User guide

Considering Frequency Band Alternatives Engineering Your RF Communications
134
pmp-0229 (Mar 2013)
Module Types Further Investigation Result Recommended Action
CAP 130
with
CSM 120
Check the General Status tab
of the CSM 120.
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.
Results are
inconsistent and
range from 20% to
80% Efficiency.
Monitor the Session Status tab in
the CAP 130.
Monitor the Session Status tab
in the CAP 130.
Link fluctuates
between 2X and
1X operation.
3
Optionally, re-aim SM, add a
reflector, or otherwise mitigate
interference. Then rerun link tests.
Rerun link tests.
No substantial
improvement with
consistency is
seen.
On the General tab of the SM,
disable 2X operation. Then rerun
link tests.
Rerun link tests.
Uplink and
downlink are both
≥90% Efficiency.
Continue 1X operation up and
down.
NOTES:
1. Or check Session Status page of the CAP 130, where a sum of greater than 7,000,000 bps for the up- and
downlink indicates 2X operation up and down (for 2.4- or 5.x-GHz modules.
2. For throughput to the SM, this is equivalent to 120% Efficiency in 1X operation, with less capacity used at
the AP.
3. This link is problematic.
Considering Frequency Band Alternatives
For 5.2-, 5.4-, and 5.7-GHz modules, 20-MHz wide channels are centered every 5 MHz. For 2.4-
GHz modules, 20-MHz wide channels are centered every 2.5 MHz. For OFDM, the operator can
configure center channel frequencies of the 10 MHz channels with a granularity of 0.5 MHz. This
allows the operator to customize the channel layout for interoperability where other equipment is
co-located.
Cross-band deployment of APs and BH is the recommended alternative (for example, a 5.2-GHz
AP co-located with 5.7-GHz BH).
IMPORTANT!
In all cases, channel center separation between co-located FSK modules should
be at least 20 MHz for 1X operation and 25 MHz for 2X. For OFDM, channel
center separation between co-located modules should be at least 10 MHz.