SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R08
Objective Specification
System description
Page 78 of 188
1.13.15
In-Band modem (eCall / ERA-GLONASS)
Not supported by SARA-G300 / SARA-G310 / SARA-U260 / SARA-U280 modules.
SARA-G340, SARA-G350 and SARA-U2 modules support an In-Band modem solution for the European eCall
and the Russian ERA-GLONASS emergency call applications over cellular networks, implemented according to
BS EN 16062:2011
[30] and
ETSI TS 122 101
[31] specifications.
eCall (European) and ERA-GLONASS (Russian) are initiatives to combine mobile communications and satellite
positioning to provide rapid assistance to motorists in the event of a collision. The eCall automated emergency
response system is based on GPS, and the ERA-GLONASS is based on the GLONASS positioning system.
When activated, the in-vehicle systems (IVS) automatically initiate an emergency call carrying both voice and data
(including location data) directly to the nearest Public Safety Answering Point (PSAP) to determine whether
rescue services should be dispatched to the known position.
Figure 32: eCall and ERA-GLONASS automated emergency response systems diagram flow
For more details regarding the In-Band modem solution for the European eCall and the Russian ERA-GLONASS
emergency call applications see the
u-blox eCall / ERA-GLONASS Application Note
1.13.16
SIM Access Profile (SAP)
Not supported by SARA-G3 modules.
SIM access profile (SAP) feature allows SARA-U2 modules to access and use a remote (U)SIM card instead of the
local SIM card directly connected to the module (U)SIM interface.
SARA-U2 modules provide a dedicated USB SAP channel and dedicated multiplexer SAP channel over UART for
communication with the remote (U)SIM card.
The communication between SARA-U2 modules and the remote SIM is conformed to client-server paradigm: the
SARA-U2 module is the SAP client establishing a connection and performing data exchange to an SAP server
directly connected to the remote SIM that is used by SARA-U2 module for GSM/UMTS network operations. The
SAP communication protocol is based on the
SIM Access Profile Interoperability Specification
SARA-U2 modules do not support SAP server role: the module acts as SAP client only.
A typical application using the SAP feature is the scenario where a device such as an embedded car-phone with
an integrated SARA-U2 module uses a remote SIM included in an external user device (e.g. a simple SIM card
reader or a portable phone), which is brought into the car. The car-phone accesses the GSM/UMTS network
using the remote SIM in the external device.
