Erco&Gener GENPRO 40E R2, Руководство пользователя

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Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCOGENER reserves the right to make any modifications.
Dct_427_02
5.5 Checking the quality of the GSM reception signal
To know the reception level, an activated SIM card must be inserted in the GenPro 40e.
The modem will be able to make a call only if the received GSM signal is powerfull enough.
The command
AT+CSQ
allows to know the reception level (
rssi
) of the signal sent by the closest GSM Base
Transceiver Station (BTS), as well as the reception error code (
ber
).
When the SIM card is inserted and the PIN code entered, the command
AT+CSQ
allows to know the
measure of the signal coming from the BTS of the subscribed operator network.
The message "ERROR" is sent if the SIM card is absent or if it was not activated (PIN code not
entered).
To check the quality of the GSM signal, do the following operations:
With a communication software like Hyperterminal, enter the command
AT+CSQ
.
The response is in the following format:
+CSQ : <rssi>, <ber>
with :
<rssi>
= indicates the reception level,
<ber>
= receive bit error rate.
Check the answered value
<rssi>
with the help of the table below.
Table 8 : Quality of reception signal CSQ
Value of
<rssi>
Gain in dbm Interpretation Value of
<ber>
Interpretation
0 -113 dbm Insufficient 0 to 7 See recommendation
3GPP TS 45.008
1 to 10 -111 to -95 dbm Insufficient
11 to 30 -93 to -53 dbm Sufficient
31 (max) -51dbm Perfect
99 Unknown/not detectable 99 Unknown/not detectable
The GSM modem works normally with a minimum
<rssi>
between 11 and 15.
Below 10, the signal level is insufficient; the modem cannot work depending on the geographical
situation or the vehicle mobility. Above 15, the signal is sufficient.
This is not valid for UMTS and LTE communications where the level can be a lot lower.
For more information about the AT commands, see the document "
4118014 AirPrime EM73xx-MC73xx AT
Command Reference
".