SpectraLink Link 3000 Service manual

Technical Bulletin CS-05-03
Minimizing Interference with Wireless Medical Systems in
Healthcare Environments
Date: March 28, 2005
Software Versions: All
Hardware Revisions: All
Product Type: All Link Systems
Access Level: General
Originator: Lisa Kvasnicka
Approvers: Wayne McAllister
Gary Bliss
Status: Approved
Revision: A
Description
As wireless systems in healthcare environments become more prevalent for patient
monitoring and telemetry, SpectraLink has taken steps to minimize potential
interference between other vendors’ products and SpectraLink’s Link Wireless
Telephone System. This update describes a proactive approach that healthcare
customers can take to minimize interference with wireless medical systems entering the
market.
Problem
Some of the wireless systems in use in healthcare environments utilize portions of the
same 902-928 MHz bandwidth as the Link Wireless Telephone System. When the Link
WTS and a wireless medical system are located in the same area, there is the
possibility of interference between the two systems. SpectraLink has a tested solution
that allows such systems to operate normally in the healthcare environment.
Resolution
Link WTS units shipped from the factory are preset to operate on frequency range
Sequence #1 which spans the entire spectrum from 902 MHz to 928 MHz. Testing has
shown that selecting the SpectraLink system to operate on Frequency Hopping option
#3 (902-909 and 921-928) will minimize the interference effects from the Link WTS
base stations and handsets to other vendors’ equipment configured to operate in the
910-920 MHz portion of the band. The table below lists the frequencies used by each
sequence option for the Link WTS.
Sequence Frequencies Used by Link WTS (in MHz)
Sequence Frequencies Utilized
1 902 - 928
2 902 - 915
3 902 - 909 & 921 - 928
4 914 - 928
5 902 - 904 & 909 - 921
6 904 - 910 & 920 - 928
7 908 - 922
THE INFORMATION PROVIDED IN THE SPECTRALINK TECHNICAL BULLETIN IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. NO
OBLIGATION OR LIABILITY WILL ARISE OUT OF, SPECTRALINK RENDERING TECHNICAL OR OTHER ADVICE OR SERVICE IN CONNECTION
HEREWITH.
SpectraLink Corporation • 5755 Central Avenue • Boulder, Colorado 80301 • 303.440.5330 • Fax [phone]

Technical Bulletin CS-05-03
Link 150 Model 3 System
For the Link 150 M3 system, the preferred method of selecting an alternate spread
spectrum sequence is to dial into the internal modem of the first MCU. Contact
SpectraLink to arrange for a technician to dial into the system and change the
frequency. If modem access is unavailable, instructions on how to manually change the
frequency range can be found in Section 11.1, “Select Alternate Spread Spectrum
Sequence” of the Installation and Operation Link WTS – Link 150 M3 MCU manual, part
number 72-0075-01, which can be found on
http://www.spectralink.com/service/manuals_link.html.
Link 3000 System
For the Link 3000 MCU system, the spread spectrum sequence is changed through a
direct connection to the system or by dialing into the system through an external
modem. This can be done by the administrator of the system or remotely by a
SpectraLink technical support engineer. Instructions on how to change the frequency
range can be found in Section 3.2, “Configure MCU (F8-Configuration Display and
Administration)” of the Operator’s Console Link WTS – Link 3000 MCU manual, part
number 72-0059-02, which can be found on
http://www.spectralink.com/service/manuals_link.html. Additional instructions on how to
configure systems with more than 25 or 50 base stations when the spectrum is half-
hopping can be found in Section 3.1 under “Configure Base Stations (RCUs).”
NOTE: If the Link WTS system is currently set to a sequence other than Sequence #1,
evaluation is recommended before any changes to the sequence are made. The
reason for using that specific sequence must be determined since the current setting
may be an indication that interference was experienced in the facility during initial
installation.
Additional Information
Selecting a new spread spectrum sequence is a short, straightforward procedure that
can be done from the operator console or through remote login and does not require
any change to the handsets. Contact your SpectraLink representative for more details.
THE INFORMATION PROVIDED IN THE SPECTRALINK TECHNICAL BULLETIN IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. NO
OBLIGATION OR LIABILITY WILL ARISE OUT OF, SPECTRALINK RENDERING TECHNICAL OR OTHER ADVICE OR SERVICE IN CONNECTION
HEREWITH.
SpectraLink Corporation • 5755 Central Avenue • Boulder, Colorado 80301 • 303.440.5330 • Fax [phone]