Distributed Architecture
The architecture for Florida includes two Operations and Maintenance Center (OMC) configurations. The OMCs provide central management and monitoring of the network and maintain the system-wide directory of sites and resources. The OMCs hold the central user directory and authenticate all user logons. There are two fully functional OMC sites for redundancy; they are located in separate regions of the state. The OMCs also provide centralized fault monitoring and network performance reporting. These two control sites are configured as primary and secondary units. The two sites constantly synchronize their databases. This allows the secondary site to takeover network management if the primary site fails; such a takeover occurs in less than 120 seconds.
Each control site includes two sets of server platforms. One platform manages the OMC functions while the other platform manages the main Session Initiation Protocol (SIP) proxy server application. If both OMC sites should become unavailable, all current patches/calls are maintained and new calls can still be set up as they are managed by the regional SIP servers.
There are seven SIP servers throughout the state that set up the patches/calls. If a regional SIP server is not available, requests for calls are routed to the primary OMC SIP server or secondary OMC SIP if the primary site is not available. If a SIP server becomes unavailable after a call is set up, the patch remains in effect.
The OMCs are managed through the Administrator Control Panel (ACP) application. There are nine ACPs in the system. One is at the primary OMC, one is at the CITS, and the remaining seven are located in each RDSTF region. Any ACP can reach the OMC servers for administrative functions.
The typical dispatch center has a Radio Gateway Unit (RGU), Workstation Gateway Unit (WSGU), Dispatcher Application and local radio system interfaces. The RGU is a voice and data switch with eight ports for connecting local radio system resources to the network.
The WSGU connects the Dispatcher Application computer to the network and supplies the audio services. The radio interfaces can be done in several ways depending on the local environment. The WSGU also connects the local dispatch center to other centers for intercom and conferencing communications.
Software releases, including new audio encryption keys, are distributed over the network.