User's Manual Part 1

36 APCD-LM043-8.0 (DRAFT C)
3: Detailed Description
adjacent to the ISM band does not exceed FCC and Industry Canada limits.
Figure 22 Determination of Lowest and Highest Channel
The channel bandwidth also determines the minimum adjacent channel spacing for co-located
CCUs.
3.5.3 Channels
There are 101 channels in the band, set in 0.2 MHz increments:
Table 1 LMS4000 900MHz Radio Network Channelization
3.5.4 Modulation
The CCU-EUM radio channel is based on DSSS (Direct-Sequence Spread Spectrum) signals,
modulated with CCK and Barker-coded BPSK and QPSK, similar to that defined in IEEE
802.11 for the 2.4 GHz ISM band.
DSSS offers the following advantages:
Channel Center Frequency
Lowest channel 905.0 MHz
... 905.2 MHz
... 905.4 MHz
... ...
... 924.8 MHz
Highest channel 925.0 MHz
902 - 928 MHz ISM Band
FCC limit for
emissions in
adjacent band
Lowest
Channel
905 MHz
Highest
Channel
925 MHz