Operating Manual Part 15

October 2008 5300 ES Series Mobile Radio Operating Manual 6-23
SMARTNET / SmartZone / P25 Trunked Features
6.14.2 Interface Connection
The radio connects from its MDP Interface to the RS232 COM port of the computer using
the P25 Mobile Data Peripheral (MDP) Interface cable.
6.14.3 Context Activation
In order for the radio to access data service on a trunking system, it must be a valid user on
the system and it must be affiliated to an RF site. Once this is accomplished, the radio
must request data services from the trunked system through the process of context
activation; a data registration of the radio with the system. Context activation is initiated
from the radio. In an EFJohnson Technologies mobile radio, context activation is
automatically initiated when the user selects a P25 trunking system with either data
registration enabled or OTAR enabled. During a context activation, the mobile radio
attempts to access a packet data channel (PDCH) at the site and send it its request for data
services. If the context activation is successful, the mobile subscriber will receive a
response containing a IP address. This IP address will be used by the mobile radio as a
source IP address for all inbound data messages sent, and is used by the host application as
the destination IP address for all outbound data messages. If for some reason the context
activation fails, the mobile radio will not be allowed to use data services on the trunked
system. If a PPP link is established between the portable computer and mobile radio
without the radio context activated, any data transmitted by the computer to the radio is
ignored.
6.14.4 PPP Link Establishment
To begin data transmissions from an application running on a portable computer, a data
connection must first be established between the mobile computer and the radio (with data
capability enabled). This is accomplished by creating a new dial up connection using the
Microsoft Windows Operating System.
Note The following screen shots are derived from Windows XP.
The network connection screen can be accessed through the control panel. Click the create
a new connection link.
1 Using the Control Panel, access the Network Connection screen (Figure 6.1).