Wireless Network Systems
Bedside monitors with a wireless network connection have their advantages, however the
flexibility the wireless link offers is not without its challenges. The reliability and quality of
the wireless signal transmission through the air and hospital walls are governed by a number
of variables that can be difficult to control. A wireless network connection from a bedside
cannot be as dependable as a wired network connection.
The effect of low signal strength and interference on the display of the patient information
from a wireless bedside at the central station can range from a momentary period to a lengthy
period of data loss. Although data loss due to the wireless link may be occurring at the central
station, monitoring and alarms continue at the bedside.
Frequency management is the selection of the frequencies for wireless devices within a
facility to prevent interference between devices. Frequency management is the responsibility
of the hospital. Philips Medical Systems has no control over the RF environment in the
hospital. If interference exists at the operating frequencies, the wireless system will be
The Philips wireless network operates in the 2.4-2.485 GHz range. Other devices that might
be found in the hospital that can radiate in the 2.4-2.485 GHz range and create interference
A quick check for interference while doing a site survey can be done using a "Snoop" tool
(see RF Survey on page 3-27). However, there is no guarantee that all the devices are
operating at that time. With the recent explosion in the use of wireless devices, there is no
substitute for a central authority in the hospital that tracks and licenses (if required by local
regulations) all wireless devices used within the facility.
Wireless monitoring has many advantages, but it also has some challenges. The reliability and
quality of the wireless signal transmission through the air and hospital walls are governed by a
number of variables that can be difficult to control. A wireless network connection from a
bedside cannot be as dependable as a wired network connection.
Failure to adhere to the rules and guidelines provided in this section will result in an
increase in the number of dropouts the users see at the Information Center. You can
avoid dropouts by avoiding things that cause the corruption of wireless data.
other wireless networks
some wireless telephone headsets
devices utilizing BlueTooth technology
some programming devices for pacemakers
Wireless Network Systems