TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R28
System description
Page 59 of 164
1.15
System features
1.15.1
Network indication
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MPCI-L2 series modules include the LED_WWAN# active-low open drain output to provide the
Wireless Wide Area Network status indication as per PCI Express Mini Card Electromechanical
Specification
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GPIOs are not supported by TOBY-L2 modules “00”, “01”, “60” product versions, but the Wireless
Wide Area Network status indication is by default configured on the GPIO1 pin.
The GPIO1 can be configured by the AT+UGPIOC command (for further details see the u-blox AT
Commands Manual
), to indicate network status as described below:
No service (no network coverage or not registered)
Registered 2G / 3G / LTE home network
Registered 2G / 3G / LTE visitor network (roaming)
Call enabled (RF data transmission / reception)
1.15.2
Antenna supervisor
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Antenna supervisor (i.e. antenna detection) is not available on MPCI-L2 series.
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Antenna supervisor (i.e. antenna detection) is not supported by TOBY-L2 series modules “00”, “01”
and “60” product versions.
The antenna detection function provided by the ANT_DET pin is based on an ADC measurement as
optional feature that can be implemented if the application requires it. The antenna supervisor is
forced by the +UANTR AT command (see the u-blox AT Commands Manual
for more details).
The requirements to achieve antenna detection functionality are the following:
an RF antenna assembly with a built-in resistor (diagnostic circuit) must be used
an antenna detection circuit must be implemented on the application board
See section
for detailed antenna detection interface functional description, and see section
for detection circuit on application board and diagnostic circuit on antenna assembly design-in.
1.15.3
Jamming detection
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Congestion detection (i.e. jamming detection) is not supported by “00”, “01”, “02” “03”, “60” and
“62” product versions.
In real network situations modules can experience various kind of out-of-coverage conditions: limited
service conditions when roaming to networks not supporting the specific SIM, limited service in cells
which are not suitable or barred due to operators’ choices, no cell condition when moving to poorly
served or highly interfered areas. In the latter case, interference can be artificially injected in the
environment by a noise generator covering a given spectrum, thus obscuring the operator’s carriers
entitled to give access to the LTE/3G/2G service.
The congestion (i.e. jamming) detection feature can be enabled and configured by the +UCD AT
command: the feature consists of detecting an anomalous source of interference and signaling the
start and stop of such conditions to the host application processor with an unsolicited indication,
which can react appropriately by e.g. switching off the radio transceiver of the module (i.e. configuring
the module in “airplane mode” by means of the +CFUN AT command) in order to reduce power
consumption and monitoring the environment at constant periods (for more details see the u-blox AT
Commands Manual
