Physical Layer Tester (PLT-H)

Square Peg Communications Inc.’s second-generation Physical Layer Tester (PLT-H) is a generic PC based test tool which supports the testing and type approval of mobile terminals and base stations for various satellite or wireless communications networks.

The generic PLT-H hardware platform runs software specific to the equipment type under test. The following applications are currently available:

Product

Inmarsat Standards

Inmarsat BGAN Physical Layer Tester (BPLT)

BGAN, FleetBroadband, SwiftBroadband, SB-SAT

Inmarsat-C Physical Layer Tester (CPLT)

Inmarsat-C

Inmarsat Aeronautical Ground Data Unit (GDU)

Classic Aero

Inmarsat Packet Data Service MES Physical Layer Tester (IPLT)

GAN Mobile Packet Data Service (MPDS)

Inmarsat Mini-M / M4 Physical Layer Tester (MPLT)

mini-M, GAN Mobile ISDN, Fleet 33/55/77, Swift 64

  • The PLT comprises the following components:

    Channel Unit

    The PC-based Channel Unit implements the communication channels at IF.  Up to four transmit and four receive channels are supported.  It communicates with an optional Protocol Tester over a LAN or serial connection.  The CU includes a high stability 10 MHz frequency reference and provides a Windows based Operator Interface.

    IF Unit

    The optional IF Unit combines the CU transmit channels, and applies the combined signal to three Tx feeds for LES testing.  It combines the signals from four Rx feeds and applies the combined signal to the CU receive channels.  External noise sources or other signals can be added independently to the composite Tx and Rx signals.

    RF Unit

    The optional RF Unit converts the CU IF feeds to and from L-band, at the appropriate levels for connection to an MES antenna port.  L-band noise can be added to the MES L-band feed.

  • Physical


    Channel Unit (CU)

    19” / 6U rack mount industrial PC

    IF Unit (IFU)

    19” / 3U rack mount enclosure

    RF Unit (RFU)

    19” / 3U rack mount enclosure

    RF


    Connector

    N female

    Impedance

    50 W nominal

    Receive frequency

    1626.5 to 1675.0 MHz

    Receive frequency step size

    1 Hz

    Receive level (into high-power attenuator)

    0 to +48 dBm (+45 dBm max per channel)

    Receive level (into RFU)

    -30 to +18 dBm

    Receiver spurious signals

    ≤55 dBc

    Receiver phase noise density

    @ 100 Hz:   ≤70 dBc/Hz
    @ 1 kHz:     ≤80 dBc/Hz
    @ 10 kHz:   ≤90 dBc/Hz
    @ 100 kHz: ≤100 dBc/Hz

    Receiver 3rd order intermodulation

    ≤55 dBc (two carriers at 3 dB below maximum, receive path attenuation adjusted optimally)

    Receiver I/Q amplitude and phase  imbalance

    Negligible

    Transmit frequency

    1518.0 to 1559.0 MHz

    Transmit frequency step size

    1 Hz

    Transmit level (from high-power attenuator)

    -60 dBm max per-carrier (internally generated carriers)
    -15 dBm max (externally applied noise)

    Transmit level (from RFU)

    -30 dBm max per-carrier (internally generated carriers)
    +15 dBm max (externally applied noise)

    Transmit level resolution

    0.01 dB

    Transmit level accuracy

    ± 1.0 dB

    Transmit phase noise density

    @ 100 Hz:   ≤70 dBc/Hz
    @ 1 kHz:     ≤80 dBc/Hz
    @ 10 kHz:   ≤84 dBc/Hz
    @ 100 kHz: ≤95 dBc/Hz

    Transmit spurious

    < -55 dBc

    Transmit 3rd order intermodulation

    ≤55 dBc with two carriers at 3 dB below maximum

    Transmit frequency accuracy

    ± 1 ´ 10-7

    Transmit I/Q amplitude and phase imbalance

    Negligible

    IF Transmit

    Connector

    BNC female

    Impedance

    50W

    Frequency

    41.5 – 90.0 MHz

    Level

    -20 dBm to -40 dBm per channel

    IF Receive

    Connector

    BNC female

    Impedance

    50W

    Frequency

    41.5 – 90.0 MHz

    Level

    -20 dBm to -40 dBm per channel

    Reference


    Source

    Internal / External

    Connector

    BNC female

    Impedance

    50W

    Frequency

    10 MHz

    Level

    +7 dBm ± 1 dB

    Aux. reference out level

    -1 dBm ± 2 dB

    Frequency error

    ≤10-7

    Power

    Connector

    IEC 320 male

    Voltage

    105-130 VAC or 205-250 VAC, 47-63 Hz

    Current (PLT-H Channel Unit with 4 channels)

    ≤2.54 A rms at 115 VAC

    Current (PLT IF Unit)

    ≤0.06 A rms at 115 VAC

    Current (PLT RF Unit)

    ≤0.12 A rms at 115 VAC

  • PLTH Data Sheet

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