Specifications

Chapter 3 – Status Control Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 55
lsta Link Stability Indication
The Link Stability indicator feature allows the MC75i to output radio link errors and statistic
parameters of signal strength distribution across the band via URC.
0 Radio link error.
1 Radio link signal strength distribution.
The presentation of the "lsta" indicator is determined by the radio link spectrum shape. For
example, each time a radio link error appears the URC indicates an Error Downcounter value
and the RSSI of the serving cell to provide some kind of warning. Every consecutive error
decrements the Error Downcounter value and successful downlink signal reception resets it to
start value of 10. The factor on which Error Downcounter is decremented depends on network
settings. Error Downcounter value 0 means that the ME has lost the cell and will start the cell
reselection process. In this case the URC is enhanced and includes the following statistic
parameters of signal strength distribution across the band.
These are:
• Number of reported channels,
• Maximal signal strength value,
• Minimal signal strength value,
• Mean value of signal strength across frequency band and
• Variance of signal strength across frequency band.
To avoid that radio link error URCs are output too often, when radio conditions are bad, you
can select a lower warning level with <lstaLevel>.
<indValue>
Integer type value in the range stated above for the corresponding <indDescr>.
Notes specific to the EONS feature:
If the indicator is “eons”, the <indValue> is a type associated to the operator name according to GSM
22.101. This type depends on the source of the operator name.
Priority of types associated to the operator names is defined as follows (the type listed first has the
highest priority). If a type cannot be indicated the next one will be used.
0 Not registered.
1 EF-OPL and EF-PNN (alphanumeric format, can contain up to 24 characters.)
2 Operator Name String in long and short format according to Common PCN Handset
Specification (CPHS) (alphanumeric format, can contain up to 16 characters).
3 Name information received by the NITZ service long and short form (alphanumeric format, can
contain up to 16 characters). The short form will be displayed only if EF
OPShort
from CPHS is
available.
4 Any operator name stored internal to the ME (alphanumeric format, can contain up to 16
characters).
5 Broadcast MCC-MNC (numeric format which consists of a 3-digit country code plus a 2- or 3-
digit network code).
The name information received by the NITZ service (type 3) will be saved in the non-volatile RAM. It
replaces the operator name of the registered PLMN (type 4) or its numeric form (type 5) stored in the ME.
However, when after restart the ME registers to another PLMN that is not equal to the saved NITZ name
information, the NITZ name information must be invalidated. If the type is 2, 4 or 5, AT+COPS with the
appropriate <mode> displays the same operator name.
<mode>
0 Indicator is deregistered; i.e., no such indicator event report (URC) will be issued. <mode>=0 is
power-up and factory default of indicators defined by AT^SIND only.
1 Indicator is registered.
• Indicator event reports are controlled via AT+CMER.
• All indicators can be registered or deregistered via AT^SIND, but different default settings
apply: Power-up and factory default of the indicators supported by AT+CIND is <mode>=1,
while, as stated above, indicators defined by AT^SIND only are set to <mode>=0.
2 Query the registration status and the current value of a single indicator type.