Ublox TOBY-R2 Series System Integration Manual

Also see for TOBY-R2 Series: User guide

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Ublox TOBY-R2 Series System Integration Manual Manual pdf 54 page image

TOBY-R2 series - System integration manualUBX-16010572 - R10 System description Page 54 of 1511.14 System features1.14.1 Network indicationGPIOs can be configured by the AT command to indicate network status (for further details seesection 1.12 and the u-blox AT commands manual [2], GPIO commands): 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)1.14.2 Antenna supervisorThe antenna detection function provided by the ANT_DET pin is based on an ADC measurement asoptional feature that can be implemented if the application requires it. The antenna supervisor isforced by the +UANTR AT command (see the u-blox AT commands manual [2] 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 boardSee section 1.7.2 for detailed antenna detection interface functional description and see section 2.4.2for detection circuit on application board and diagnostic circuit on antenna assembly design-inguidelines.1.14.3 Jamming detection☞ Congestion detection (i.e. jamming detection) is not supported by “02” / "42" / "82" productversions.In real network situations modules can experience various kind of out-of-coverage conditions: limitedservice conditions when roaming to networks not supporting the specific SIM, limited service in cellswhich are not suitable or barred due to operators’ choices, no cell condition when moving to poorlyserved or highly interfered areas. In the latter case, interference can be artificially injected in theenvironment by a noise generator covering a given spectrum, thus obscuring the operator’s carriersentitled to give access to the LTE/3G/2G service.The congestion (i.e. jamming) detection feature can be enabled and configured by the +UCD ATcommand: the feature consists of detecting an anomalous source of interference and signaling thestart 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. configuringthe module in “airplane mode” by means of the +CFUN AT command) in order to reduce powerconsumption and monitoring the environment at constant periods (for more details see the u-blox ATcommands manual [2], +UCD AT command).1.14.4 Dual stack IPv4/IPv6TOBY-R2 series support both Internet Protocol version 4 and Internet Protocol version 6 in parallel.For more details about dual stack IPv4/IPv6 see the u-blox AT commands manual [2].