1. 3-19
This topology discussion is important to understand when we get to installation. Make sure any students who are falling asleep are paying attention here if they will be involved in installing
Network Topologies

2. Free Topology LM Exam Ring, star and mixed examples of free topology
3-20
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
LM Exam
Ring, star and mixed examples of free topology
All except ring are polarity insensitive T

3. Bus Topology LM Exam Longer cable runs and easier to troubleshoot
3-21
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
LM Exam
Longer cable runs and easier to troubleshoot T

4. Termination will depend upon typology used on specific segments
Backbone Topology
3-22
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
13-23
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

6. Installation Scenarios
3-24
Installation Scenarios

7. Engineered Design – Planned Installation Scenario
3-25
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. Ad Hoc Installation
3-26
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
Note that ad hoc installation requires more highly trained and experienced personnel to be on site during the installation phase, compared to a 2-phased engineered installation.

9. Matching the Design with the Physical Network
3-27
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 device’s unique Neuron ID
Service Pin depression
Manual entry
Device discovery
The match is completed using the device’s channel and program ID

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

11. Selecting a Network Tool
3-29
Should be based on the user and project’s needs
Available from many manufacturers
Tools should include the latest LONMARK 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 (248)
While not required for an open system, tools based on LNS provide
Interoperability and connectivity features
Capability to integrate LONMARK devices
LM Exam
Integration tool selection based on users requirements
Available from many manufacturers
Common network management tasks - binding, commissioning, and device configuration
Chosen based on user requirements
For full LonTalk support, must support 32,385 devices (domain)
Provide device with applications, logical addresses and links to device variables
A primary goal of all integration tools – assign logical addresses

12. Summary and Review No Fullweight client The LNS database Bus IP-852
3-30
Do remote clients include the LNS network database? No
What has a data server allowing it to communicate directly with devices through its own network interface?
Fullweight client
What is required by LNS tools to perform network management tasks
The LNS database
Which topology is easier to troubleshoot and allows for longer cable runs?
Bus
Which channel type can take advantage of existing IP infrastructure?
IP-852
How many devices must a network tool be able to support? What size domain address?
32,385, 248 (six bytes) No
Fullweight client
The LNS database
Bus
IP-852
32,385, 248 (6 bytes)

13. Selecting
Infrastructure
Components

14. Objectives Define the infrastructure components of a LONWORKS network
4-2
IMPLEMENT THE NETWORK
Identify
Architectures
Select Network
Components
Install Physical
Network
Program
Commission
Test and Verify
Optimize
Document
Maintain
DOCUMENT AND MAINTAIN
PLAN THE NETWORK
TEST AND OPTIMIZE
Define the infrastructure components of a LONWORKS network
Select network media
Define the metrics and channel characteristics of channels
Select appropriate network interfaces
Select LONWORKS routers and repeaters
Describe the difference between a router and a repeater
This section uses what we’ve discussed before with respect to architectures, maintenance and installation scenarios, and so forth. The goal is to find out what infrastructure devices we learned of already, and to summarize what they are used for.

15. Main Infrastructure Components
4-3
LONWORKS Devices1
Communication Channels
Communications media that connect LONWORKS devices
Path between devices that exhibits various physical characteristics.
Routers1 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 Interfaces1
Connect PC to LONWORKS network
Also referred to as LonTalk adapter or LonTalk interface
1Most commonly specified components
RTR
RPTR NI
LM Exam
Most commonly specified – LonWorks devices, router and network interface
Network interface connects PC to LonWorks network

16. Physical vs. Logical (1) LM Exam
Stress network integration tool assignment of logical addresses
Stress number devices, subnets etc.
4-4
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
LM Exam
Unpowered TP/FT-10 can support up to 64 devices
64 max FTT nodes per network segment
Backbone
Channel
Domain 09E
Segment A
Channel W
Subnet 2 1 2 3 4 61 62 63
RTR
Channel X
RTR
Segment B
RPTR
Segment C 1 2 62
124 1 2 3
Subnet 1
Subnet 3
Channel Y
Channel Z
RTR
Segment D
RTR
Segment E 1 2 3 1 2 55 56
Subnet 4
Subnet 5

17. Physical vs. Logical (2) LM Exam
Stress network integration tool assignment of logical addresses
Stress number devices, subnets etc.
4-5
Logical Address
Assigned by NI Tool
Domain, Subnet, Node
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 (248) long
Subnet
A logical organization of up to 127 devices
Some channels may include more than one
Cannot span configured or learning routers
Example
09E, 2, 63
LM Exam
Logical address needed to be active participant on network
Domain up to 248 (6 bytes)
Logical address assigned during commissioning - domain/subnet/node id
Domain highest level in logical LonWorks network structure
127 Max devices per subnet
255 Max subnets per domain
32385 Max devices per domain
Backbone
Channel
Domain 09E
Segment A
Channel W
Subnet 2 1 2 3 4 61 62 63
RTR
Channel X
RTR
Segment B
RPTR
Segment C 1 2 62
124 1 2 3
Subnet 1
Subnet 3
Channel Y
Channel Z
RTR
Segment D
RTR
Segment E 1 2 3 1 2 55 56
Subnet 4
Subnet 5

18. Possible LONWORKS Media Types
4-6
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
LM Exam
TP – low material cost, high stability
PL – Reliable communications over existing power wires
PL – no additional cable or installation interruption, limited range, 5400 bps
FO allows highest transfer rate in “rough” environments over long distances
FO advantage - longer distances than TP
FO used in “noisy” electrical environments
TP /FT has helped reduce cabling and improve stability
LM Guidelines supports both TP/RS and TP/FT-10
PL-20 (Band C) transmits at 132 kHz
RF – Communicate with remote bldg without cabling
“Fencing” is not a joke. A company in New Zealand made a power line-like transceiver to communicate on the wires of long running electrical fencing (cattle fencing). The communication is used to monitor and supervise the charger units and batteries along the fence.
Note that twisted pair is the most commonly used network media. When choosing a channel type, it is important to look at the devices available with the transceiver type required.
Fiber Optic
Highest transfer rate in rough (noisy) environments over long distances
Radio Frequency
Communicate with remote locations without cabling
Infrared
Electric Fencing

19. Channel Metrics Topology support: free, bus or other LM Exam
4-7
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
LM Exam
Max length depends on wire type
Max node-to-node is maximum distance from each node to each of the other nodes located in the same segment
Note that, although throughput is the most commonly quoted number, length constraints and maximum node counts are equally important.
max length
pkt/s 1 2
stub
length n
min node
distance
max node count
max node-to-node

20. Typical Channel Capacities
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
~9 pps
~153 pps
~576 pps
50%
Design
Guideline
~7 pps
~115 pps
~425 pps
TP/FT-10
TP/XF-1250
PL-20x
IP-10x
LM Exam
TP/XF-1250 transfer rate – 1.25 Mbits/s
PL-20C transmits on 132 kHz
Protocol analyzer measures 100 pps on TP?FT-10 – approx BW =50%
FO same transfer rate but lower sensitivity to noise than TP/XF 1250
PL-20N Channel
100% throughput no collisions: ~14 packets/sec
Maximum throughput (~84%): ~12 packets/sec
Sustained throughput (~67%): ~9 packets/sec
Channel design guideline (~50%): ~7
TP/FT-10 Channel
FTT-10A & FT 31x) Smart Transceivers
100% throughput no collisions: ~ 227 packets/sec
Maximum throughput (~84%): ~192 packets/sec
Sustained throughput: (~67%) ~153 packets/sec
Channel design guideline (~50%): ~115
TP/XF-1250 Channel
100% throughput no collisions: ~ 850 packets/sec
Maximum throughput (~84%): ~720 packets/sec
Sustained throughput: (~67%) ~576 packets/sec
Channel design guideline (~50%) : ~425
IP-852 Channels (IP-10L & IP-10W)
~15000 fps (10baseT with min. 46 byte payload)
~7000 LONTALK pps through PC Ethernet NI for monitoring purposes
pps: packets per second (average packet = 15 bytes)
IP-852 estimate based on 46 byte minimum payload

21. Job Aids Common LONWORKS Channel Types Miscellaneous Channel Types
4-8
Common LONWORKS Channel Types
Miscellaneous Channel Types
LONMARK Standard Channel Types

22. LONWORKS Routers LM Exam Router – connect two subnets
4-9
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
Channel 2 FT-10
Channel 1 IP-852
Router
LM Exam
Router – connect two subnets
Subnets help to reduce traffic
Bridge used to isolate packets within networks that include multiple network domains
Can be configured as learning, configured or bridge
Physical connection between two different media
How many subnets between two routers ? 1
Provide network segmentation
Learning router automatically builds its own filter table by monitoring traffic
Forwards message packets based on Subnet ID
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
LONMARK 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
LM Exam
Guideline
While both provide signal refresh,
LONWORKS 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
LM Exam
Repeaters provide signal amplification
Both provide signal refresh
Repeaters extend length of channel and allow for more devices
No filter function and dispatch each message as received
Max number repeaters without router - 1
Notes on physical layer repeaters:
- not the poor man’s router.
- only being in FTT/LPT networks,
- should only be used to exceed the maximum cable length or the maximum node count. Clarify that PLR have their places in that area, but they can not replace a real router.
- Collapsed backbone architectures, or backbone-like architectures with only PLR’s (and a pure master/slave architecture) can be built without violating any guidelines or constraints. However, those networks do not follow a desirable architecture.
With “real” routers, the configured router is the type of choice. All modern network management tools support configuring and automatically administer such routers. There’s hardly a reason for having a learning router.
Refer to LONWORKS Routers and Repeaters job aid starting on the following page and the Miscellaneous Infrastructure Devices job aid following that.
LONMARK 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.

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

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

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

27. Network Interfaces LM Exam
4-14
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
LM Exam
LonTalk I/F – h/w that connects PC to LonTalk medium
RNI – LonTalk interfaces that are connected over IP
VNI has greater throughput than NSI
VNI Virtual Network Interface - the ability to abstract multiple logical network interfaces from a single high performance network interface (PCLTA-20, PCC-10, Ethernet NIC)
Which NSI ?
Network Tool

28. Connectivity Options LM Exam
4-15
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 10
(Router Option)
i.LON 600
i.LON SmartServer
i.LON
SmartServer
PCLTA-20:
TP-1250 SMX
PCLTA-21:
FT-10, TP-78,
TP-1250, RS-485
Modem
PCI
PCMCIA
EIA-232
IP-852 Routing
10/100 Ethernet IP/RNI
USB
Modbus IP
LM Exam
LonTalk I/F – h/w that connects PC to LonTalk medium
Have samples available to pass around class
* PSTN – Public Switched Telephone Network (also called POTS – Plain Old Telephone Service
* PPP – Point to Point Protocol (IP)
Network Interfaces:
Available in almost any PC form-factor, transceiver type, and bus configuration
All of these network interfaces are LNS compatible
TCP/IP – Used by the i.LON 10, i.LON 100 and i.LON 100 to provide remote IP connectivity
LonWorks /IP - creates a n EIA-852 standard LonWorks to IP channel (IP-852) and is used by the i.LON 600 and i.LON 100 (with IP-852 Routing).
Modbus IP – Used by the i.LON SmartServer to communicate with TCP/IP enabled Modbus devices.

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

30. Installing the
Physical Network

31. Objectives Define infrastructure installation tasks
5-2
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. Installation Tasks LM Exam
5-3
IMPLEMENT THE NETWORK
Identify
Architectures
Select Network
Components
Install Physical
Network
Program
Commission
Test and Verify
Optimize
Document
Maintain
DOCUMENT AND MAINTAIN
PLAN THE NETWORK
TEST AND OPTIMIZE
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
LM Exam
Large portion of all communication problems can be traced to faulty wiring
Most LONWORKS network problems can be traced back to an inadequate installation of cables and devices.

33. Cabling Installation LM Exam
Last two bullets
5-4
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
LM Exam
Lightning-current arrestor needed anytime TP goes outside building
Lightning may cause device failure due to power surge
Keep cables nominal distance from AC cables to minimize magnetic inductive interference
TP may be in same bundle as low voltage AC or DC
Follow local and national regulatory requirements for electrical shock protection
Connect TP to device– two wires, polarity insensitive
Use lightning-current arrestor needed anytime twisted pair goes outside building
Follow local and national regulatory requirements

34. Tested Twisted Pair Cable Type Limitations
LM Exam
Go over various limits
5-5
Bus Topology
Free Topology
Max Stub
Max Bus Length
Max Node-to-Node
Max Total Cable
ISO/IEC
3 meters
600 meters
250 meters
450 meters
Specified
TIA 568A Category 5
TP/FT-10
TP/XF1250
0.3 meters
900 meters
130 meters
Validated
Beldon 8471
2700 meters
400 meters
500 meters
Beldon 85102
Level 4/
Level IV
1400 meters
JY (st)
320 meters
LM Exam
Level 4 acceptable for use with TP/FT-10, TP/XF-78 and TP/XF-1250
LM Interoperability Guidelines details Cat 5 for TP/FT-10
Not recommended – 24 AWG shielded untwisted

35. Grounding Shielded Twisted Pair Cable
5-6
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.
LM Exam
Communication wires not grounded

36. Job Aids
5-7
LM Exam
Mention lightning current surge arrestors needed if bus cables go beyond build borders and are not installed in metal ducts.
Suggest studying section for exam
Cabling Installation – Procedures
Cabling Installation – Common Pitfalls
Miscellaneous Infrastructure Components
LM Exam
Point out the various areas marked with LM Exam study icon in Cabling Installation - Procedures
You’ll not go through all of this in detail in class, but you’ll probably want to skim through what is here and look at 1 or 2 examples in detail so students will be aware of the job aids when they return to their jobs

37. Termination: What is it?
5-8
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 mF
52.3Ω Free Topology
105Ω Bus Topology
TP/FT-10 TP/LP-10 TP/LP-11
Channels
LM Exam
Bus – 2 terminators ( ohms), one at each end of cable
Type of termination – RC
Free topology single 52.3 ohm resistor
Dampen resonance of date signal
Note: While termination can go anywhere on the segment, if you always install it near the router, you will always know where to look for it.
0.15 mF
59Ω
340Ω
102Ω
0.33 mF
TP/XF-78 TP/XF-1250
Channels
100Ω
0.47 mF
Power Line
Channels

38. Device Installation Mount devices as close to I/O as possible
5-9
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
LM Exam
Just about everything on slide and in workbook
5-10
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-709.3) 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
LM Exam
Power and Communication on single pair of wires
Link power can operate TP/FT-10 channel
Sum current of all LP devices on 5V side must be larger than 3.2A
Voltage at supply 41 – 42.4
42 VDC and 78 kbps on TP/FT-10 channel
Beldon evenly distributed devices at 50 mA
TP/FT-10 device designed to can be used on network with LPT devices
Memorize LPT / FT formula

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

41. Summary and Review
5-12
What can most LonWorks network problems be traced back to?
Inadequate installation of cables and devices
How can you avoid magnetic inductive interference when laying cables?
Keep nominal distance from AC cables .
Separate from RF and high voltage sources.
What must be used anytime twisted pair cable goes outside of a building?
Lightning-current arrestor
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.
How many non-link powered devices can be added to a segment which already has 56 link-powered devices?
36 (128 – 56) / 2
Where and how should shielded cable be grounded?
At minimum once per segment, preferably at each device
Inadequate installation of cables and devices
2. Keep nominal distance from AC cables . Separate from RF and high voltage sources
3. Lightning-current arrestor
4. Free: One, anywhere on segment. Bus: Two, one at each end of segment.
(128 – 56) / 2
6. 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 LONWORKS 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. L1-1
Lab 1, Case Study 1
Modem
SLTA-10
PSTN
NM Tool
NSI
HMI Tool