Presentation is loading. Please wait.

Presentation is loading. Please wait.

Network Topologies 3-19. 3-20 Free Topology Ring, star or combination layout of network media All except ring are polarity insensitive One terminator.

Similar presentations


Presentation on theme: "Network Topologies 3-19. 3-20 Free Topology Ring, star or combination layout of network media All except ring are polarity insensitive One terminator."— Presentation transcript:

1 Network Topologies 3-19

2 3-20 Free Topology Ring, star or combination layout of network media All except ring are polarity insensitive One terminator installed anywhere on the segment Typical for device channels May be difficult to troubleshoot bad devices Installers could possibly exceed wiring limits Simple to expand and add new devices T T

3 3-21 Bus Topology Daisy chain structure with beginning and end Must be terminated at beginning and end of segment TP/FT-10 Free Topology terminators are different from TP/FT-10 Bus Topology terminators TP/XF-1250 channels use different terminators than TP/FT-10 channels Compared to Free Topology: Easier to troubleshoot Longer cable runs allowed More difficult to expand and add new devices T T

4 3-22 Backbone Topology Connects routers to a common backbone channel Typically installed in a bus topology and includes routers, tool network interfaces, and system wide controllers Can be high speed twisted pair TP/XF-1250 or IP-852 channel Reserves bandwidth for network tools and system control devices such as web servers, data loggers, schedulers, alarm generators, etc. Termination will depend upon typology used on specific segments

5 Case Study Exercise: Identify Network Architectures Turn to the Laboratory Exercises chapter of your workbook – this is Laboratory 1 Form a team with one or two fellow students Read exercise instructions Write down your answers Class review follows in 20 minutes 13-23

6 Installation Scenarios 3-24

7 3-25 Engineered Design – Planned Installation Scenario Design tool is not attached to the network devices during design process Tools obtain device information from the device external interface file (xif) Allows network design to be completed in parallel with infrastructure installation Verifies device compatibility prior to purchasing Allows distribution of design workload

8 3-26 Ad Hoc Installation Design tool is attached to the network devices while the design is created Tools can upload the device interface information from the device Use this method if XIF file is not available Typical for small networks Design should be created while the tool is OffNet to minimize traffic consequences from updating device information

9 3-27 Matching the Design with the Physical Network The logical device on the design must match the physical device installed on the network. The network tool first identifies the network device using the devices unique Neuron ID Service Pin depression Manual entry Device discovery The match is completed using the devices channel and program ID

10 Job Aids Guide for Determining Installation Scenario Network Tool Selection Guide 3-28

11 3-29 Selecting a Network Tool Should be based on the user and projects needs Available from many manufacturers Tools should include the latest L ON M ARK resource files documenting SNVT, SCPT and SFP Tools should perform multiple functions Network design and engineering Network commissioning and configuration Network monitoring and control Network maintenance and documentation Must be able to support up to 32,385 devices and domain addresses of up to six bytes (2 48 ) While not required for an open system, tools based on LNS provide Interoperability and connectivity features Capability to integrate L ON M ARK devices

12 3-30 Summary and Review 1.Do remote clients include the LNS network database? No 2.What has a data server allowing it to communicate directly with devices through its own network interface? Fullweight client 3.What is required by LNS tools to perform network management tasks The LNS database 4.Which topology is easier to troubleshoot and allows for longer cable runs? Bus 5.Which channel type can take advantage of existing IP infrastructure? IP How many devices must a network tool be able to support? What size domain address? 32,385, 2 48 (six bytes)

13 Selecting Infrastructure Components

14 4-2 Objectives Define the infrastructure components of a L ON W ORKS network Select network media Define the metrics and channel characteristics of channels Select appropriate network interfaces Select L ON W ORKS routers and repeaters Describe the difference between a router and a repeater IMPLEMENT THE NETWORK Identify Architectures Select Network Components Install Physical Network Program Network Commission Network Test and Verify Network Optimize Network Document Network Maintain Network DOCUMENT AND MAINTAIN PLAN THE NETWORK TEST AND OPTIMIZE

15 Main Infrastructure Components L ON W ORKS Devices 1 Communication Channels Communications media that connect L ON W ORKS devices Path between devices that exhibits various physical characteristics. Routers 1 and Repeaters Used to build large networks by connecting channels and segments Routers also used to transfer data from one channel type to another Network Interfaces 1 Connect PC to L ON W ORKS network Also referred to as LonTalk adapter or LonTalk interface 1 Most commonly specified components RTR RPTR RTR NI 4-3

16 4-4 Physical vs. Logical (1) Neuron ID Unique 48 bit ID embedded into Neuron Chip Segment Section of physical media connected to router or repeater port Unpowered TP/FT-10 can support up to 64 devices Channel Representation of physical media segment(s). Connected to other channels via routers Characterized by device transceiver types Can consist of two segments linked via physical layer repeater Backbone Channel Domain 09E Segment D RTR 156 Subnet 5 Channel Y Segment E Channel Z Subnet 4 RTR Segment B Segment C RPTR 1243 Subnet 1 Channel X RTR Segment A Channel W Subnet RTR Subnet 3

17 4-5 Physical vs. Logical (2) Logical addresses are assigned during commissioning to enable devices to become active participants on network Node ID A logical address assigned to device Domain A logical collection of up to 32,385 devices (nodes) on one or more channels Can include up to 255 subnets Direct communications can only take place among devices configured in the same domain ID can be 1, 3 or 6 bytes (2 48 ) long Subnet A logical organization of up to 127 devices Some channels may include more than one Cannot span configured or learning routers Backbone Channel Domain 09E Segment D RTR 156 Subnet 5 Channel Y Segment E Channel Z Subnet 4 RTR Segment B Segment C RPTR 1243 Subnet 1 Channel X RTR Segment A Channel W Subnet RTR Logical Address Assigned by NI Tool Domain, Subnet, Node Example 09E, 2, 63 Subnet 3

18 Possible L ON W ORKS Media Types Twisted Pair Cable LONMARK Guidelines supports both TP/RS and TP/FT-10 TP/FT-10: low material cost, reduced cabling, high stability Twisted Pair Cable with Link Power Power and Communication on single pair of wires Power Line Reliable communications over existing power wires No additional cable or installation interruption, limited range, 5400 bps IP (Internet or Intranet) High transfer rate Can use existing IP infrastructure 4-6 Fiber Optic Highest transfer rate in rough (noisy) environments over long distances Radio Frequency Communicate with remote locations without cabling Infrared Electric Fencing

19 4-7 Channel Metrics Topology support: free, bus or other Maximum length Maximum device count Maximum number of packets/sec Cable type: standard or special Termination requirements Private or shared media max length pkt/s 1 2 stub length n min node distance max node count max node-to-node distance

20 Typical Channel Capacities TP/FT-10 TP/XF-1250 PL-20x IP-10x PL-20N (3.6/5.4 kb/s) TP/FT-10 (78 kb/s) TP/XF-1250 and FO-20 (1.25 Mb/s) IP-852 (10/100 Mb/s) 100% No Collisions ~14 pps~227 pps~850 pps 84% Maximum Throughput ~12 pps~192 pps~720 pps 15,000 pps or greater 67% Sustained Throughput ~9 pps~153 pps~576 pps 50% Design Guideline ~7 pps~115 pps~425 pps pps: packets per second (average packet = 15 bytes) IP-852 estimate based on 46 byte minimum payload

21 Job Aids Common L ON W ORKS Channel Types Miscellaneous Channel Types L ON M ARK Standard Channel Types 4-8

22 Connects channels or subnets to build large networks or reduce traffic Can connect different channel media types Filters or forwards messages based on Subnet ID or Domain ID (bridge) to provide network segmentation Can be configured as repeater to extend channel length Can be setup as learning, configured or bridge L ON W ORKS Routers Channel 2 FT-10 Channel 1 IP-852 Router 4-9 Bridge used to isolate packets within networks that include multiple network domains Learning router automatically builds its own filter table by monitoring traffic

23 Router and Physical Layer Repeater Differences While both provide signal refresh, L ON W ORKS Routers… Segment or isolate local traffic (primary function) Connect similar or different channel types Forward packets based on internal routing tables of subnet and group addresses maintained by LNS Can be configured as an intelligent repeater Physical Layer Repeaters… Extend channel distance by amplifying signal Allows for higher device counts Have no filter function and dispatch each message as received Pass all traffic – even noise Can lead to channel overload L ON M ARK Guideline The total network length and number of devices may be extended by use of ANSI/EIA/CEA routers, and/or one TP/FT-10 physical layer repeater. 4-10

24 IP-852 LPR-12 i.LON Router i.LON Router FT-10 XF-1250 Routing Design Guideline Improved Design – Route from slow to fast IP-852 LPR-12 i.LON Router i.LON Router Poor Design – Slower channel between faster channels FT-10 XF-1250 For best performance always route from slower to higher speed channels

25 Poor Design – LPR-15 throughput less than single XF channel Multiple XF-1250 Channel Routing IP-852 LPR-15 i.LON Router i.LON Router XF-1250 Potential Bottleneck Potential Bottleneck XF-1250 i.LON Router i.LON Router i.LON Router i.LON Router XF-1250 Improved Design – i.LON routes at full speed of XF-1250 channel IP-852

26 Large System Routing Poor Design – Too many router hops across slower channels FT-10 IP-852 FT-10 Improved Design – Eliminates hops across slower channels IP-852 LPR-10 (or individual LPR-12s) FT-10 MPR-50 FT-10 XF-1250 i.LON Router i.LON Router i.LON Router i.LON Router FT-10

27 Network Interfaces Connect PC to LonTalk medium Also referred to as network adapters and LonTalk interfaces Available in almost any PC form-factor, transceiver type and bus configuration Must support NSI (Network Services Interface) firmware for LNS applications Should support downloadable firmware images to allow for easy LNS firmware updates IP – virtual network interface (VNI) or remote network interface (RNI) VNI creates a high performance IP-852 network interface with greater throughput than NSI. RNI provides a remote IP network interface Which NSI ? Network Tool 4-14

28 Connectivity Options PCC-10: FT-10, TP-78, TP-1250 STLA-10: FT-10, TP-78, TP-1250, RS-485 FT-10, XF-1250 i.LON 100 FT-10, PL-20 (Modem Option) U20: PL-20 U10: TPFT-10 i.LON 100 i.LON 10 (Router Option) i.LON 600 i.LON SmartServer i.LON SmartServer FT-10, PL-20 PCLTA-20: TP-1250 SMX PCLTA-21: FT-10, TP-78, TP-1250, RS-485 FT-10, PL-20 i.LON 100 i.LON 600 i.LON SmartServer Modem PCI PCMCIA EIA-232 IP-852 Routing 10/100 Ethernet IP/RNI USB Modbus IP 4-15

29 4-16 Summary and Review 1.What are the most commonly specified components in a L ON W ORKS network? LonWorks devices, router and network interface 2.How many devices can a subnet support? How many can an unpowered TP/\FT-10 segment support? 127, 64 3.Which channel type can provide the highest transfer rate in noisy environments over long distances? Fiber optic 4.What can segment or isolate local traffic and connect similar or different channel types? Routers 5.True or false: L ON M ARK Guidelines supports RS485 for use on twisted pair. True. RS-485 is supported as TP/RS485-39

30 Installing the Physical Network

31 5-2 Objectives Define infrastructure installation tasks Select and install channel media Decide where and when to use terminators for twisted pair channels Identify common installation pitfalls Describe guidelines for installing channel topologies : Properly install shielded cable Describe device installation guidelines

32 5-3 IMPLEMENT THE NETWORK Identify Architectures Select Network Components Install Physical Network Program Network Commission Network Test and Verify Network Optimize Network Document Network Maintain Network DOCUMENT AND MAINTAIN PLAN THE NETWORK TEST AND OPTIMIZE Installation Tasks Install backbone channel Install device channels and routers Install terminators where needed Mount and install devices Provide power supplies to devices Connect I/O wiring to devices Most L ON W ORKS network problems can be traced back to an inadequate installation of cables and devices.

33 5-4 Cabling Installation Use Echelon tested cable types Match cable length limitations to transceiver type and channel topology For link power transceiver devices (LPT-11), size wire to accommodate 42 VDC voltage drops over distance Size distributed power cable to accommodate voltage drops over distance Avoid magnetic inductive interference when laying cables Keep nominal distance from AC cables Separate from RF and high voltage sources (low voltage sources okay) Maintain twisting to terminal Keep away from devices and actuators that generate strong interference Use lightning-current arrestor needed anytime twisted pair goes outside building Follow local and national regulatory requirements

34 Tested Twisted Pair Cable Type Limitations 5-5 Bus TopologyFree Topology Max Stub Max Bus Length Max Node-to- Node Max Total Cable ISO/IEC meters600 meters250 meters450 metersSpecified TIA 568A Category 5 TP/FT-10 3 meters TP/XF meters TP/FT meters TP/XF meters TP/FT meters TP/FT meters Validated Beldon 8471 TP/FT-10 3 meters TP/FT meters TP/FT meters TP/FT meters Beldon TP/FT-10 3 meters TP/FT meters TP/FT meters TP/FT meters Level 4/ Level IV TP/FT-10 3 meters TP/XF meters TP/FT meters TP/XF meters TP/FT meters TP/FT meters JY (st) TP/FT-10 3 meters TP/FT meters TP/FT meters TP/FT meters

35 Grounding Shielded Twisted Pair Cable When using shielded cable, terminate shield using the recommended grounding circuit Ground the cable shield at least once per segment and preferably at each device Grounding the shield at every device will assist in suppressing 50/60Hz standing waves. Communication wires are not grounded Shielded cable not recommended unless in high EMI environment. 5-6

36 Job Aids Cabling Installation – Procedures Cabling Installation – Common Pitfalls Miscellaneous Infrastructure Components 5-7

37 5-8 Termination: What is it? A termination is a load connected across the network pair Termination absorbs unwanted signal reflections (resonance of date signal) which would interfere with communications causing packet errors Free topology uses one terminator anywhere on segment Bus topology uses two terminators one at each end of segment Verify termination for unknown twisted pair media by checking wiring impedance using an AC bridge 100 F 52.3 Free Topology 105 Bus Topology TP/FT-10 TP/LP-10 TP/LP-11 Channels 0.15 F F TP/XF-78 TP/XF-1250 Channels F Power Line Channels

38 5-9 Device Installation Mount devices as close to I/O as possible Where possible, avoid high EMI sources Install application specific devices on application specific channels Isolate device to device traffic where possible Use routers for each subsystem Install fewer than maximum allowed to provide for future expansion Locate system-wide control devices and network tools on or close to the backbone Web server devices, trend loggers, schedulers, etc…

39 LPT Link Power - Power and Communication on TP/FT-10 LPT Link Power devices draw power from central 42V power supply on TP/FT-10 channel eliminating need for individual device supplies Link power transceiver separates 78 kbps communication and 42 VDC power to supply +5VDC at up to 100mA to Neuron and I/O applications Both link power and locally powered TP/FT-10 devices can be supported on a given segment, provided that the following constraint is met: (1 x LPT) + (2 x TP/FT) 128 TP/FT-10 devices must be designed to ISO/IEC (ANSI/CEA ) which specifies appropriate blocking capacitors Considerations The sum of the application current of all the devices in a segment must not exceed 3.2A on 5V supply. Voltage at LPT supply typically 41.0 to 42.4V Voltage at end of cable must not be less than 26V - LPT transceiver lower limit Actual number of devices on segment depends upon cable length and current Example: 500 meter Beldon 8471 and support 128 evenly distributed LPT devices at 25mA, 64 at 50mA or 32 at 100mA 5-10

40 Job Aids Junction Box and Wiring Guideline for Twisted Pair L ON W ORKS Networks FTT-10A Free Topology Transceiver User's Guide LPT-10 and LPT-11 Link Power Transceiver Users Guides These job aids are on your student CD. Most recent versions on the Echelon Web site.

41 5-12 Summary and Review 1.What can most L ON W ORKS network problems be traced back to? Inadequate installation of cables and devices 2.How can you avoid magnetic inductive interference when laying cables? Keep nominal distance from AC cables. Separate from RF and high voltage sources. 3.What must be used anytime twisted pair cable goes outside of a building? Lightning-current arrestor 4.How many terminators are required on a twisted pair free topology segment? Bus topology? Where should they be installed? Free: One, anywhere on segment. Bus: Two, one at each end of segment. 5.How many non-link powered devices can be added to a segment which already has 56 link-powered devices? 36 (128 – 56) / 2 6.Where and how should shielded cable be grounded? At minimum once per segment, preferably at each device

42 Exercise: Selecting and Installing Infrastructure Components 5-13 Turn to the Lab 2 in the Laboratory Exercises chapter of your workbook Form a team with one or two fellow students Read exercise instructions Find answers Lab discussion and class review follows in 20 minutes

43 Review Describe the principles of L ON W ORKS networks Select network architectures and design strategies Determine installation and maintenance scenarios Select channel types, infrastructure devices, application devices Install the physical network infrastructure

44 Lab 1, Case Study 1 L1-1 Mode m SLTA- 10 PSTN NM Tool NSI HMI Tool NM Tool


Download ppt "Network Topologies 3-19. 3-20 Free Topology Ring, star or combination layout of network media All except ring are polarity insensitive One terminator."

Similar presentations


Ads by Google