Command:
AT+CGDCONT=1,"IPV4V6","NIMBLINK.GW12.VZWENTP"
Response:
OK
Please note that the quotations are used with both the IP type and the APN.
Command:
AT+CGDCONT?
Response:
+CGDCONT: 1,"IPV4V6","nimblink.gw12.vzwentp",……
At this point, the PDP context has been configured, but not activated. Before activating the PDP
context, two conditions should be evaluated. First, you will need to test the signal strength of
your chosen cellular network. Second, you will need to confirm that you are registered on the
cellular network. The next two sections will walk you through testing network signal strength and
confirming network registration.
3.5.4. Testing the Signal Strength
Cellular functionality of the modem was turned off in the previous section. Therefore, the first
step is to turn back on cellular functionality.
a. Turn on cellular functionality:
Command:
AT+CFUN=1
Response:
OK
b. Check the received signal strength:
Command:
AT+QCSQ
Response:
+QCSQ: <sysmode>, <rssi>, <rsrp>, <sinr>, <rsrq>
3.5.4.1. Description of Parameters
⎻
sysmode
:
The system mode is the current cellular service mode, i.e. “CAT-M1”,
“CAT-NB1”, or “GSM”. If the device is not using any service network or the service mode
is uncertain, "NOSERVICE" will be returned as the query result.
⎻
rssi
: The RSSI or Received Signal Strength Indicator is a measurement of the total
average Radio Frequency (RF) power present in the received radio signal at the mobile
device.
⎻
rsrp
: The RSRP or Reference Signal Received Power is a measurement of average
power from a single cell-specific reference signal within a specific frequency bandwidth.
The value returned is a logarithmic value. The values are in increments of 1/5th a decibel
(dB) and range from 0 to 250, which translates to -20dB to +30dB.
⎻
sinr
: The SINR or signal-to-interference-plus-noise ratio is the power of the signal divided
by the sum of the interference power (from all the other interfering signals) and the
power of the background noise.
PN 1002152 REV A
© NimbeLink Corp. 2019. All rights reserved.
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