This system is a hybrid system, i.e. it can operate in PABX mode or key system mode. It has a non-blocking digital switching network.Four different models are proposed for varying system capacities :
- model S
- model M
- model L
- model SLEach model consists of a wall box which contains :
- trunk line circuits
- extension line circuits (proprietary or analog stations)
- data communication line circuitsThis unit is designed to operate in an office environment.
The system consists of printed circuit boards plugged into a backplane which provides the connections between various boards. The backplane contains specifically-assigned slots and general-purpose slots.The assigned slots are designed to accomodate :
- the central processing unit card, which comprises :
- the microprocessor
- the memories
- the digital switching matrix
- the DMTF receivers
- the DMTF frequency, tone and ringing signal generators
- the time base, the date and time module
Optionally, it can accommodate two daughter cards :
- a 32s digital music on-hold card,
- a card carrying the backup memory functions and two V24 outputs (RS-232-C)
- the analog option card, which comprises
- the additional conference circuits
- the trunk call music on hold circuits
- the trunk call background music circuits
- additional DMTF receivers,
and you can accommodate 2 daughter cards :
- general paging (GP)
- DISA
- the mains power supply unit
SYSTEM LIMITS FOR 4200 K & H
| 4200 H | 4200 K | |
| - Maximum number of trunk lines | 20 | 28 |
| - Maximum number of stations | 32 | 120 |
| - Maximum number of proprietary stations | 32 | 48 |