User Manual

Canopy 900 MHz AP and SM User Guide
Issue 1, Draft 1 June, 2004 Page 9 of 16
2.3 Available as AP and SM – no Backhaul
Description
AP and SM modules are available for building 900 MHz Point to Multi-point networks. Backhauls are not
provided, as the narrower bandwidth available in the allocated 900 MHz frequency band does not lend
itself to the capacity usually desired for backhauls.
2.4 Three non-overlapping channels
Description
The Canopy 900 MHz modules provide 3 non-overlapping channels within the allocated 900 MHz
spectrum. Channels are 8 MHz wide, and can be set with RF Frequency Carrier (center of the channel) at
906, 907, 911, 915, 919, 923, or 924 MHz. For normal operation, it is recommended that the operator use
• 906 MHz for north and south facing APs
• 915 MHz for northeast and southwest facing APs
• 924 MHz for southeast and northwest facing APs
Note, this takes advantage of the spectrum available to provide 9 MHz between channel centers, 1 MHz
greater than the minimum 8 MHz channel size, for additional channel separation.
Operation
On the AP Configuration page, set the RF Frequency Carrier parameter to the desired frequency as shown
in Figure 2: Highlights of 900 MHz AP Configuration Page.
On the SM Configuration page, select/check the desired frequencies in the Custom RF Frequency Scan
Selection List.
Depending on local practices, this may mean selecting all frequencies to scan (the SM will register to any
frequency, but takes longer to scan), only one frequency to scan (forces the SM to only register to an AP on
that frequency and minimizes scan time after SM reboot), or the three recommended AP frequencies of
906, 915, and 924 MHz (allows for an SM to “switchover” to an AP on another frequency if the one it is
registered to fails or loses signal).