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Attachment A - Joint Agreement for 800 MHz CCCS Page 35 of 83 Planned maintenance work is being performed on the System that will impact performance or System operations Equipment malfunctions or failures that affect System performance or operation Configuration changes in equipment or software by any user agency that may impact operations of any other agency 4.3 Network Management Purpose or Objective Defines the responsibilities for network management. Technical Background The System is comprised of, but not limited to, channel banks, hubs, switches, routers, servers, local area networks, and wide area network links connecting sites together. The network sites are interconnected by usage of microwave radio equipment, fiber, Ethernet or telecom T1 circuits. The radio network is monitored with network management tools provided by the equipment manufacturers and/or other vendors. The radio System architecture is primarily constructed around the APCO Project 25 standard. The microwave system is composed of Industry standard equipment, which also provides flexibility and a large variety of management and diagnostic tools. The System network is complex. Unusual problems may be difficult to identify and resolve. System documentation shall be kept up to date or it will lose its value in supporting the System network. The System is protected from all other agency data networks to manage the security and functionality of the System. If there is a connection to another data network, it shall be through a manufacturer specified and configured firewall, and approved by the Lead Agency. Operational Context The components of the System are considered as "owned" by the Partnership with responsibility for maintenance of the sites and equipment delegated to the Lead Agency by the authority of the 800 MHz CCCS Governance Committee and the 800 MHz CCCS Joint Agreement. Any required maintenance contractor agreements will be negotiated by the Lead Agency and presented to the 800 MHz CCCS Governance Committee for approval. The backbone of the System is structured on an integrated network. Any infrastructure hardware and software upgrades or changes that may impact the System require reasonable discussion, approval and oversight by the Lead Agency, and the 800 MHz CCCS Governance Committee. All maintenance work being scheduled that may affect System performance is preceded by reasonable and appropriate notification to the user agencies.