Supervisory control and data acquisition (SCADA) applications allow users to monitor and control various remote functions and processes. Traditional SCADA networks are designed using leased line point-to-point, or multipoint circuits which allow the master controller to poll each slave in a predefined order. Through this process, the master can oversee the slaves’ control, maintain the process, and react to changes at the remote sites.

SCADA systems work over a communications network exercising control of a wide range of remote terminal units (RTUs) and programmable logic circuits (PLCs) using proprietary and industry standard protocols, such as DNP3, ModBUS, Motorola’s MOSCAD, and Allen- Bradley’s DF1, as well as the newer systems which are IP based. SCADA systems can be relatively simple, such as one that monitors the environmental conditions of a small office building, or incredibly complex, such as a system that monitors all the activity in a nuclear power plant or the activity of a municipal water system.

IT Stairway provides converged network solutions to integrate voice, data, and video over a single network combining the latest technologies such as MPLS, Broadband VPN, and SIP Trunking to take advantage of the tremendous cost savings and value-added services offered today. The Vanguard advantage enables SCADA, serial data, and voice access into these heretofore IP-only networks as an element of the IP convergence solution.


Vanguard Networks’ suite of multiservice gateways provides a unique solution to the Utility industry; one that integrates existing half-duplex SCADA processes with newer IP-enabled processes, and eliminates costly leased line circuits with a more flexible and functional packet-based network (Frame Relay/MPLS/VPN). That in turn facilitates the integration of other traffic types, like voice – and Vanguard gateways offer a full complement of analog and digital voice features, as well as voice over IP (VoIP). Thus, utility companies can further reduce their monthly recurring telecommunications charges by eliminating the voice line at remote, unmanned substations.

Benefits of SCADA systems and IP networks integration:

Supports IP, SNA, SCADA and proprietary protocols
Connectivity to Ethernet or Serial interfaces
Leverage newer more cost-effective IP-based technology and carrier services
Reduce monthly recurring telecommunications costs
Support multiple devices per site
Allows integrated voice communications service to remote sites over the same network