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EVLA MONITOR AND CONTROL HARDWARE REQUIREMENTS

This document outlines the basic requirements for the EVLA hardware monitor and control system, including fieldbus, data rates, timing, RFI, MIB, and transition requirements.

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EVLA MONITOR AND CONTROL HARDWARE REQUIREMENTS

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  1. EVLA MONITOR AND CONTROL HARDWARE REQUIREMENTS EVLA Hardware Monitor & Control PDR March 13, 2002

  2. BASIC REQUIREMENTS • All Monitors/Controls Available Online • Fieldbus • Data Rates • Timing Requirements • RFI Requirements • MIB Requirements • Transition Requirements EVLA Hardware Monitor & Control PDR March 13, 2002

  3. FIELDBUS • 1 Gigabit Full Duplex Switched Ethernet Between Control Building and Antennas • 100 Megabit Full Duplex Switched Ethernet to EVLA Modules EVLA Hardware Monitor & Control PDR March 13, 2002

  4. WHY ETHERNET? • COTS Equipment Available • Maintainable Due To Widespread Commercial Use • Large Packet Size => Low Overhead • Protocols Built Into Operating Systems • High Data Rates EVLA Hardware Monitor & Control PDR March 13, 2002

  5. WHY ETHERNET? • Allows Same Fieldbus for Entire Monitor and Control System • Slot Addressing Scheme Possible • Convenient to Place Control Computer On Any Part of the Network • Indeterminacy is Not a Problem Because of Using a Switched Network EVLA Hardware Monitor & Control PDR March 13, 2002

  6. DATA RATES • Maximum Monitor Data Rate From EVLA Antenna Estimated At 200 Kbits/Second • Maximum Monitor Data Rate From EVLA Module is 128 Kbits/Second • Maximum Command Data Rate is Much Slower EVLA Hardware Monitor & Control PDR March 13, 2002

  7. TIMING REQUIREMENTS • Commands Must Be Implemented Within 100 µs of Intended Implementation Time • Monitor Response Time is 10 – 100 ms • Monitor Data Must Be Gathered, Time Stamped, Sent to an Archive EVLA Hardware Monitor & Control PDR March 13, 2002

  8. TIMING REQUIREMENTS • Monitor and Control System Must Keep Absolute Time to Resolution of Better Than 10 ms • Accuracy of Absolute Time Must be Within 10 ns EVLA Hardware Monitor & Control PDR March 13, 2002

  9. RFI REQUIREMENT • Design for Minimum Emission of RFI • Some Choices Driven By This Requirement EVLA Hardware Monitor & Control PDR March 13, 2002

  10. MODULE INTERFACE BOARD (MIB) • Interfaces Fieldbus To Module • Must Be Small In Size • Must Be As Simple As Possible • Ability to Implement Some Control Tasks Pertaining to Module Being Controlled • Must Implement the Fieldbus Protocol EVLA Hardware Monitor & Control PDR March 13, 2002

  11. MODULE INTERFACE BOARD (MIB) • Must Implement Module Communication Protocols • A MIB Is Not Specific To a Module – It Obtains its Software From The Module • Must be Able to Send Monitor Data Periodically, or On Demand EVLA Hardware Monitor & Control PDR March 13, 2002

  12. TRANSITION REQUIREMENTS • VLA and EVLA Monitor and Control Systems Must be Used Concurrently During EVLA Construction • A Combination of Old and New Modules Must Be Supported During Construction • Prohibit or At Least Minimize Use of VLA Modules in EVLA Antenna EVLA Hardware Monitor & Control PDR March 13, 2002

  13. OTHER REQUIREMENTS • Telephone System – VOIP • Antenna Control Unit (ACU) – Servo System • Utility Module EVLA Hardware Monitor & Control PDR March 13, 2002

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