User's Guide

Table Of Contents
161
The Bigfoot Unity
Diabetes Management System User Guide | Appendix C
C.9 Meter Specifications
See the instructions that came with your Meter and the inserts that
came with your test strips and control solution for specications for
those devices.
C.7 Security Measures
The communication between the White Cap and Sensor during a
scan is a short range Near Field Communication (NFC) method which
makes it difcult to interfere with or intercept during transmission.
The transmitted data is protected by a proprietary data format,
encryption, and memory map. The integrity of transmitted data is
ensured by a cyclic redundancy check (CRC) generated by the Sensor
and veried by the White Cap. The communication between the App
and Sensor for Alert data is a standard Bluetooth
®
Low Energy (BLE)
connection. The pairing of the Sensor to the App is accomplished
during activation with an authenticated login procedure that uses an
Out-of-band key exchange (NFC). This prevents unauthorized devices
from connecting to the Sensor. The transmitted data is protected by
a proprietary data format and encryption. This prevents unauthorized
devices from accessing the data if they are within range and intercept
the transmission. Under normal operation, the industry standard BLE
protocols allow for many users to be in the same vicinity. In the case
where the connection is lost due to out-of-range or interference,
reconnection is only possible with the authenticated App that activated
the Sensor.
C.8 Quality of Service (QoS)
QoS for the White Cap and Sensor wireless communications using
NFC is assured within the effective range of 1.0 cm between the
Sensor and Cap that is specied to occur within 15 seconds. QoS for
the wireless communication using BLE is assured between the App
and Sensor at regular 1-minute intervals. If connection is lost between
the App and Sensor for ve minutes, “Sensor Unavailable - Glucose
alerts temporarily unavailable” displays on the App Home screen. If
connection is lost for 20 minutes, the App also alerts the user if the alert
is turned on. If connection is lost between the Sensor and the App, up
to 8 hours of glucose results can be retrieved by performing a scan with
the White Cap. The App and Cap are designed to only accept radio
frequency (RF) communications from recognized and paired Sensors.