SpectraLink 150 M3 MCU - Manual (Page 51)

SpectraLink Corporation Link WTS Installation and Operation
Part Number: 72-0075-01-C-W.doc Page 40
11. Appendix A: Technical Parameters
11.1 Select Alternate Spread Spectrum Sequence
The SpectraLink system 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 SpectraLink system 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 NORM position.
6. Repeat Steps 1-5 for each MCU of a multi- unit installation.