Inmarsat-C Physical Layer Tester (CPLT)

Square Peg Communications Inc.’s Inmarsat-C Physical Layer Tester (CPLT) is a software application that runs on the generic high-rate Physical Layer Tester (PLTH) platform. The CPLT supports testing of the physical layer performance and protocol implementations of Inmarsat-C Mobile Earth Stations (MESs) and Land Earth Stations (LESs).

The CPLT supports all of the Inmarsat-C2 channel types using DSP-based modem technology. An Ethernet interface allows various options for control of the CPLT or for control of external equipment by the CPLT. A serial interface is also provided to allow communication with an MES under test.

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

The CPLT also provides a Test Sequencer user interface compatible with that used with legacy Inmarsat-C test equipment. This facility allows users to execute existing type approval RTP scripts, while the channel simulator and signal analysis facilities provide the means of demonstrating compliant physical layer performance.

• Configuration
• Capabilities
• Downloads
• Hardware

• CPLT Configuration for MES Testing

  

  (Not all components are required for all test applications)

• Transmit Capabilities

  Physical channels	3 simultaneous (optional 4th channel)
  Channel types	TDM (1200 sym/s BPSK) SIG (600 / 1200 sym/s BPSK) MSG (600 / 1200 sym/s BPSK) Test tones (CW, two-tone, etc.)
  Channel impairments	Independently-specifiable parameters: Fixed carrier frequency error, burst frequency jitter Doppler rate, peak offset Reacquisition carrier offset Adjacent channel interference level and frequency offset Co-channel interference level Continuous phase noise spectrum, level Discrete phase noise level and freq offset Fading model, bandwidth, C/M ratio Phase and/or amplitude jump distribution, magnitude, interval Transmission path delay, burst timing jitter Symbol rate error HPA non-linearity AWGN

  Receive Capabilities

  Physical channels	3 simultaneous (optional 4th channel)
  Channel types	TDM (1200 sym/s BPSK) SIG (600 / 1200 sym/s BPSK) MSG (600 / 1200 sym/s BPSK) Unframed
  Signal analysis	Signal capture (raw samples and soft decisions) Selectable pass/fail limits for measurements: Carrier frequency offset Average power, power rate of change Phase change Integrated phase noise Burst timing offset Symbol clock rate error Constellation mean-squared error, EVM Eb/No loss Uncoded errors Power profile Spectral shape Out-of-band emissions Phase noise spectrum

  Ethernet Interface Capabilities

  Medium	10/100BaseT
  Functionality	Remote control interface (e.g., to LabView™ or Windows remote desktop) GPIB (IEEE-488) interface (with Ethernet-to-GPIB converter)

  Logging Capabilities

  General	Test Sequencer interface messages Transmitted/received packet 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	Procedure-based (like Basic, C or Pascal) Functions for string processing, math, user interaction, logging, I/O (serial, TCP/IP, GPIB) Integrated development environment
  CPLT-specific	Configuring and controlling modems Sending and receiving Inmarsat-C packets Controlling channel simulator Sending and receiving messages to simulate the Test Sequencer

   

• CPLT Data Sheet

  

• Physical Layer Tester (PLT-H)
  • Requires MSS L-band Radio Frequency Unit (RFU) for operation at L-band
  
  Physical Layer Tester (PLT-L)
  
  MSS L-band Radio Frequency Unit (RFU)
  
  ATC Interface Unit (AIU)