User guide

Designing Your Canopy Network March 2005
Through Software Release 6.1
Issue 1 Page 115 of 425
Canopy System User Guide
6. Assess whether the desired links for this module achieve
◦ RSSI greater than 700.
◦ jitter value between 0 and 4 in Release 4.0 and later releases or between 5
and 9 in any earlier release.
7. Access the Link Test page of the module.
8. Assess whether the desired links for this module achieve
◦ uplink efficiency greater than 90%.
◦ downlink efficiency greater than 90%.
9. If the desired links fail to achieve any of the above measurement thresholds, then
a. access the module by direct Ethernet connection.
b. access the Configuration page of the module.
c. in the Power Control parameter, click Full.
d. click Save Changes.
e. click Reboot.
end of procedure
12.6.4 Avoiding Other Interference
Where signal strength cannot dominate noise levels, the network experiences
◦ bit error corrections.
◦ packet errors and retransmissions.
◦ low throughput and high latency (because so much bandwidth is consumed by
retransmissions).
Be especially cognitive of these symptoms for 900-MHz links. Where you see these
symptoms, attempt the following remedies:
◦ Adjust the position of the SM.
◦ Deploy a band pass filter at the AP.
◦ Consider adding a remote AP closer to the affected SMs.
Certain other actions, which may seem to be potential remedies, do not resolve high
noise level problems:
◦ Do not deploy an omnidirectional or vertically polarized antenna.
◦ Do not set the antenna gain above the recommended level.
◦ Do not deploy a band pass filter in the expectation that this can mitigate
interband interference.