Signal box is configured into 4 technological levels:
- level of the control computers,
- level of technological computers working in mode 2 out of 2,
- level of relay circuits,
- level of outer equipment,
All computer levels are 100% backed-up and run in so called hot stand-by. The first two levels create the electronic part, the third and fourth one represent the performance part. Signal box can cooperate by means of relay interface with outer elements commonly used in interlocking technology, such as: signals, point machines, track circuits, axle counters, auxiliary commanding posts. Signal box is installed into signal box switching centre except of control computer which is situated in operator office. The inner part of the signal box is installed in locked containers.