Harris Unity XG-100P - Appendix A PPP;SLIP CONNECTION; A.1 OVERALL CONFIGURATION

10515-0372-4200, Rev. R
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APPENDIX A PPP/SLIP CONNECTION
A.1 OVERALL CONFIGURATION
This appendix describes how to setup PPP and SLIP connections between a Unity Portable radio acting as
a Mobile Data Terminal (MDT) and a Mobile Data Peripheral (MDP). The MDP in Figure A-1 is a
Windows XP machine. This example is used throughout the configuration, but is only intended as a
guide. It is important to realize that all IP addresses are site/configuration specific. Prior to configuring
the MDT or the MDP, the system administrator should provide configuration specifics.
RF IP
10.1.101.209
Site1 IP
10.1.101.27
Site2 IP
10.2.101.27
Radio2 IP
10.2.101.200
PPP IP
10.1.101.209
PPP IP
199.81.106.100
Public IP
84.100.1.1
MDP Unity MDT IP Radio
Cable
12082-0445-A1
Figure A-1: Example of PPP/SLIP Configuration
• MDP PPP IP Address – There are two types of configuration for the MDP’s IP address, dynamically
assigned by PPP or statically assigned within the MDP’s PPP configuration settings:
 Dynamic via PPP (shown in Figure A-1) - When using PPP’s dynamic IP address assignment, the
radio will assign its own RF IP address to the MDP. Outbound IP data from the site will be
processed by the radio if the port matches the ports within the radio’s services (Radio Textlink,
OTAR, OTAP, etc.). All other outbound IP data from the site is forwarded to the MDP. Inbound
IP data from the MDP will be processed by the radio if the MDP uses the radio’s PPP IP address;
otherwise, it will be forwarded to the site.
 Static – The MDP software allows the configuration of a static IP address to the MDP. While this
provides more configurability, routing of traffic to the MDP from the site must be configured
within the site’s routers.
• Unity MDT’s PPP IP – This is typically a nonce IP address (shown in Figure A-1) to allow the MDP
to address the radio explicitly (i.e., ping).
• Unity MDT’s RF IP – This IP address is how the site addresses the radio and must match
configuration at the site.
Other IP addresses in the figure above are beyond the scope of this configuration document and are
provided for the purpose of the configuration example only.