Multi-Tech MultiModem EDGE Reference Manual page 47

"eons" Enhanced Operator Name String (EONS) Indication.
The Enhanced Operator Name String indicator feature allows the Multi-Tech wireless
modem to output various operator names for different PLMN identities via URC. It also
allows the output of a different operator name based on a subset of the registered network
by using a range of Location Area Codes (LACs) or a single LAC.
The presentation of the "eons" indicator is determined by network activity. For example, the
indicator appears every time a location update occurs or a NITZ information is sent, no
matter whether or not the status of the EONS information has changed. This means that the
same EONS information may be reported several times.
The EONS tables are stored in the SIM card and will be read at power-up.
This is a list of the SIM Elementary Files that are affected by the introduction of EONS
feature in the SIM card:
Note:
"nitz" Network Identity and Time Zone indication This indicator shows the time relevant information
elements of an MM Information (MMI) or GMM Information (GMMI) message received from the
network (see GSM 24.008, ch. 9.2.15a and 9.4.19). The network usually sends a NITZ
indicator when the mobile attaches to the network, when it enters a location area with different
time zone or when a daylight change occurs.
A NITZ indicator may consist of the following parameters: Universal Time (UT), local Time
Zone (TZ), Daylight Saving Time (DST). All information elements of MMI/GMMI are optional
and, therefore, the presentation of the parameters <nitzUT>, <nitzTZ>, <nitzDST> varies with
the network. For example, the network may send all three parameters UT, TZ, DST, or only UT
and TZ or only TZ.
UT is indicated in usual date/time format and represents the current world time (GMT) at the
moment when sent.
TZ is given as a positive (east) or negative (west) offset from UT in units of 15 minutes.
DST shows the number of hours added to the local TZ because of daylight saving time
(summertime) adjustment. Usually DST is 1 hour but it can be also 2 hours in certain locations.
Example for time and time zone with DST:
+CIEV: nitz,"04/07/23,13:39:20",-28,1
+CIEV: nitz,"04/11/23,13:39:20",-32
Please be aware that despite the last NITZ value can be looked up again via "AT^SIND=nitz,2"
the returned values may be out of date. Especially the UT value is obsolete because there is
no internal NITZ clock and therefore no continuation of UT.
NITZ values are lost when the module detaches from network. Also when a manual network
selection fails and the module automatically falls back to the previous network the NITZ values
cannot be recalled. Nevertheless an indicated time zone is valid until a new MMI/GMMI will
trigger another NITZ indication.
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371G)
EF (SIM Service Table) - describes which features are active.
SST
EF (Operator PLMN List) - contains the PLMN identification and location ID
OPL
together with the index of the corresponding PNN record.
EF (PLMN Network Name) - contains the full and short form version of the
PNN
network name for the registered PLMN.
If the Operator Name Source is CPHS Operator Name String long and short
form, refer to <indValue>, the following two SIM Elementary Files are used:
EF (Operator Name String) - contains the name of the PLMN operator who
ONString
issued the SIM.
EF (Operator Name Short form) - contains a short form of the name of the
OPShort
PLMN operator who issued the SIM.
This note applies only to SIM cards with EF
providers on the North American market:
After SIM PIN authentication, the initial process of reading data from the SIM takes
more than on cards without these two fields. This because the ME first starts reading
SIM data related to phonebooks, SMS or Remote SAT, and then continues to read
EONS data from the EF
and/or the AT^SIND "simstatus" URC are enabled the subscriber may already be
notified that the SIM initialization has completed, although reading the EONS data is
still ongoing for another 2 seconds (without Remote SIM Access) or approx. 10
seconds (if Remote SIM Access was already started). Therefore, trying to access the
SIM during this time may cause the CME Error 14 or CMS Error 315 ("SIM busy") to
occur.
In this example TZ is -28, showing a time offset of -7 hours (west) to Universal Time/GMT
(which never changes for DST). DST is 1 which indicates that one hour was added to TZ
because of Daylight Saving Time. If a network does not send the DST parameter the TZ
value would be -32 (8 hours west) as would be done in winter:
Chapter 3 – Status Control Commands
and EF
OPL
and EF fields. As a result, if the "^SSIM READY" URC
OPL PNN
fields typically used by
PNN
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