PMP 450 Configuration and User Guide
Task 6: Configuring radio parameters
pmp-0050 (May 2012)
2-83
Attribute
Meaning
Signal to Noise Ratio
Calculation
Enabling this parameter allows operators to use Signal-to-Noise calculations
to monitor link quality.
The Signal-to-Noise Ratio may be monitored on the AP‘s Session Status page,
Link Capacity Test page, and Link Status page.
See the table below for required Signal-to-Noise Ratios required for each
modulation state:
Modulation
Downlink
Uplink
1X
7 dB
9 dB
2X
15 dB
16 dB
3X
23 dB
24 dB
Note that locking a radio a lower modulation may result in a lower SNR ratio
reading that a higher modulation. For example an AP/SM pair that is getting
a SNR of 23/29 dB for downlink/uplink when modulation is set to 1X/2X/3X
gets 22/27 dB for a setting of 1X/2X. And when set to 1X (No rate adapt) the
SNR reads 12/18 dB. For highest SNR calculation the rate adapt must be set
to its highest rate adapt modulation.
Max Range
Enter a number of miles (or kilometers divided by 1.61, then rounded to an
integer) for the furthest distance from which an SM is allowed to register to
this AP. Do not set the distance to any greater number of miles. A greater
distance
does not increase the power of transmission from the AP.
can reduce aggregate throughput.
Regardless of this distance, the SM must meet the minimum requirements for
an acceptable link. If the AP is in cluster, then you
must
set this parameter on
all other APs in the cluster exactly the same, except as described in the NOTE
admonition below. The default value of this parameter is 2 miles (3.2 km).
For the PMP 450 Series AP, the typical maximum range achievable depends
on the operation mode as follows:
5 miles (8 km) in 1X operation
2.5 miles (4 km) in 2X operation
1.25 miles (2 km) in 3X operation
A value of 15 for this parameter decreases the number of available data slots
by 1. With a higher value, the number is further decreased as the AP
compensates for the expected additional air delay.
Summary of Contents for PMP 450
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