IsatData Pro Physical Layer Tester (DPLT)

The IsatData Pro Physical Layer Tester (DPLT) supports testing of the physical layer performance and protocol implementation of Mobile Terminals (MTs) implementing Inmarsat’s IsatData Pro (IDP) services.

The DPLT application runs on the SPCI Physical Layer Tester Multi-Channel Platform (PLT M) and is referred to as DPLT on MCP or DMCP.

  • Typical DMCP Configuration for MT Testing

  • Transmit Capabilities


    4 simultaneous

    Channel types

    Bulletin Board
    To-mobile (forward traffic)
    From-mobile (return traffic/ack sub-channels)
    Test tones (CW, two-tone, etc.) and raw samples

    Channel impairments

    Independently-specifiable parameters:

    • Fixed carrier frequency error
    • Burst frequency jitter
    • Sinusoidal Doppler peak rate and offset
    • ACI level and frequency offset
    • CCI level
    • I/Q gain and phase imbalance
    • Continuous phase noise spectrum, level
    • Discrete phase noise level, frequency offset
    • Fading model, bandwidth, C/M ratio
    • Phase and amplitude jump distribution, magnitude, interval
    • Periodic signal blockage (e.g., helicopter)
    • Transmission path delay
    • Burst timing jitter
    • Symbol rate error
    • HPA non-linearity
    • AWGN C/No

    Receive Capabilities


    4 simultaneous

    Channel types

    Bulletin Board
    To-mobile (forward traffic)
    From-mobile (return traffic/ack sub-channels)
    Unframed (raw samples)

    Demodulator features

    Auto-identification of return burst type, optimized for transmitter performance testing

    Signal analysis

    Signal capture (raw samples and soft decisions)
    Signal replay (from raw samples)
    Selectable pass/fail limits for measurements:

    • Carrier frequency offset and drift
    • Average power, power rate of change
    • Phase change
    • Integrated phase noise
    • Burst timing offset
    • Symbol clock rate error
    • I/Q gain and phase imbalance
    • Constellation MSE, EVM^2
    • Eb/No loss
    • Uncoded errors
    • Power profile
    • Spectral shape
    • Spurious emissions
    • Phase noise spectrum

    Ethernet Interface Capabilities




    Protocol Tester interface, remote control interface, MT control interface, MPC interface for ESE emulation, GPIB interface (with Ethernet-to-GPIB converter)

    Logging Capabilities


    Transmitted/received packet data
    Test sequence progress and outcome
    Protocol Tester interface messages
    System events, faults, and abnormal condition

    Signal analysis

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

    Script Capabilities


    Procedural (similar to C or Basic)
    Functions for string processing, math, user interaction, logging, I/O (serial, TCP/IP, GPIB)
    Integrated development environment


    Controlling the Tx and Rx channels
    Sending and receiving IDP packets
    Controlling channel impairments
    Sending and receiving MT control messages


  • DMCP Data Sheet

    DPLT Use Cases

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