Philips Avalon CTS M2720A, Service Manual

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Setting Expectations 1 General Information
13
Multi-Region Base Station
For countries requiring the Multi-Region base station (for example, Norway and Singapore), the receiver in
the base station is “disabled” before it leaves the factory. The correct approved frequency range is then
enabled locally during installation using the Service Support Tool. (See also “Multi-Region Base Station”
on page 66.)
Frequency Planning
For Japan and countries using the Multi-Region base station, and for multiple cordless/telemetry
installations in the same hospital, an RF frequency plan should be implemented. Document all frequencies
or frequency ranges occupied by:
• Other telemetry systems (adult and fetal).
• Multiple Avalon CTS systems (operating on fixed frequencies). Remember that the Avalon CTS is also a
potential interference source for other RF systems.
• Other sources of RF interference (other electrical equipment, broadcasting stations, or paging systems,
for instance).
Once you have identified all the occupied frequencies or frequency ranges (for example, by using the
Service Support Tool software) you can change the system’s configuration by following the guidelines for
RF channel/frequency configuration.
• Exclude frequency ranges already occupied by other telemetry systems or that are subject to interference
from other RF sources (see page 65).
• Use fixed frequencies for the base station, possibly in conjunction with altering the channel spacing (see
page 74).
• Use fixed frequencies for the transducers (see page 66).
Setting Expectations
No matter how good a telemetry system design is, it will always experience occasional loss of radio
communications, resulting in US/Toco/ECG dropouts. A telemetry system will never be as reliable as a
hard-wired monitor that transmits its signal through a wire. If occasional loss of US/Toco/ECG
monitoring is not acceptable for certain patients, they should be connected to a hard-wired bedside
monitor.
WARNING
Telemetry should not be used for primary monitoring in applications where the momentary loss of the US/
Toco/ECG signal is unacceptable.
Following are guidelines to set proper expectations of hospital staff and to improve system performance:
• Clinicians will tend to see more motion related artifact on the US/Toco/ECG measurements of
ambulatory patients than on patients that are restricted to a bed.
• Patients should be restricted to the designated coverage area. Monitoring performance will degrade if
patients go outside the radius of coverage of the receiving antenna.
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