PX4 - Mobile Phone Voice Interface

For In-System Mobile Phone Functionality

The PX4 is a Full-Mini PCI Express Mini Card providing an interface for mobile wireless functions including audio. It is built in a stacked structure, consisting of one PCI Express Mini Card to connect on a carrier board and one mezzanine card for another plug-on PCI Express Mini Card.

Supports Mini-SIM and LTE

The PX4 provides a mini-SIM card slot. If a mini-SIM card is mounted and, e.g., a 4G LTE modem for mobile phone functionality is assembled as plug-on PCI Express Mini Card, the PX4 extends the wireless data communication with audio. This allows, e.g., the train driver to make phone calls via mobile wireless cards.

Usable in Harsh Environments

The wide temperature range of -40°C to +85°C and the availability of a product model with conformal coating makes the PX4 especially suited for use in the rail and public transport market.


  • USB audio streaming controller for mobile wireless cards
  • Perfect extension for PCI Express Mini Cards with mobile phone functionality, e.g., 4G LTE modem
  • PCI Express Mini Card form factor
  • Mini-SIM card socket integrated
  • -40°C to +85°C
  • Conformal coating (optional)


Wireless Functionality
Possible wireless functions:
  • LTE
Onboard Interfaces
  • PCI Express Mini Card Slot
    • One PCI Express Mini Card slot
    • Full-Mini; PCIe, USB 2.0
    • I2S audio interface
  • PCI Express Mini Card Interface
    • One PCI Express Mini Card interface
    • PCIe, USB 2.0
  • SIM Card
    • One mini-SIM card slot
Electrical Specifications
  • Supply voltage
    • +1.5 V and +3.3 V
  • Power consumption
    • 0.33 W max.
Mechanical Specifications
  • Dimensions
    • PCI Express Full-Mini Card
    • Height: 12 mm (with PCI Express Mini Card assembled)
  • Weight: 10 g (model 15PX04-00)
Environmental Specifications
  • Temperature range (operation): -40°C to +85°C
  • Temperature range (storage): -40°C to +85°C
  • Cooling concept
    • Air-cooled, airflow 1.0 m/s min.
  • Relative humidity (operation): max. 95% non-condensing
  • Relative humidity (storage): max. 95% non-condensing
  • Altitude: -300 m to +3000 m
  • Shock: 15 g, 11 ms
  • Bump: 10 g, 16 ms
  • Vibration (sinusoidal): 1 g, 10..150 Hz
MTBF: 500 000 h @ 40°C according to IEC/TR 62380 (RDF 2000)
Flammability (PCBs)
  • UL 94 V-0
  • EN 50121-3-2 (table 4) (EMC in rolling stock)
  • EN 55011 (radio disturbance)
  • EN 61000-4-2/EN 50121-3-2 (table 9) (ESD)
  • EN 61000-4-3/EN 50121-3-2 (table 9) (electromagnetic field immunity)
  • EN 61000-4-4/EN 50121-3-2 (table 8) (burst)
  • EN 61000-4-6/EN 50121-3-2 (table 7) (immunity to conducted disturbances)
Software Support
  • Linux
  • Windows