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SAT system enables the execution of quick, direct dispatcher’s and telephone emergency – loud speaking communication with the utilization of subscribers’ telephone exchanges of any type. It is adjusted to work in difficult industrial conditions, such as mining, petrochemical, chemical plants, and similar. It can be used in places with high acoustic levels, extensive humidity, salinity and dustiness, as well as in locations endangered by explosions of methane and other gases, fuel vapors, etc. (explosive groups I and IIB according to the standard PL_EN 50014).
The basic advantage of this system, if compared to previous solutions (TEDAR, STAR), is the application of disperse control systems what enables the full module flexibility. This feature allows the construction of individual systems with the capacities from a few ones to 192NN, with the option to be developed through netting of several systems.

Additionally, the system module structure has increased few times the system reliability, because any possible system failure within the scope of one module with OSA controller would not destabilize the work of the others. One from among OSA controllers at SAT rack is declared as the master controller.

SAT system may also cooperate with other devices – such as, for instance, methane-detecting, fire, telephone exchanges, visualization systems and other. These devices are linked to the outside RS485 main conduct through BUZ buffers of outside equipment or via Ethernet.

SAT system is equipped with four acoustic rails what enables the simultaneous work of four dispatchers. Additional computers, without conversation option, may be hooked up with the status of a watch post.


SATA – (emergency) version equipped only with programmable intrinsically safe signalling device – telephones type PST

SAT/N– (emergency, non-intrinsically safe) version equipped only with programmable signalling device – telephones type PST-N

SATT – (telephone) version equipped only with intrinsically safe telephones type TIG-S

SAT/N– (telephone, non-intrinsically safe) version equipped only with industrial telephones type TPN-S

SATZ – (integrated) version equipped with both intrinsically safe signalling devices – telephones PST and intrinsically safe telephones TIG-S

SAT/N– (integrated, non-intrinsically safe) version equipped with both signalling devices – telephones PST-N and telephones TPN-S


With all types of telephone exchanges.

Power supply

Buffered – 48 or 60V DC.


  • any, in modules of 16 NN
  • standard – n x 192 NN

Surface equipment

  • SSI-SAT line – separating rack
  • computer dispatcher’s posts with conversations recorders
  • PD-SAT dispatchers’ control desks – up to 3 pieces
  • SU-SAT maintenance post – 1 piece

Underground equipment

  • PST programmable loudspeaking telephones
  • TIG intrinsically safe telephones
  • MCCD-01 underground controllers (option)

SAT technical data

SSI-SAT racks feeding 48 V DC buffered
Power drawn form the supply source 48 V 3 W x No. Of subscribers
Power supply of dispatchers’ desks 230 V AC guaranteed
Internal power supply +5, +12, -48 V
Maximum number of dispatcher’s communication lines 1040
Levels of conversation signals 0.775 V (0dBm)
Maximum voltage in non-spark safe subscriber’s line 41 V DC
Maximum voltage in intrinsic subscriber’s line 41 V DC
Current efficiency of exchange subscriber’s equipment 30 mA
Current efficiency of output circuit of LPI unit 35 mA
Current efficiency of output circuit of LPI unit ExiaI/IIB acc. to PN-EN50014
Protection degree of PST casing IP65
Protection degree of MCCD-01 casing IP54
Operating temperatures range from +5 °C to +40 °C

Electrical parameters of line units LPI and LM

Current from -48 V input max. 50 mA
Current from +12 V input max. 50 mA
Telephone line input resistance max. 600 Ω
Telephone line impedance for 1000 Hz 600±50 Ω
Direct voltage at unloaded line output max. 41 V
Maximum value of direct current in line 45 mA
Level of DTMF signal at line output 4±1 dB

OSA technical data

Power supply voltage +5 V
Power consumption max. 100 mA
RS485 main conduct protocol MODBUS

Parameters of KTD – computer dispatcher’s communication card

Power supply voltages +5 V i +12 V
Current from +5 V/12 V input max. 100 mA/100 mA
Number of control circuits 1
Number of telephone line inputs 2