Mini-M/M4 Physical Layer Tester (MPLT)


Square Peg Communications Inc.’s Mini-M / M4 Physical Layer Tester (MPLT) is a software application that runs on the generic Physical Layer Tester (PLT) platform. The MPLT supports the testing of physical layer performance and protocol implementation of Land Earth Stations and Mobile Earth Stations implementing Inmarsat Mini-M, M4, Fleet 33/55/77 and Swift 64 services.

The MPLT supports all of the Mini-M / M4 channel types using state of the art DSP based modem technology. A variety of interfaces are provided enabling external devices to be connected through the MPLT to the equipment under test.

The MPLT 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 MPLT and equipment under test to be exercised in automated testcases and suites.

The MPLT has been successfully used by manufacturers worldwide in the type approval of MESs and the authorization of LESs. 

The M4Net NCS/LES emulator can also be used with the MPLT to provide emulation of the end-to-end network.

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

  • Transmit Capabilities

    Modulators

    5 simultaneous

    Channel types

    TDM (6 kbps BPSK)
    TDMA (3 kbps BPSK)
    ALOHA (3 kbps BPSK)
    mini-M (2.8 ksps OQPSK)
    M4 (33.6 ksps 16-QAM)
    Test tones (CW, two-tone, etc.)

    Channel impairments

    Independently-specifiable parameters:

    • Fixed carrier frequency error
    • Doppler rate, peak offset
    • Reacquisition carrier offset
    • Adjacent channel interference level and frequency offset
    • Co-channel interference level
    • I/Q gain and phase imbalance
    • Continuous phase noise spectrum, level
    • Discrete phase noise level
    • Fading model, bandwidth, C/M ratio, differential delay
    • Phase jump distribution, magnitude, interval
    • Amplitude jump distribution, magnitude, interval
    • Transmission path delay
    • Symbol rate error
    • HPA non-linearity
    • AWGN

    Receive Capabilities

    General

    Protocol Tester interface messages
    Transmitted/received SUs and SCPC data
    Test sequence progress and outcome
    System events, faults, and abnormal conditions

    Signal analysis

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

    Script Capabilities

    General

    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

    MPLT-specific

    Configuring and controlling  modulators and demodulators
    Flexible definition of SU formats
    Sending and receiving SUs and SCPC data
    Controlling channel simulator
    Generating signal blockage events
    Sending and receiving messages to simulate the Protocol Tester

    Logging Capabilities

    General

    Protocol Tester interface messages
    Transmitted/received SUs and SCPC data
    Test sequence progress and outcome
    System events, faults, and abnormal conditions

    Signal analysis

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

  • MPLT 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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