Johnson Controls NCM comm INFO

N1 Ethernet IP Network Network Technical Manual 636 Communications Section Bulletin Date 0401 to Ethernet to the Metasys N1 LAN N1 Ethernet IP Theory of Operation Definition of Terms Additional Sources for Information the Network General System Performance Requirements Media Components Configuration Manageability and Maintainability Limitations Specifications and Estimating an Installation Protocol Standards and Compatibility Environment and Power System Expansion Cabling Guidelines those sections where changes have occurred since the last printing 2001 Johnson Controls Inc No LIT 6360175 Hubs and Repeaters the Ethernet Adapter Card Up the N1 Ethernet IP Network General Before You Start Testing Cable Laying Cable Wiring Details Verifying the N1 LAN Installation the Connectors Up the Metasys Network on Ethernet Obtaining the IP Subnet Mask and UDP Port Addresses Hardware Requirements Configuring Ethernet Adapter Cards for the NCMs Configuring the OWS Moving ARCNET Nodes to an Ethernet Connection or Changing Gate Node of Existing Metasys Nodes the Hardware at the NCM Changing a Single Metasys Node IP Address Changing the IP Address of Multiple Metasys Nodes Configuring the NCMs Configuring Multiple N1 Networks Example 1 Reconfiguring a Single Ethernet N1 as or More Individual Networks Example 2 Configuring Separate Networks as Multinetworks those sections where changes have occurred since the last printing Network Communications Ethernet IP Network Procedures Using Windows Tools Debugging OWS and NCM Failures Troubleshooting a Single NCM Failure Troubleshooting a Multiple NCM Failure Troubleshooting an OWS Troubleshooting General Metasys Network Failures Troubleshooting Other Network Problems A Glossary B Ordering Information Johnson Controls Code Numbers Supplier Part Numbers those sections where changes have occurred since the last printing Communications Ethernet IP Network 3 Network Communications Ethernet IP Network to Metasys LAN Metasys N1 Local Area Network LAN can use Ethernet or technology in the circuit boards and software of Operator OWSs and the Network Control Module NCM 350s devices communicate over the N1 Ethernet IP cable via an Ethernet Card which is also known as a Network Interface Card NIC For ARCNET installations refer to the N1 ARCNET Local Area Technical Bulletin LIT 636017 Metasys N1 LAN hereafter referred to as N1 carries all types of including shared point and control information database and downloads commands to field equipment summaries and messages The N1 supports the distributed nature of the Network in which each node has a specific function to perform relies on others only for shared data For example one node might be in the basement and serve a chiller while another node may be in the penthouse and serve the cooling towers In addition the could share data such as the same outside air temperature N1 Ethernet IP as opposed to ARCNET uses the industry standard Datagram Protocol UDP service provided by Transmission Control Protocol TCP IP and works with single and multiple LANs to Ethernet is the most widely used LAN technology approximately percent of all LAN connections installed use Ethernet It strikes a good between speed price ease of installation and supportability Ethernet standard is defined by the Institute of Electrical and Engineers IEEE in a specification known as IEEE 802.3 802.3 specification covers rules for Ethernet LAN configurations and how the elements of the network should interact The Ethernet provides the services called for in the Physical and Data Link of the Open Systems Interconnection OSI reference model to the 802.3 specification Ethernet networks transmit data at a of 10 million bits per second Mbps This means that when a station a packet onto the Ethernet medium it transfers data to the node at a rate of 10 Mbps This equals approximately pages of text per second Communications Ethernet IP Network 5 Ethernet IP of cabling and device connections cost per connection interoperability major benefits of an Ethernet network are performance equipment and topology compatibility easy installation and expandability transmits data efficiently and flexibly Ethernet segments may be to a variety of other communications types such as high speed running up to 155 megabits per second Backbone options the 100 Mbps Fast Ethernet Fiber Distributed Data Interface Token Ring and the Asynchronous Transfer Mode ATM maintenance costs Metasys nodes can only connect directly to 10 Mbps Ethernet use higher speed backbones other network equipment must be Ethernet network standard is used reliably in commercial and settings around the world every day Peer to peer and automatic network configuration enhance the of Ethernet Peer to peer communication ensures that the is not dependent on any single device to control the transmission data between devices to Ethernet popularity you can link systems built by many different to the same Ethernet LAN Its extensive installation base vendor support and use of standard Personal Computer PC and software make Ethernet easy and economical to expand wide implementation contributes to its interoperability and a common basis for supporting heterogeneous networks access method used by devices connected to an Ethernet LAN is key element defined in the IEEE 802.3 specification The Ethernet method is called Carrier Sense Multiple Access with Collision CSMA CD Carrier Sense Multiple Access CSMA provides a for all hosts on a baseband network to be able to access the network Collision Detect CD is a method each host uses to determine another host is attempting to use the network When a node is ready transmit its sense listens to see if other devices are already because with CSMA CD each station contends for access to shared medium In other words any node can attempt to communicate any time Network Communications Ethernet IP Network of section includes a few key terms that appear throughout this Appendix A Glossary of this document contains a complete of Ethernet and important networking and connectivity terms collision on the Ethernet LAN results when two nodes try sending at exactly the same time Collisions are considered normal events Ethernet networks are designed to quickly resume normal activity after collision occurs If the network hardware detects a collision both devices at random intervals and attempt to resend The process repeats until packet transmits successfully or is automatically aborted after sixteen collisions A message transmits at optimum speed if there are collisions with other nodes 1 is a comparison of ARCNET and Ethernet methods of operation 1 ARCNET and Ethernet Comparison LAN Feature Access Type Twisted Pair Fiber Mbps Passing Star Mixed Segment LAN Twisted Pair Fiber Mbps Star Mixed Segment LAN node is any addressable device connected to the LAN using an Adapter Card Node A Metasys node is a specific type of node NCM or which is connected to the N1 Pro