Rainbow Electronics GM862-GPS - Manual (Page 19)

GM862-GPS Software User Guide
1vv0300729 Rev. 5 - 05/07/07
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27 -59 dBm MMI may indicate 4 antenna bars
28 -57 dBm MMI may indicate 4 antenna bars
29 -55 dBm MMI may indicate 4 antenna bars
30 -53 dBm MMI may indicate 4 antenna bars
31 -51 dBm or more MMI may indicate 4 antenna bars
99 not detected MMI may indicate flashing antenna bars
NOTE: when <rssi> is less than 6, only 1 MMI antenna bar, the quality of a call will be poor and
the call may even drop.
<ber> is an integer from 0 to 7 and 99 that reports the received signal quality measured on the radio
traffic channel.
NOTE: The quality is measured on the traffic channel, hence it is available only during a
conversation, in Idle the reported value must not be considered.
In conversation the quality decreases with the increase of the <ber> number.
NOTE: The <ber> value refers strictly to the GSM radio channel and is a very technical
parameter, it can be used to monitor the voice call quality since the voice quality is inversely
proportional to the <ber> number.
NOTE: For Data calls the signal quality reported is not directly connected to the connection
quality. The reported signal quality refers only to the GSM radio channel link and not to the
whole path from the caller to the receiver, so it may happen that the quality on the GSM radio
link is very good and hence the reported <ber> is 0 (good quality) but the quality of the
remaining path to the other party is very bad and hence the final data connection quality is
very poor.
For this reason the signal quality indicator <ber> should not be taken into account to monitor
data calls quality.