IPDS MES Physical Layer Tester (IPLT)

Square Peg Communications Inc.’s IPDS MES Physical Layer Tester (IPLT) is a software application that runs on the generic Physical Layer Tester (PLT) platform. The IPLT supports the testing of physical layer performance and protocol implementation for Mobile Earth Stations implementing Inmarsat Packet Data Services (IPDS / MPDS) and packet based Fleet 77 and Swift 64 services.

The IPLT supports all of the MPDS channel types using state of the art DSP based modem technology. Real time signal analysis is performed on all received bursts in real time.

The IPLT is a powerful and flexible test tool but is easy to use. A familiar Windows based user interface provides easy access to test functions, while a powerful scripting language allows every feature of the IPLT and equipment under test to be exercised in automated testcases and suites.

The IPLT has been successfully used by manufacturers worldwide in the development and type approval of MESs. 

  • (Not all components are required for all test applications)

  • Transmit Capabilities

    NCS modulators

    2 simultaneous

    LESP/MESP modulators

    2 simultaneous

    LESP/MESP channel impairments

    Independently-specifiable parameters:

    • Fixed carrier frequency error
    • Peak Doppler rate/offset
    • Reacquisition carrier offset
    • Adjacent channel interference
    • Co-channel interference
    • I/Q phase imbalance
    • I/Q gain imbalance
    • Continuous phase noise
    • Discrete phase noise (99 Hz from carrier)
    • Fading bandwidth, C/M ratio, differential delay
    • Phase jump size, interval
    • Transmission path delay

    Receive Capabilities

    MESP demodulators

    2 simultaneous

    MESP signal analysis

    1 selected MESP channel
    Burst capture (raw samples and soft decisions)
    Burst replay (from raw samples)

    MESP signal analysis

    Selectable pass/fail limits for measurements:

    • Carrier frequency offset
    • Average power
    • Integrated phase noise
    • Burst timing offset
    • Symbol clock rate error
    • I/Q gain and phase imbalance
    • Constellation mean-squared error
    • HPA compression
    • Eb/No loss
    • Uncoded errors
    • Power profile
    • Power spectrum
    • Out-of-band emissions
    • Ramp-up/ramp-down emissions
    • Phase noise spectrum

    Logging Capabilities


    Protocol Tester interface messages
    Transmitted/received PDUs
    MESP user data
    Test sequence progress and outcome
    System events, faults, and abnormal conditions

    MESP signal analysis

    Signal analysis measurements
    Signal analysis statistics
    Raw input samples
    Demodulator soft decisions

    Script Capabilities


    Looping and conditional structures
    User-defined variables and procedures
    Compile-time symbol substitution
    Conditional compilation
    User input and interaction
    Logging and displaying events and results
    Integrated development environment


    Configuring and controlling modulators and demodulators
    Sending LESP and MESP PDUs
    Sending NCS SUs
    Receiving MESP PDUs
    Generating signal blockage events
    Sending and receiving messages to simulate the Protocol Tester

  • IPLT Data Sheet

  • Physical Layer Tester (PLT-H) Physical Layer Tester (PLT-L)

    MSS L-band Radio Frequency Unit (RFU)

    ATC Interface Unit (AIU)

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