Installation guide

48
Cisco uBR7200 Series Universal Broadband Router Wireless Modem Card and Subsystem Installation and Configuration
78-6030-03
Command Reference
Simplified Procedure to Choose Throughput Setting
These steps help determine the throughput setting by trying each setting and choosing the one that gives
acceptable error performance:
Step 1 Initiate the link using the low throughput setting.
UBR04(config-if) # radio channel-setup bandwidth 12.0 throughput low
Step 2 Clear the link-metrics counters.
UBR04 # clear radio interface radio slot/port link-metrics
Step 3 Check the error performance of the link using the following link-metrics commands:
UBR04 # show radio interface radio slot/port 1second-metrics delta
UBR04 # show radio interface radio slot/port link-metrics
Step 4 If the results of these commands show post-ARQ errors, or errored or severely errored seconds that
exceed the requirements for the link, examine the antennas and cabling for faults, re-examine the
link-planning calculations, and determine if more fading exists than had been expected. Use a spectrum
analyzer or the histogram commands to examine the total automatic gain control gain (totalGain) and
the constellation variance (constVariance).
Note To calculate an estimate for Received Signal Strength Indicator (RSSI), measure the
totalGain of the antenna using the command:
UBR04(config-if) # radio histogram totalGain 1 0 4 5 collectionInterval 10
periodic 10 sum true.
This histogram reflects measurements for a single antenna system (main antenna). (Similar
measurements can be performed on the diversity antenna by setting the antenna_num
parameter to 2.) The start bin value is set to 0, the bin delta is set to 4, and the number of bins
is set to 5.
To calculate the Average Received Signal Power, use the average totalGain value from the
histogram in the following equation:
Average Received Signal Power = –96 + (average TotalGain)/2 dBm
For additional details on histogram commands, refer to the “radio histogram”section.
Step 5 If the link meets the required error thresholds, repeat steps 2 and 3 using the medium throughput
setting. If the link does not meet the required thresholds using the medium setting, use the low setting
for normal operation.
Step 6 If the link meets the required thresholds using the medium setting, repeat steps 2 and 3 using the high
throughput setting. If the line does not meet the required thresholds using the high setting, use the
medium setting for normal operations.
Error-correction coding 7/8-rate 7/8-rate 1/2-rate
Cyclic-prefix setting short long long
Table 9 6-MHz Bandwidth Values (continued)
Throughput Setting High Medium Low