TrimTrac ProE Locator Technical Manual v2.0e
16
In all cases, the GPRS APN is provided by the carrier and determines how the mobile
device connects to the GPRS network and is authenticated. It is the GPRS functional
equivalent to the SMSC for SMS, if you will.
The GPRS Destination Address, on the other hand, includes both the IP Address and Port
Number of the application server. The IP address can either be a public IP address or, if
the ASP has a direct connection to the carrier, then it can be a private IP address. Either
way, the ASP must assign the Port Number.
The TrimTrac does NOT use DNS in the GPRS Destination Address translation. The
TrimTrac operates exclusively with IP Addresses and Port Numbers and this approach
has proven to be the preferred choice of major ASPs. To achieve the desired level of
redundancy, the most major ASPs maintain multiple Internet connections routed to
separate firewalls located, in some cases, in different data centers. Messages from the
mobile devices get routed to the different firewalls based upon the routing and load
management tables updated by the ASP. If one or more firewall goes down, then
messages are re-routed to the others based upon the routing rules defined by the ASP.
Mobile device messages are passed from these Internet connections to specific
application servers and ports based upon the Network Address and Port Translation
(NAPT) function of each firewall. If the firewalls have load management functionality,
then these messages can be re-directed to other application servers in the data center if
the original target server and/or port are unavailable.
At a much higher application level, use of the TrimTrac Session Protocol and AutoLog
Dump is also recommended. Especially in the case of UDP, the TrimTrac Session
Protocol will help the device recover from short term outages. Whereas, AutoLog Dump
will help the device flywheel through periods of more extended outages.
Expanded GSM Status Codes
The GSM Status Codes listed in all REPORT_POS and STATUS_MESSAGEs have
been expanded in TrimTrac ProE to include:
0=Network Available
1=Message Logged (i.e. Report Delay Flag set=1)
2=Network Timeout
3=SIM Error / No SIM
4=SIM PIN Error
5=Pre-TX log (Low battery)
6=Modem Initialization Failure
7=GPRS Opening Failure
8=TCP Connection Failure
9=Session Protocol Failure
Содержание ProE Locator
Страница 83: ...TrimTrac ProE Locator Technical Manual v2 0e 65 Figure 19 External GPS Antenna Connected to TrimTrac ProE ...
Страница 112: ...TrimTrac ProE Locator Technical Manual v2 0e 94 Figure 24 HPA Processing in TRANSMIT ...
Страница 113: ...TrimTrac ProE Locator Technical Manual v2 0e 95 Figure 25 MPA Processing in TRANSMIT ...
Страница 114: ...TrimTrac ProE Locator Technical Manual v2 0e 96 Figure 26 LPA Processing in TRANSMIT ...
Страница 115: ...TrimTrac ProE Locator Technical Manual v2 0e 97 Figure 27 Other Message Processing in TRANSMIT ...
Страница 150: ...TrimTrac ProE Locator Technical Manual v2 0e 132 Default AT CTKY 10 10 10 10 0 300 60 0 0 0 0 1 0 ...
Страница 177: ...TrimTrac ProE Locator Technical Manual v2 0e 159 ...
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Страница 192: ...TrimTrac ProE Locator Technical Manual v2 0e 174 ZZ Checksum Table 78 RESP_EXT2_APP_CONFIG Message ...
Страница 205: ...TrimTrac ProE Locator Technical Manual v2 0e 187 Quick Reference Tables ...
Страница 231: ...TrimTrac ProE Locator Technical Manual v2 0e 213 Figure 36 Vehicle Adapter Module Alert Wiring Diagram ...
Страница 232: ...TrimTrac ProE Locator Technical Manual v2 0e 214 Figure 37 Control Module Wiring Diagram ...