5.5.1 Ban list
The ban list provides space for 5 entries and is not saved in a volatile memory. This means that it is
also still available following a PowerOn.
If there is a GPRS error (see error codes -975 to -993 in chapter "Modem error" on page 98), then an
internal counter is increased by 2 . If a transmission was completed without errors, i.e. all of the data
was transferred, this internal counter is reduced by 1 . The current GSM network is added to the ban
list if the internal counter reaches the value 6 . The relevant GSM network is automatically added to
the ban list, if the "MODEM CMME ERROR" error occurs (see "Modem error" on page 98) with
parameter 32 (NETWORK NOT ALLOWED) or 529 (MODEM CMME ERROR). The ban list is deleted if no
GSM network can be selected from the list of available GSM networks in the receiving range taking
the ban list into consideration. Another search for GSM networks in the receiving range is completed
once the ban list is deleted and the network selection is completed with the ban list that is now
empty (see step 3 in chapter"Automatic selection of the GSM network" on page 35).
The quality of the data transfer is monitored in addition to the establishment of the GPRS
connection. If the data transmission fails 10 times in succession despite an existing GPRS
connection, the currently selected GSM network is also added to the ban list. The same applies in
this case, which means that if, when taking the ban list into consideration, there is no further GSM
network available, the ban list is deleted and selection of the strongest GSM network is restarted.
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