SCADA systems are used in many strategic industry networks, such as utility and transportation, to monitor and maintain the networks from remote monitoring locations. SCADA systems use a master/slave architecture with a single master that supports multiple slave remote terminal units (RTUs).
Nokia addresses the needs of SCADA customers with the Integrated Services card. The Integrated Services card is a resource card that is capable of supporting software applications that specifically meet the requirements of TDM-based SCADA systems. The card is supported on the 7705 SAR-8 Shelf V2 and the 7705 SAR-18.
The Integrated Services card supports the following SCADA applications:
multidrop data bridge (MDDB)
pulse code modulation (PCM) multidrop bridge
voice conference bridge (VCB)
Only one application can be active on the card at a time.
The MDDB and PCM multidrop bridge applications feature similar architecture and functionality, with the main exception being that the MDDB application uses a serial RS-232, RS-530, or X.21 interface, while the PCM multidrop bridge application uses an E&M analog interface. The VCB application builds on the PCM architecture, using A-Law or Mu-Law encoding and an E&M analog interface.