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MTSC Training Course Industrial Wireless Prepared by: Joe dela Cruz Date: 06-08-2010.

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Presentation on theme: "MTSC Training Course Industrial Wireless Prepared by: Joe dela Cruz Date: 06-08-2010."— Presentation transcript:

1 MTSC Training Course Industrial Wireless Prepared by: Joe dela Cruz Date:

2 Training Topics

3 The Basics Wi-fi concepts, Cellular Concepts Antennas and Long Distance Knowledge AWK Series Killer Functions Turbo Roaming Dual RF Redundancy and Bridging VLAN & QoS OnCell Series Killer Functions OnCell Central Manager Routing function

4 In This Section You Will Learn… Whats new with AWK and OnCell products Whats important about antennas and long distance communications.

5 Wi-Fi Basics

6 What is a Wireless Network? A network of devices communicating over radio waves. A wireless network eliminates data cables.

7 What is Wi-Fi? Three short-range, unlicensed radio technologies: IEEE a, b, and g StandardFrequency Max/Real Throughput Compatible with b Typical Range b2.4 GHz 11 Mbps/ 5 Mbps Yes Indoor: 100m Outdoor: 200m g2.4 GHz 54 Mbps/ 20 Mbps Yes Indoor: 100m Outdoor: 200m a5 GHz54 Mbps/ 20 Mbps NoIndoor: 50m Outdoor: 100m

8 802.11b/g b speeds: 11, 5.5, 2, 1 Mbps g speeds: 54, 48, 36, 24, 28, 12, 9, 6 Mbps Actual throughput: ~50% of supported speeds (due to network overhead) Channels: 1~11 (US), 1~13 (EU), 1~14 (JP) Recommended channels of use: 1, 6, 11 (avoid frequency overlap) Regulations: FCC (US), ETSI (EU), ARIB (JP)

9 802.11b/g Advantages/Disadvantages Advantages: Widely used Backwards compatibility Longer communication distance Disadvantages: More susceptible to interference (more devices communicating in 2.4 GHz band) Overlapping channels

10 802.11a a speeds: 54, 48, 36, 24, 28, 12, 9, 6 Mbps Actual throughput: ~50% of supported speeds (network overhead) 5GHz Frequency bands (4 channels each): UNII-1, UNII-2, UNII-3 Ex: UNII-1 contains ch. 36, 40, 44, 48 (all non-overlap channels) Regulations: FCC (US), ETSI (EU), ARIB (JP)

11 802.11a Advantages/Disadvantages Advantages: Less susceptible to interference (fewer devices communicating in 5 GHz band) All non-overlapping channels Regulators allow higher transmit power at higher frequencies Disadvantages: Shorter communication distance Not compatible with b/g

12 Radio Signal Specs SpecsDefinitionMeasure UnitWhy Important? Frequency Range The range of radio frequency which the signal is transmitting MHz/GHz -Radio Signal frequency range has to match antennas frequency spec. -Difference frequency range may have different interferences Loss Loss of power in the radio signal dB/dBm -Loss weakens the signal strength -Use low loss cables Transmit (Tx) Power The power level of the signal being transmitted mW/dBm -Higher the power, further the distance -Power regulations in different countries Receive (Rx) Sensitivity The recognizable power level of the signal at the receiving end dBm-Higher sensitivity, further the distance -High gain antennas helps sensitivity

13 AP/Client Concept Access Point (AP) A wireless hub Service wireless clients Provide filtering and security Client Mobile wireless device Wireless bridge for sub-networks Capable of roaming between APs Backbone LAN 1 Client LAN 2 Client AP

14 AP/Client Specs and Settings Operation mode: Device plays role of AP or Client RF type: Select RF mode Channel: AP and Client will use the same channel SSID: AP and Client much have SAME SSID for association SSID broadcast: AP broadcast SSID for passive scanning client WDS: AP/Client connection if not enabled.

15 WDS/Bridge Concept WDS (Wireless Distribution System) Bridging APs Wirelessly connect multiple BSS and LAN Fixed location communication Backbone LAN 1 AP

16 Different WDS Configurations

17 WDS Specs and Settings WDS: Device plays the role as bridge AP functionality: Device also plays the role as AP (allows client connection) WDS Settings: Enter MAC address of each bridge device in WDS link.

18 What is throughput? Throughput is the actual data rate the device can transfer data. In WLAN devices, throughput is roughly half of theoretical data rate (when bandwidth is not shared) One should measure throughput to determine if actual data rate meets requirement.

19 Confidential Jperf: WLAN throughput measurement tool. Throughput Measuring Tool

20 Cellular Basics

21 What is Cellular? A radio communication system that can send data over a wide area A wireless network that gives access to network subscribers through base stations


23 2G/3G Telecom Technology 2G: CSD/SMS/GPRS/EDGE 3G: UMTS/HSDPA ServiceDownloadUploadCharge Rate CSD9.6 kbps By connection time SMS1120 bits/msg By number of message GPRS80 kbps20 kbps By amount of data traffic EDGE237 kbps59 kbps By amount of data traffic UMTS384 kbps64 kbps By amount of data traffic HSDPAUp to 7.3 mbps384 kbpsBy amount of data traffic

24 What is CSD? CSD Like reserving a seat for dining: Exclusive Service, Needs Setup Peer-to-Peer Connection Low cost, charges are just like Voice Calls Stands for GSM Phase 2 Circuit Switched Data

25 Modem Modem and CSD via PSTN COM1 Legacy DOS software Serial CNC machine Serial CNC machine Serial CNC machine Establish connection Transmit and receive data Establish connection Transmit and receive data CSD Features -Simulates a long serial cable -Dynamic destination

26 CellularStation ElectricMeter ElectricMeter ElectricMeter OnCell G2150 CSD Application ElectricMeter 2. Transmit and receive data 1. Establish connection CellularStationCellularStation PBX / Administrator

27 AT Command Dialing Modem A Modem B ATD RING ATA CONNECT CONNECT abcd1234 abcd OK ATH OK NO CARRIER RINGRING… Data Mode Dialing (Command Mode) Command Mode

28 What is GPRS? GPRS Typically charged per megabyte of transferred data Stands for General Packet Radio Service When Will You Need GPRS? If you need ADSL-like modem behavior If you want to use the Internet…

29 2.5G – GPRS (General Packet Radio service) Mobile Data Service available to GSM users GSM combined with GPRS is called 2.5 G Billed per kbyte/Mbyte/package (128 bytes) Packet Switched PPP, IP supported MMS (Multimedia Message Service) Push Mail High-speed Internet access for mobile phones High-speed Internet access for PCs

30 What is APN? APN (Access Point Name) is the domain name for gateway to GPRS/internet network APN is different for different countries and cellular operators APN must be set correctly in order to properly register onto the 2G/3G networks Operator may assign private APN for specific users.

31 What is SMS? SMS Short Message Service, for human-readable messages Low data volume: 140 bytes maximum 140 hexa characters or 160 ACSII characters or 70 uni-codes When will you need SMS? If you want to receive text messages… If your application transfers messages infrequently Or you have a low volume of messages

32 SMS to Whom? Ctrl+Z Press Ctrl+Z here Set 7-bits Ascii Send my message to…

33 Youve Got Mail!! Show Me!! Detailed Message & Info

34 SMS Tunnel without AT Commands Serial-to-SMS SMS-to-Serial SMS Data Format Text Binary (8 bits) Unicode (UCS2)

35 Antenna and Long Distance Knowledge

36 Basic Antenna Concept Transmit -Power flow thru induces RF wave Receive -RF wave induces power -Receiver tuned to a specific frequency to pick up specific RF

37 Antenna Selection (Omni Antenna) Longer Distance But narrow range due to the same power

38 Antenna Selection (Semi-Directional Antenna) Yagi Antenna Patch Antenna

39 Characteristics of the Antennas Omni-directional Dipole -360 degree coverage -Short distance applications -Service mobile clients Directional Panel / Patch -Less than 90 degrees of coverage -Long distance applications -Service fixed location clients/bridges.

40 Basic Antenna Spec Example Technical information Frequency MHz Gain 12 dBi Polarization Vertical Beamwidth deg vertical & horizontal Horz.360°Vert.7° VSWR Impedance 50 Ohm Dimensions Length H1500 Weight 850 g Connector N-type / female

41 Antenna Gain Comparison Higher gain means stronger (both) sent and received signals; watch for the regulation in your country Antenna TypeGain Range Omni Antenna2~12dBi Semi-Directive Antenna5~18dBi High Gain Antenna20~40dBi

42 Beamwidth and plane field pattern HPBW – Half Power Beamwidth ( 3dB ) The beam width is about 65° and the gain is about 9 dBi. (Patch panel example)

43 Deployment Consideration Matching polarity on both sides Power Budget – Enough Gain? Low loss? Free space loss – is the distance achievable? Site Survey – Use Network Stumbler Antenna height Antenna alignment (pointing direction) Jperf or Chariot is useful! Use GPS and compass for tuning angle Check RSSI, bit rate, noise level, throughput…

44 Confidential Antenna Polarity Polarity must match (vertical or horizontal)

45 Power Budget WP II AP pigtail cable Lightning Protector RF Cable Antenna WP II Client pigtail cable Lightning Protector RF Cable Antenna + Transmit Power - LOSS Cable/connectors + Antenna Gain - LOSS Cable/connectors RSL ( receive signal level) > sensitivity + Fade Margin - Path Loss over link distance

46 Free space Loss Loss of power in free air Free Space Loss (dB) = Log10(Frequency) + 20Log10(Distance in miles) Lower the frequency for less loss of free space Use 2.4 GHz for long distance!

47 Antenna Height Antenna height helps to avoid obstacles Higher Antenna helps LOS (line of sight) and Fresnel Zone

48 MOXA Wireless Distance Calculator

49 Calculated Distance

50 Antenna Height Estimation

51 Free Space Loss Estimation

52 Antenna Tilting Angle Estimation

53 Flexible and Powerful Solutions for Long-distance Transmission Extend your IEEE applications farther (10-20km) Protocol-level solution (~10km) Communication Parameter adjustment High-gain antenna PHY-level solution (~20km) Booster/ Power Amplifier High-power RF module (200/800mW)

54 APClient Distance TX RX Laptop1 Endpoint 1 Laptop2 Endpoint 2 Enable 200mW Tx Power (Default Disable) Set Distance Fix Antenna to have higher Performance

55 Long Distance Communication Tests 5km testing site 10km testing site

56 Test Results Distance: 5.3 Km 2.4G Antenna Gain Throughput (Mbps) 9 dBi12 dBi18 dBi Tx Rx G Antenna Gain Throughput (Mbps) 9 dBi12 dBi18 dBi Tx N/A Rx N/A Distance: Km 2.4G Antenna Gain Throughput (Mbps) 9 dBi12 dBi18 dBi Tx Under Test Rx Under Test 8.559

57 AWK Series Killer Functions Turbo Roaming

58 Roaming/ Reconnection Steps: RSSI/DR Disconnection Scanning Authentication Association Done Non-proprietary vs. Proprietary Roaming

59 Techniques to improve roaming efficiency 1. Separate the APs properly AP1AP2 AP1 AP2 Lower the frequency of roaming switch and make roaming efficient

60 2. Unify the channel utilization AP1AP2 AP3AP42 Ch=1 Ch=4 Ch=7 Ch=10 AP1AP2 AP3AP42 Ch=1 Ch=6 Ch=1 Ch=6 AP1AP2 AP3AP42 Ch=1 Lower the time consumption of dedicated AP searching to make roaming efficient

61 High Speed Mobile Client

62 Turbo Roaming Technology for Rapid Handovers within WLAN AWK client supports fast handover, even with a speed up to 100km/hr Easy-to-use solution No proprietary protocol or AP needed One click to enable Turbo Roaming No performance drop during background scanning

63 Deploy APs properly and avoid bug light effect and ping-pong effect site survey and planning Avoid unnecessary roaming and make roaming efficient

64 AWK Series Killer Functions Dual RF Redundancy & Bridging

65 Redundant Wireless Link 2.4GHz or 5GHz (Stand-by) Dual-RF (as Master) Dual-RF (as Slave)

66 Redundant Wireless Link 2.4GHz or 5GHz (Active) Dual-RF (as Master) Dual-RF (as Slave) The wireless link is recovered, but some packets may be lost…

67 Highly Stable and Reliable Wireless Network – Redundant Dual RF Solution (1) (2) (3) (4)

68 Advanced Redundant Wireless (1) 2.4GHz or 5GHz (Concurrently used) Chance for better Throughput AWK-5222 (as Master) AWK-5222 (as Slave) The wireless link can perform quite well in a normal state.

69 Advanced Redundant Wireless (2) 2.4GHz or 5GHz (in use) AWK-5222 (as Master) AWK-5222 (as Slave) The wireless link remains, and no packet will be lost… Max throughput for the utilized channel

70 Dual RF AWK-5222/6222 – Wireless Redundancy Mode

71 Also supports single RF clients

72 Dual RF – Wireless Bridge Mode

73 High-performance Wireless Bridging for NLOS Communication WLAN1 as slave WLAN2 as Master WLAN1 as slave WLAN2 as MasterWLAN1 as slave WLAN2 as Master WLAN1 as slave WLAN2 as Master

74 The local clients can be served as well… WLAN1 as slaveWLAN2 as Master WLAN1 as slave WLAN2 as Master AWK-3121 (Client mode)

75 Bridge Mode – Provide Extra AP Function

76 AWK Series Killer Functions VLAN & QoS

77 What is multiple SSID? An SSID is similar to a wireless LAN port, wherein an SSID serves clients with the same SSID. An AP with multiple SSIDs can allow clients with different SSIDs to connect to the AP (similar to devices connected to different ports on a switch) Client SSID = HOME Client SSID = GUEST AP SSID1 = HOME SSID2 = GUEST

78 Multiple SSID + VLAN Wireless VLAN (802.1Q) can be realized based on SSID grouping. Client SSID = HOME Client SSID = GUEST AP SSID1 = HOME SSID2 = GUEST Client SSID = HOME Client SSID = GUEST Wireless VLAN1 Wireless VLAN2 TRUNK VLAN SW

79 Multiple SSID Settings SSID1 SSID2


81 Why is QoS (quality of service) important? Give priority to strict latency data traffic such as multimedia data (voice > video > best effort > background) Improve user experience for voice and video streaming applications. Traffic contention management The Wi-Fi Alliance started interoperability certification for WMM (Wi-Fi Multimedia) as a profile of the IEEE e QoS extensions for networks. Download WMM for WiFi whitepaper from WiFi Alliance:

82 Example: Wi-Fi Multimedia Network

83 WMM Access Categories

84 Example of effect on WMM on a video stream

85 Enable WMM on AWK WMM Enabled

86 Confidential AWK WMM test results WMM Enabled WMM Disabled

87 OnCell Series Killer Functions OnCell Central Manager

88 What is the problem with having private IPs? Private IPs are hidden from the public domain If both Host and Modem have private IPs, they will not be able to see each other and thus cannot communicate

89 OnCell Central Server Device Host Private IP Domain Public IP Domain Private IP Domain Ethernet Serial OnCell Device Ethernet Device Serial Device OnCell Central Manager Issues with Private IP

90 MOXAs Solution: OnCell Central OnCell Central Server allows private IP hosts and OnCells to communicate with each other.

91 OnCell Central Basic Idea Host and OnCell both make connection with OnCell Central Server OnCell Central Server assigns designated ports for Host to connect to Serial and/or Ethernet devices attached to OnCell OnCell Central Manager allows Host to monitor the connection status of OnCell and devices

92 OnCell Central Server Install OnCell Central Manager Select Network Connection Interface Set Control Ports Set User Ports STARTUP

93 OnCell Device Configuration Set Ethernet Device Enable OnCell Central Server Set Device Settings

94 OnCell Central Server Device Host Ethernet Serial OnCell Device Ethernet Device Serial Device OnCell Central Manager TCP Client TCP Server Private IP Public IP Private IP Solution: Public IP address + Port #

95 Connection and management of remote devices Standard TCP/IP socket connection Compatibility with application software

96 OnCell Series Killer Functions Routing Function

97 Ethernet data can be transferred transparently via cellular network to establish remote control of Ethernet devices LAN routed to Internet Connection to the internet

98 Confidential NAT Routing Function NAT function allows LAN data to be routed onto the public WAN port OnCell G3100 has NAT automatically enabled OnCell 5004 has NAT manually enabled

99 Virtual Server Mode A virtual server device acts as a server device on the public domain The virtual server device port forwards data to the actual physical server Connection from the internet

100 Click System Management Misc. Network Settings Virtual Server Settings 2.Select TCP 3.Enter TCP Clients (Host) Dest. Port. 4.Enter TCP Servers (Ethernet Device) LAN IP 5.Enter TCP Servers (Ethernet Device) Local Port 6. Check Enable 7. Click Submit 23 6 OnCells Virtual Server Mode

101 Static Routing OnCell 5004 supports static routing

102 Thank you for joining MTSC 2009!

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