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vGSM-II card



The vGSM-II card is a PCI adapter to make GSM network services available to the hosting system. It may be used in several applications: voice, data and SMS gateways, SMS interactive systems, remote control, etc...

The vGSM-II is a complete redesign of the vGSM card with improved functionalities and performance, in particular it supports full digital audio handling, SIM routing and remotization, an additional physical serial port for each module, several signalling LEDs and much more.



  • PCI v2.2, 5V and 3.3V signaling
  • Dimensions  : 154mm x 107mm (PCB) , 164mm x 129mm including SIM holder, bracket and connectors.
  • FPGA based for greater flexibility. Firmware may be field-reprogrammed.
  • Firmware reprogramming may be disabled with a jumper for further security
  • Little-endian and Big-endian modes directly implemented in hardware

GSM Modules

  • Two or four MC55 or MC56 Siemens GSM modules
  • GSM900/PCS1800/PCS1900 bands for MC55
  • GSM850/PCS1800/PCS1900 bands for MC56
  • Phase 2/2+ compliant
  • Output power: Class 4 (2 watt) in EGSM900/EGSM850, Class 1 (1 watt) in PCS1800/PCS1900
  • Antenna connectors: 4, female SMA 50 Ω

UART Interfaces

  • Up to 230 kbaud serials for fast communication with the modules
  • Deep FIFOs for serials
  • Two independent serial ports to each GSM module, two applications may use the same module at the same time.

SIM Interfaces


  • Full digital 16-bit linear audio paths
  • Independent sampling clock on each path
  • 2048 bytes RX and TX FIFOs for improved jitter tolerance
  • Interrupt-less audio handling
  • Hardware A-law and μ-law companders/decompanders available on each FIFO


  • 26 LEDs for extensive monitoring of modules and card's state
  • LEDs routable to hardware signals or software controllable
  • LED security (data cannot be easily extracted from the LED light output)


  • Operating temperature: -20 °C to +45 °C
  • Storage temperature: -40 °C to +85 °C

Software support

  • Low-level drivers and infrastructure for Linux 2.6.x
  • Support for Asterisk 1.2.x and 1.4.x
  • More informations at software framework page
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