ESTeem Wireless Modem Overview - FTP site - Esteem

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					                 Wireless Serial Overview
ESTeem Training Class
       Serial Over Broadband

• Serial Interface on 195E products
• Serial Data Transferred Over Ethernet System
  – Configure Ethernet links first
  – Troubleshooting and diagnostic of WLAN network
• Serial Links are Transparent
• Two Modes of Operation
  – Point to Point
  – Multicast
             Serial Interface Layout
                   RS-232     Second       RS-232
     Reset Switch Data Port   Ethernet                   RJ-45 10/100BaseT
                                         Configuration
                                Port                       Ethernet Port
Status
 LED                                                            Aux Power
                                                                  LED




   Receive        Transmit         Power over            12 VDC Input
    LED             LED           Ethernet LED             (Auxiliary
                                                          Connector )
       Serial Port Configuration
• Single Page Configuration on Setup
  – Data Rate, Parity, Start/Stop Bits
  – Transmission Characters
  – Data Format
• Multipoint System
  – All remote sites will receive the data
  – Set to multicast address
• Separate Networks with Port Number
      Serial and Ethernet Networks

• Hybrid of Both Serial and Ethernet Interface
• Both Serial and Ethernet Network Can Work
  Simultaneously
  – Legacy systems
  – Adding in new locations to existing site
  – Providing video link on serial network
• Serial Network has Little Impact on Bandwidth
      Theory Of Operation (Licensed)

• Narrow Band Packet Burst
  – Single Narrow Band Radio Channel
  – Carrier Sensed Multiple Access (CSMA)
    • Listen before transmit
    • Multiple users on one frequency
  – Collision Detection
    • Fixed delay + random variable = time
       Theory Of Operation (Licensed)
• Networking
  – Single Frequency Channel
    • Model 192C/CHP/M/MHP/F
       – 1600 channels (12.5 kHz spacing)
       – 3200 channels (6.25 kHz spacing)
  – Up to 256 cells per channel
    • Network ID
    • Range 0 to 255
  – 254 Users per cell
    • Unit Address
    • Range 1 to 254 per cell
         Theory Of Operation (Licensed)

• Spectrum Utilization
  – Multiple frequencies available in band
     •   20 kHz channel spacing in low band VHF
     •   12.5 kHz or 5 kHz channel spacing in high VHF
     •   25 kHz channel spacing - UHF (Grandfather)
     •   12.5 kHz channel spacing - UHF (Current)
     •   6.25 kHz channel spacing - UHF (?)
  – Simplex Radio
     • Only one channel needed per site
      Theory Of Operation (Licensed)

• Digi-Repeating
  – Store and Forward Data Transfer
  – Maximum of Three Repeaters in Any String
  – Acknowledge comes from destination ESTeem - not
    from first repeater
     Digi-Repeating Diagram
                                                               Add 30

                      Data                             D
Add 20                            2nd Repeater          at
                                                          a


                1st Repeater
                                      3rd Repeater
         Data




                                                             Add 40
                                                  ta
                                             Da



   Source
Add 10                  Destination
                             Add 50
       Theory Of Operation (Licensed)

• Error Detection
  – Forward Error Correction
     • Every 4th Bit is Error Correct
  – 32 Bit CRC
  – Retry
      Noise Immunity

• High EMF Noise Rejection
  – Narrow Band FM
  – CSMA-CD
• Error Detection
  – Retry
  – Forward Error Correction
• Receiver Squelch
  – Narrow receiver band
  – Four level squelch
      Packet Protocols

• Master/Master Communications
  – Any ESTeem can act as master
  – No dedicated Master/Slave relationship
  – Simplicity in maintaining spares
• No Token Packets
  – Transmit only when data to send
  – Opens up radio spectrum for multiple users
      Data Privacy

• Network Privacy
  – Address
    • 1 to 254
  – Network ID
    • 0 to 255
  – Operating Frequencies
    • 1600 @ 12.5 kHz
    • 3200 @ 6.25 kHz
      Data Privacy

• Network Privacy
  – Programming Lockout Codes
    • Security ON/OFF
       – 0 to 65,536
  – Data Rate
    • 51
  – Embedded Subcode
    • Internal Firmware
    • 0 to 255
  – Total Combinations to Access Data
    • 1 in 1.35 Trillion (1.35 E12)
          Packet Frame Block Diagram
                                Transmitted Frame

                                                               Data
  Start                                                                           32 Bit CRC
          Network Destination      Source                1 to 2000 Bytes
                                                                                  Polynomial
  Flags            Address         Address              (8 to 16000 Bits)


                     Frame Overhead: 64 to 118 bits


Start Of Transmission
  •Packlength Buffer Full                                                   End Of Transmission
  •Sendpack Character Received
  •Termcontrol Timer Enabled and Timed Out


                               Acknowledge Frame


            Start    Network     Destination          Source         32 Bit CRC
            Flags                 Address             Address        Polynomial
                                    ESTeem Block Diagram


                                       TX BUFFERS                                           TX BUFFERS

                                    TXB2     TXB1       TX




                                                                                                               SERIAL INTERFACE
                                                                                        TXB1
              SERIAL INTERFACE




                                                                           TX                       TXB2
USER DEVICE




                                                                                                                                  USER DEVICE
                                 TX BUFFER SIZE = PACKLENGTH   T/R   T/R    TX BUFFER SIZE = PACKLENGTH


                                    RX BUFFER         RX                        RX             RX BUFFER



                                     RX BUFFER SIZE = 4000 BYTES                     RX BUFFER SIZE = 4000 BYTES



                                 ESTEEM INTERNAL BLOCK DIAGRAM       ESTEEM INTERNAL BLOCK DIAGRAM
       Serial Interface

• DTE Vs. DCE
  – All ESTeem Wired DCE
• Serial Flow Control
  – Software Flow Control
     • XON/XOFF in data stream
  – Hardware Flow Control
     • Assertion of RTS and CTS lines
      Serial Interface

• RS-232C Interface
  – Standard DCE, RS-232C cabling
  – Maximum distance 50 feet (approx.)
                                                        ESTeem
                Personal                                All Models
               Computer
                                                        1   GROUND
               TXD       2                              2   TXD
               RXD       3                              3   RXD
               RTS       4                              4   RTS
               CTS       5                              5   CTS
               DSR       6                              6   DSR
               SIG GND   7                              7   SIG GND
               DCD       8                              8   DCD
                             NOTE: Connect only wires
              25-Pin Male      shown between pins.      25-Pin Male
               Connector                                 Connector
         Serial Interface

• RS-422/485 Interface
  – Greater Distances (up to 4000 feet)
  – RS-485 for Multi-drop Serial Connections

 RS-422/485                        ESTeem                                 ESTeem
 Connection                                      Two Wire       RS
                                   All Models                             All Models
                                                  -485 Connection
                              1     SHIELD GND                       1    SHIELD GND
  TX +                        9     TX +                             14   +   Pos
  TX -                        10    TX -              Pos   +        16   -   Neg
  RX +                        14    RX +             Neg    -
  RX -                        16    RX -
                                                                      25-Pin Male
         Connect only wires
         shown between pins       25-Pin Male                         Connector
                                  Connector
       Communication Interfaces

• Infrared Port (Model 192)
  – No Physical Connection Required
  – Serial Port Converter - Dongle
     • ESTeem AA300
  – 3 Foot Range
      Effective Baud Rate

• Effective Baud Rate
  – Transmitter Turn On Time
  – Packet Overhead
    • Total of 15 ms (Model 192)
  – Effective Baud Rate Table
    • Applicable to file transfer
  – Effected by number of repeaters and size of packets
      Calculating Polling Time

• Packet Overhead
  – 15ms + Data (Bits)/19.2k Baud Each Transmission
• Total Packet Turn Around Time
  – 15ms+Data/19.2k+15ms (Ack)
  – Retry = 50ms
      Calculating Polling Time

• Polling Time
  – Number of transmission in message plus overhead
  – Average retry rate
      Polling Time Example
• Typical Read Message (10 Words)
  – Header
    • 15ms+Data/19200 Baud = 23ms
  – Ack to Header
    • 15ms
  – Read
    • 15ms+Data/19200 Baud = 23ms
  – Ack to Read
    • 15ms

• Conservative Estimate
  – Maximum of ten polls per second
      Communication Schemes

• Point to Point
  – Two ESTeem network
  – Simple configuration
      Communication Schemes

• Contention
  – Priority Messages Have Quickest Response
  – Possible Unknown Communication Loss at Remotes




     Master                                Remotes
      Communication Schemes

• Polled
  – Well Organized Communication
  – Priority Messages Wait on The Poll




     Master
                                         Remotes
      Communication Schemes

• Polled With Report By Exception
  – Combines the Advantages of Polled and Contention
  – Must Add Small Delay After Poll

                                      Emergency
                                       Message




     Master
                                           Remotes
      Licensing

• Bringing Order to Frequency Spectrum Chaos
• Costs and File Times Depend on Coordinators
  Fees
• Licensing Assistance Offices
  – Approx. 6-8 Weeks for new license return from
    coordinator (temporary use)
  – Approx. $700-$1100
  – Interim License As Fast As 4-6 Weeks
ESTeem Training Class
                        Basic System Setup
         Install ESTeem Utility Software




–   Windows™ Based
–   Setup
–   Diagnostic Programs
–   Programming
–   PC Terminal Emulation
–   Full Documentation
        ESTeem Utility (Windows)

• Located on ESTeem
  Resource CD
• Auto-run Menu
• Select ESTeem Utilities
• Open Zip File to Install
      Interfacing ESTeem to PC

                       ESTeem Modem




Personal Computer

                    RS-232 Cable
      Power Supply Setup

• 11-15 VDC Input - All Models
• Molex Power Connectors
                                  ESTeem Modem


   Power Supply AA174




                    Molex Power Cord   Molex Power Cord
                          Male              Female
      Connecting Antenna

• Connect Coax Cable to
  Antenna Port on ESTeem
• Connect Antenna          Magnetic
  Element to Base           Base
                           Antenna


Unit Mount
 Antenna
       Powering Up The ESTeem

• Place DC connector to ESTeem
  – No On/Off Switch                ESTeem Modem
• Indications
  – Power LED = ON
  – Terminal Emulation
     • Welcome Message
     • Command Prompt (CMD:)      Power LED
  – Modem Found on Starting Out
      Using Infrared Port

• 9,600 Baud Only
• 3 Foot Range
• ESTeem Dongle - AA300
  – Initialized with ESTeem Utility
  – Alt-I on keyboard
• Defaults Command Mode when Switch 8 (RS-232
  Connector) = On
  – Must type Ctrl-C for Command Prompt
ESTeem Utility Program
ESTeem Setup
      ESTeem Setup
• ESTeem Setup Guide
  – Familiarize Yourself With ESTeem Operations
  – Basic Programming and Description
  – Programming Wizard Format
• Express Setup
  – ESTeem Programming Without Descriptions
• Test Communications
  – Modem to Modem
  – Loopback
ESTeem Diagnostics
      ESTeem Diagnostics

• Measure Receive Signal Strength
• Radio Interference Testing
• Measure Data Quality
• Polling Diagnostic Testing
  – Save Results to File
• Read and Print Test Results
ESTeem Programming
        ESTeem Programming

• Configure Modes and Features
• All Programming Commands In Users Manual In
  This Section
• Building An ESTeem Command List
  –   PLC Emulation Configuration
  –   Saving Program
  –   Reading Program
  –   Remote Programming
Terminal Emulation
      Terminal Emulation

• Direct Communication with ESTeem
• Manual Programming and Communication
• Setting Frequency and Squelch
  – Finding Frequency and Squelch of attached ESTeem
• Function Keys
  – Custom Programming
  – Diagnostics
       Additional Information

• All ESTeem Documentation Contained on CD-
  ROM Disk
  – Manuals
  – Technical Bulletins
  – Engineering Reports
• About
  – Lists current Utility version

				
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posted:9/23/2013
language:English
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