Installation guide

89
Cisco uBR7200 Series Universal Broadband Router Wireless Modem Card and Subsystem Installation and Configuration
78-6030-03
Command Reference
radio snapshot
A snapshot is a specified amount of data captured from the wireless modem card. Use these commands
in privileged configuration mode to manipulate snapshots on the modem card.
Use the radio snapshot command to create a snapshot specification. When this command is entered, the
specification is created and the data is captured. Use the no form of the command to delete a specification
and its associated data.
Use the show interfaces radio snapshot command to display the configured snapshot information.
Use the show interfaces radio snapdata command to display the data captured for the snapshot
specification.
Reading the Data
Some data returned by the DSPs can be more useful if you convert it to more meaningful values. Table 16
provides conversion formulas.
Use the radio interface radio snapcapture command to capture another snapshot on the identified DSP.
The snapshot specification already configured on the DSP will be used.
Use the radio interface radio snapclear command to clear the data collected for the specified snapshot
on the identified DSP.
When a snapshot request is issued, up to four simultaneous radio signal attributes can be captured. The
four attributes are specified by adding the attribute numbers for up to four of the snapshot types identified
below.
Table 16 Value Conversions
Parameter Units Reported (X) Units Conversion Formula
receivedPower 1 DSP Receive Signal Strength Same Same
totalGain 1 0.5 dB dB X/2
gainSettingIF 1 0.5 dB dB X/2
gainSettingRF 1 2
(-16)
dB dB X/2
16
constVariance 86016/(10
(0.1*SNRdb)
) SNR in dB 10 * log10(86016/X)
freqOffset 11.71875/2
16
kHz kHz X/5592.4
syncStatus No units Same Same
timingOffset In samples Same Same
receivedPower 2 DSP Receive Signal Strength Same Same
totalGain 2 0.5 dB dB X/2
gainSettingIF 2 0.5 dB dB X/2
gainSettingRF 2 2
(-16)
dB dB X/2
16
in 1 SINR = 10*log10(x/2
16
) + 9 SINR in dB 10 * log10(2
16
/X) + 9
in 2 SINR = 10*log10(x/2
16
) + 9 SINR in dB 10 * log10(2
16
/X) + 9
inr log2 (Ratio) In ratio in dB 10 * log10(2
x
)
byteErrors Number of errors Same Same