number has been blocked cannot generate nor receive traffic. A blocked directory is not indicated on the LEDs of the device board. See RASC-menu CONFIGURATION.

#### Cold start

Cold start denotes a restart of the PBX, whereby all programmed data is erased and replaced by default values initially assigned e.g. factory.

Cold start is performed by placing a strap in the socket provided for this purpose on the front of CPU-D_ (see Indication of LEDs on board(s)) and thereafter switching off and on the DC supply voltage to the cabinet containing CPU-D_. Instead of switching the PBX OFF and ON again two pins are available in connector field 2 on the CPU-D_ which can be short circuited by a plug to invoke restart (refer to System reset).

#### CSM

The Cordless System Manager is a maintenance and configuration software program for the Integrated Cordless System. A PC with CSM software installed can connect directly to a CPU-D4 on a maintenance port or remotely via internal modem (similar as with RASC) but as in the past it is also possible to connect CSM directly to the IC-CU_ or via an external modem.

#### CPU

The central processor unit and its programs.

#### Device

The PBX can be considered as an interworking unit of function blocks. Such a function block is sometimes called a "device".

Examples of devices are: switch, tone sender, extension, trunk, MFC-register and voice memory.

The placing of the devices on PBAs is arbitrary.

#### Facility

The functions of a telephone exchange are called facilities. Often a facility consists of several connection cases. A connection case is initiated by means of a certain procedure from a telephone or other unit (equipment) connected to the exchange.

Examples of facilities are: internal call, external call, inquiry, transfer, intrusion, conference, sector paging, various types of diversion, programming of function keys and abbreviated numbers.

#### Hot swapping

A board of the PBX can be exchanged during operation by a board of the same type and with the same number of individuals. The board can be disabled for traffic (by RASC) prior unplugging it and the new board is put in operation without the need of restarting the exchange. A new board can be inserted in a free slot and put in operation.

#### Individual

An individual member (unit) of a group. The PBX possesses, among others, groups of extensions where an individual can connect a telephone.

On analogue trunks each individual can connect (is connected) to a trunk.

On digital trunks several individuals share a single line (cable/interface).

#### Installed PBA

A PBA is correctly installed if it is physically mounted in a board position stipulated in the appropriate installation instructions. A correctly installed PBA is a prerequisite for traffic.

See the guide text for RASC-menu MAINTENANCE-HW/SP-RP.

The LEDs on the board identify different board conditions. An explanation of the conditions is given under Fault locating.

#### Line network with stubs

Extension line with extra jacks in the form of a star network. See figure below.

#### Line signalling diagram with line test

Several line signalling diagrams for trunks include a line test that is done for both outgoing and incoming calls. These tests are described in RASC, RASC-menu CONFIGURATION-TRUNKS.

#### Link supervision

Digital trunks are supervised by the exchange and the state conditions, errors on the digital link to the public exchange are monitored. The monitoring data can be read out via RASC-menu maintenance-system-link supervisor and stored in a file or printed out.

#### Minimum system size

A minimum system comprises one cabinet equipped a CPU-D_ and either one ELU-D, ELU-C or ELU-A.

#### Power supply

Transformers, battery chargers, batteries and appurtenant cables are all included in the concept "Power supply".

#### Programmable parameters

The PBX possesses a considerable number of programmable parameters, which help O&M-personnel to adapt the function of the PBX to customer requirements. The majority of facilities and individuals can be programmed. See RASC-menu CONFIGURATION and the Cordless System Manager Software.

#### Recommended measure

Each warning code is described in RASC and recommended measures are offered.

See item Warning below.

#### Remote SW upgrading

The system software can be downloaded from a remote maintenance centre. Setting a certain time and date automatically loads the new software into the system non volatile memory and re-starts the exchange.

#### RP (Regional Processor)

The control system of the PBX is handled by a central processor and a number of regional processors. A typical task for an RP is to handle the hardware check on the individuals on a PBA.

#### Update board position

The database contains, among other things, relevant data for all board (PBA) positions in the PBX. The database contains also details about the type of PBA that should be installed.

The update means that the database is adapted to physical reality. An update is required in conjunction with a configuration change of the PBX, e.g. on expansion with new PBAs, on removal of PBAs and when a PBA is replaced by a different type of PBA.

See RASC-menu MAINTENANCE-HW/SW-RP.

#### Warm start

Restart of a PBX with no cold start strap installed. This is the normal procedure in conjunction with power-up or controlled restart via RASC-menu Maintenance-log-reset.

All programmed data is retained.

#### Warning

The control system of the PBX is structured so that warnings are generated when abnormal situations occur. The warnings can be read out by O&M-personnel and also personnel who have access to the control system's source code.

Warnings that are directed to O&M-personnel are complemented with a recommended measure.

Warnings without recommended measures shall be interpreted by persons with access to the control system's source code.

Revision: F © Ericsson Enterprise 2003