Introducing sysmoQMOD

(Download the Data Sheet)


The sysmoQMOD is a quad mPCIE modem carrier board with integrated management and remote SIM forwarding capabilities. Targeted users are system integrators who use the sysmoQMOD to build their own products, such as remote nodes for cellular network quality monitoring or roaming testing. Multiple cellular modems connected to a single USB port / USB host can be used in a variety of applications, such as

  • least-cost routing of voice, SMS or data services to different cellular networks of different operators
  • load-balancing of data traffic across multiple cellular connections
  • remotely deployed systems for automatic remote roaming probes, providing roaming testing services to operators – particularly in combination with the remote SIM functionality.
  • remotely deployed systems for service / QoS testing of cellular networks
  • test equipment for interoperability, load and functional testing of cellular infrastructure equipment.

The edge loaded SIM slots and the LEDs with light-guide option allow the PCB to mount in very flat cases with front operation and even to stack multiple PCB to very dense solutions with more than only 4 modems. All connectors are daisy chained for easy assembly of solutions with multiple PCB. This is also reflected in the options to mount different power supply and USB connectors.

Monitoring and control of the modems is realized via two USB-attached onbard microcontrollers. They allow to reset the modems, monitor the WWAN LED and also to reset the USB hub. Power cycling of all modems is realized via standard USB hub power control. Above features allows the continuous unattended operation of the sysmoQMOD in remote sites with no physical access. sysmoQMOD will be delivered without WWAN modules by default. Suitable mPCIE modules for 2G/3G/4G are available from brands like u-blox, Huawei, Sierra Wireless, Quectel, ZTE, SIMcom or Gemalto. Upon request, we can supply your preferred modem model. In addition to the USB connection, the sysmoQMOD exposes the PCM audio interface of selected modems on connectors, enabling system integration with external digital voice components. JTAG and serial connectors for the SAM3 microcontroller are provided for development and debugging firmware and applications. The sysmoQMOD allows also in field reprogramming of it's firmware and USB parameters. The complete firmware and host software components are Free / Open Source Software (FOSS) and can be found at git://

Functional description

Each modem appears as an USB device to the host in the same manner as in standard PC boards and laptops. This allows the use of existing code for regular operation. Control and monitor options of the micro controllers is achieved via the simtrace2 tool, general power cycling of the modems is possible via the USB hub control functionality.

Remote SIM operation / SIM switching

One of the outstanding features of the sysmoQMOD is the operation of the modems with remote SIMs. This allows the alternating use of multiple SIMs with one modem by switching between those SIMs via software. Selecting on-board SIM or one ore multiple remote SIMs is possible by means of the microcontrooler. Remote SIMs are inserted in an off the shelf SIM card reader or a specialized large SIM bank. The remote SIM functionality is possible via Internet connection, making it easy to test new SIM cards for roaming capabilities. As the number of remote SIMs is not limited, the remote SIM functionality works also perfect for automated SIM cycling and subsequent testing of e.g. service availability in dedicated local networks.

Remote SIM

Technical Data

Mechanical / Electrical specification

Dimensions of PCB 160 x 120 mm, Stacking height: min. 17 mm
Mounting M3 Mounting Holes for spacers/stands
miniPCIe slots 4, for cellular / WWAN Modems
SIM/UICC slots 4, ETSI/3GPP 2FF form factory, edge-launch sim slots
USB host port USB-A or 2.54mm pin header (factory option)
USB device port USB-B or 2.54mm pin header (factory option)
PCM/AUX port per modem, depends on modem implementation
Debug facilities microprocessor serial port, JTAG
Microprocessors 2 x Atmel SAM3
LED 4 x WWAN LED, 4 x programmable LED, light guide mounts
Input Voltage 6-14 V DC (typ 12V DC), 5A max.

Software / Logical specification

Standard modem Access USB
External modem control capabilities Remote SIM simtrace2 tool ( git://, GPLv2
USB and power management control uhubctl (, GPLv2
Modem power cycle all modems at the same time via power management
Modem reset per modem via simtrace2

Block Diagram

Block Diagram