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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
12. Technical Parameters
12.1 Select Alternate Spread Spectrum Sequence
The Link WTS uses spread spectrum radio transmission. Spread spectrum takes a
discrete signal, such as a digitized voice conversation, and spreads it over a wide
range of frequencies rather than transmitting at a single carrier frequency. The
frequency range may need to be adjusted if other wireless devices in your facility,
such as data terminals or bar code readers, share the same frequency band.
Units shipped from the factory are preset to operate on sequence 1, which spans the
entire spectrum from 902MHz to 928MHz. If interference between the Link WTS
and other 900MHz radio devices is anticipated or observed, any one of six alternate
sequences can be selected.
Determine the frequency band of the interfering device, then use the frequency
ranges below (given in MHz) to select the best interference avoidance pattern for the
situation.
Sequence Frequencies Used by SpectraLink
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
To change a system to an alternate sequence, perform the following steps for each
MCU.
1. Wait for any calls in progress to end. Power the system off, then slide the mode
switch to the
REGISTER position.
2. Power the system on. STATUS LEDs 5 and 1 should be lit, indicating frequency
selection mode. One of the LINE LEDs from 1 to 7 will be indicating the current
frequency selected for the MCU.
3. Use the STEP button to select the desired new sequence.
4. Press the DEL/ENTER button. The LED indicates the new frequency that has been
selected.
5. Return the mode switch to the NORMAL position.
6. Repeat steps 1 through 5 for each MCU of a multi-unit installation.
PN: 72-0075-01-F.doc Page 44