User guide

Canopy System User Guide Using Link Efficiency to Check FSK
Received Signal Quality
pmp-0229 (Mar 2013)
133
Comparing Efficiency in 1X Operation to Efficiency in 2X
Operation
Efficiency of at least 98 to 100% indicates a high quality signal. Check the signal quality
numerous times, at various times of day and on various days of the week (as you checked the RF
environment a variety of times by spectrum analysis before placing radios in the area). Efficiency
less than 90% in 1X operation or less than 60% in 2X operation indicates a link with problems that
require action.
When to Switch from 2X to 1X Operation Based on 60%
Link Efficiency
In the above latter case (60% in 2X operation), the link experiences worse latency (from packet
resends) than it would in 1X operation, but still greater capacity, if the link remains stable at 60%
Efficiency. Downlink Efficiency and Uplink Efficiency are measurements produced by running a
link test from either the SM or the AP. Examples of what action should be taken based on
Efficiency in 2X operation are provided in Table 32.
Table 32: Recommended courses of action based on Efficiency in 2X operation
Module Types Further Investigation Result Recommended Action
CAP 130
with
CSM 130
Check the General Status tab
of the CSM 130.
1
See Checking
the Status of 2X Operation on
Page 91.
Uplink and
downlink are both
≥60% Efficiency.
2
Rerun link tests.
Rerun link tests.
Uplink and
downlink are both
≥60% Efficiency.
Optionally, re-aim SM, add a
reflector, or otherwise mitigate
interference. In any case, continue
2X operation up and down.