Motorola V186 - Cell Phone - GSM System Planner Manual page 113

Communications
Unlike other infrastructures (such as iDEN and TETRA), this IP address and radio unit
ID cannot be retrieved for diagnostics from the radio. Instead a dummy IP Address is
provided by the radio as it is configured using the CPS (Codeplug Programming
Software).
SCADA
Central
Ethernet
Customer
Enterprise
LINE 1
Network
IP
RS-232
Gateway
STS
GGSN
ASTRO IV&D
infrastructure
PDR
Base
RNG
Station
LINE 1
XTL5000 Radio XTL5000 Radio
RTU-A RTU-B
RS-232
STS
A PC running STS can be connected directly to an RTU, directly to a radio, or it can
operate remotely over the CEN.
For an RTU or PC to communicate over the air using an ASTRO IV&D radio, the radio
must be context activated, or registered for data, in addition to the PPP connection over
RS232 interface.
The RTU uses SNMP protocol and sets a value in a MIB variable defined for this radio.
When this succeeds, the radio configuration is completed, and the radio (using the IP
address provided periodically by the GGSN in the infrastructure) is able to receive and
transmit data. If the context activation fails or is deactivated, the RTU causes the radio to
restart (power itself off and on.) Once the radio has been context activated, an RTU (or
PC) can transmit IP frames over the air to the PDR which routes them to the GGSN and
CEN.
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