SpectraLink
Link 150 Installation and Operation
12/28/98
35
A. Technical Parameters
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. Remove power from the MCU, then slide
the mode switch to the
REGISTER
position.
2.
Apply power. The seven-segment display shows an
H
indicating sequence
selection. One of the line LEDs from 1 to 7 will be indicating the current sequence
selected for the MCU.
3.
Use the
STEP
button to select the desired new sequence.
4.
Press the
DELETE
button. The LED indicates the new sequence 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.
Содержание Link 150
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