TM80 Telemetry Monitor Service Manual 3-9
3.2.1 Requirements for Network Feasibility
Before installing TM80 telemetry monitors, it is very important to confirm network
feasibility.
Wireless coverage, WLAN features and AP capability and compatibility are decided
by infrastructure of network, infrastructure of network can’t be modified easily. If the
network does not meet the requirements before TM80 is installed, network
dropping-off may happen easily after installation.
3.2.1.1 Requirements for the Wireless Coverage
The wireless coverage must be well controlled to ensure that TM80 can achieve the
maximum data-rate and the lowest packet loss ratio. TM80 data is real-time
upstream data streams and is similar to VoIP data. Monitoring data carries real-time
physiologic information about patients. Therefore, reasonable wireless coverage
must be provided for monitors. In particular, because the telemetry device TM80 is
worn on human body, the signal may become poorer due to blocking of human
body.
The requirements of the TM80 for wireless coverage are as follows:
No. Item Requirements of the TM80 Description
1 Received
signal
strengths
(RSSI)
≥-65 dBm
Signal coverage requirement for APs
connected to the TM80: RSSI value
displayed on the TM80
The requirement
must be met.
2 Co-channel
interference*
≤-20dB
Measured on the same channel of
the TM80
The requirement
must be met.
3 Ping delay The mean delay of PC or cell phone
with normal wifi module is smaller
than 100ms and the packet lost rate
shall be less than 1%.
The requirement
must be met.
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