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Form Factor
M.2
External Voltage
Yes
Interface to host
micro USB port
Operating Temperature Range
-25 °C – 70 °C
Module KEY
B

Installation and assembly guide for USBM2 and USB3M2 adapter board products (with casing)

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Uploaded at
2017-11-08 16:56:51
Last updated
2017-11-10 16:59:31
Version
1
Related products
M.2 to USB adapter with casing and external power
M.2 to USB adapter with external voltage
USB3.0 M.2 Adapter with enclosure
Question

The Sierra Wireless EM73, EM74 and EM75 series M.2 modules are not detected in the host system when used with the M.2 to USB adapter board? (USBM2, USB3M2)

Solution

For Sierra Wireless EM73, EM74 and EM75 series M.2 modules you will have to change the state of the jumper JP1 on the USB adapter board. This controls the Dynamic Power Control (DPR) pin in M.2 socket to the cellular module.

Please remove the pin jumper piece and leave all 3 pins not connected / floating. This will allow the module to operate normally.

After changing this jumper state and powering on the module and adapter board, you should see the module appear and boot up normally in the host system device.

For further details, please relate to the Sierra Wireless related product technical specification as well as the assembly guide for the adapter boards.

Question

Why should we use USB3 instead of USB2 as host system data interface if the cellular module can support both?

Solution

Cellular modules supporting higher data throughput rates like LTE Advanced, category 6 and above (300Mbps downlink and 50Mbps uplink) often support both USB3 interface as well as USB2 interface towards the host system.

It is recommended to implement and use the USB3 data interface rather than the older USB2 interface on these modules between host system and the cellular module. This because USB3 can support around 10 times higher data throughput rate compared to USB2 and avoid a possible bottleneck / limitation in the data interface between host and cellular module.

If a miniPCIe based cellular module implementing USB3 are used, please verify that conflicts don't occur towards your hosts miniPCIe socket, as the USB3 interface is not implemented by default in the miniPCIe standard and therefore signal collisions can happen between USB3 pins and PCIe data interface pins situated on same locations. Refer to the cellular module hardware guides and host system hardware guides to verify this.

Question

The Sierra Wireless EM73, EM74 and EM75 series M.2 modules are not detected in the host system when used with the M.2 to USB adapter board? (USBM2, USB3M2)

Solution

For Sierra Wireless EM73, EM74 and EM75 series M.2 modules you will have to change the state of the jumper JP1 on the USB adapter board. This controls the Dynamic Power Control (DPR) pin in M.2 socket to the cellular module.

Please remove the pin jumper piece and leave all 3 pins not connected / floating. This will allow the module to operate normally.

After changing this jumper state and powering on the module and adapter board, you should see the module appear and boot up normally in the host system device.

For further details, please relate to the Sierra Wireless related product technical specification as well as the assembly guide for the adapter boards.

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