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MP6025871-12C1 / A
Radio Frequency (RF)
communications
Transmitter expected
service life
Guardian 2 Link wireless communication
Quality of service
The Guardian 2 Link transmitter and the MiniMed 640G insulin pump are associated
as part of an 802.15.4 network for which the pump functions as the coordinator and
the transmitter as an end node. In an adverse RF environment the pump will assess
channel changing needs based on "noise" levels detected during an energy scan.
The pump will perform the energy scan if after 10 minutes no CGM transmitter signal
has been received. If the channel change occurs the pump will send beacons on the
new channel.
The Guardian 2 Link transmitter will initiate a channel search when beacon detection
fails on the associated channel. The search will be conducted across all five
channels. When the beacon is located the transmitter will rejoin on the identified
channel. Upon re-association any missed packets (up to 10 hours) will be transmitted
from the transmitter to the pump.
In normal operation the transmitter will transmit a packet every 5 minutes and
retransmit the packet if the data is corrupted or missed.
Data security
The MiniMed 640G insulin pump is designed to only accept radio frequency (RF)
communications from recognized and linked devices (you must program your pump
to accept information from a specific device).
The MiniMed 640G insulin pump and system components (meters and transmitters)
ensure data security via proprietary means and ensures data integrity using error
checking processes, such as cyclic redundancy checks.
Pump to transmitter frequency: 2.4 Ghz; proprietary Medtronic protocol;
range up to 1.8 meters (6 feet)
Utilizes the IEEE 802.15.4 protocol with proprietary data format
Operating frequency: 5 frequencies are used: 2420, 2435, 2450, 2465, and
2480 MHz
Bandwidth: 5 MHz, which is allocated channel bandwidth per IEEE protocol
The transmitter expected service life is 1 year depending on patient usage
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