BusinessPhone Communication Platform 4.0
System Description ASB 150 02

## Operational Mode

As a general principle and to the greatest extent possible the PBX shall make itself operational. This means that default data is stored in the PBX's database on the basis of the configuration, facilities and device boards, the PBX is equipped with.

The intention is that it shall be possible to test the PBX without having to assign values to numerous parameters first.

Before a PBX can be verified with the public network, however, certain market-dependent parameters must be assigned values that apply for the local conditions on site (e.g. the signalling scheme for the public exchange).

### Start of the system

#### Cold start

"Cold start" means that the database of a PBX shall be initiated with default data. All (if any) previously stored data is erased and replaced with data based on the current configuration of the PBX.

For a cold start to be executed it is necessary to insert a special installation strap on the front of the CPU-D_ board. Thereafter the PBX shall be restarted.

The PBX's central processor will then erase all data memory. Thereafter the non-volatile E2 memory, battery backed-up RAM and realtime clock will be loaded with the data that applies for a standard version of the PBX.

CP will also request information from all device boards in all connected cabinets concerning the types of device that exist on the boards, the individual numbers of the various devices and the number of the board position.

Thereafter, CP will allocate data memory for all individual devices, give all devices a directory number and those default categories etc. that apply for the PBX. (Extensions 200, 201,... etc., trunk connections 700, 701,... as well as gathering all trunks in one route with number 0).

For other cases see Warm start below.

When the PBX has started, it is necessary to remove the installation strap.

#### Warm start

"Warm start" embraces all restarts of the PBX, if all programmed parameters stored in the non-volatile memory shall be retained. The installation strap on CPU-D_ must not be inserted.

There are two types of warm start:

- Application of voltage (Power up, reset)
- Other restart (Reset)

The only difference between the two types is that "other restart" is dealt with slightly differently by the system's fault administration function. Other restart is due probably to a program fault in the system. When the power supply has been connected, data from a certain type of log may have been saved in the system's data memory. This data can be read out from RASC.

During restart the central processor will compare the PBX's configuration (installed device boards) with the data that previously was stored in the semipermanent database. If device boards have been added, are lacking or are wrongly placed (inserted), a warning will be issued to this effect.

The device boards will then be initialised, the central processor will send data to all device boards, e.g. transmission parameters and information to the character windows of the system telephones.

Throughout the entire start-up sequence, the yellow LEDs of the boards will indicate different phases in the sequence. When everything is ready for traffic, all yellow LEDs will be extinguished (for more information see section Examples).

If the central processor discovers that a device board is lacking after restart, the system will be restarted automatically once more (after approximately 1 minute) in order to give the board another chance to report.

Incorrectly positioned or new boards will be blocked (yellow LED on the board lit) until a special command is entered which confirms that the new board position is valid.

### Replacement of software

All programs in the entire PBX are stored in EPROM. When a new program is to be installed in a PBX that is already operational, it is nsecessary to shut down the PBX so that the programs can be replaced on the affected boards.

The new program will adapt semipermanent data in the central database, so that the PBX will function after the program replacement without recourse to a cold start procedure. It may be necessary to alter certain programmable data manually after a program replacement.

If the PBX is upgraded with a new central program edition, new functions will be added. These new functions usually possess a number of parameters that are programmed via RASC. For this to function also RASC must be upgraded in the corresponding manner.

Revision: K © Ericsson Enterprise 2003