User Manual

TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R08 Early Production Information System description
Page 58 of 158
1.15 System features
1.15.1 Network indication
Network status indication over GPIO1 is not available on MPCI-L2 series modules which include the
LED_WWAN# active-low open drain output to provide the Wireless Wide Area Network status indication
as specified by the PCI Express Mini Card Electromechanical Specification [15].
GPIOs are not supported by TOBY-L2 modules “00”, “01”, “50” product versions, but the Wireless Wide
Area Network status indication is by default configured on the GPIO1 of “00”, “01” product version.
The GPIO1 can be configured by the AT+UGPIOC command (for further details see the u-blox AT Commands
Manual [3]), 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
Antenna supervisor (i.e. antenna detection) is not available on MPCI-L2 series.
Antenna supervisor (i.e. antenna detection) is not supported by TOBY-L2 series modules “00”, “01” and
“50” 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 [3] 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 1.7.2 for detailed antenna detection interface functional description and see section 2.4.2 for
detection circuit on application board and diagnostic circuit on antenna assembly design-in guidelines.
1.15.3 Jamming detection
Congestion detection (i.e. jamming detection) is not supported by “00”, “01” and “50” 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 [3]).