System Feature Overview 17
• To increase the RF coverage area of a MOTOTRBO system.
• To provide voice and data communication between two or more MOTOTRBO single
site systems located at geographically separate locations.
• To provide voice and data communication between two or more MOTOTRBO single
site systems operating in different frequency bands (e.g. 800/900 MHz, VHF, and
UHF).
The backend network of an IP Site Connect system is designed to work seamlessly with internet
connectivity provided by an Internet Service Provider (ISP). The system only requires that one of
the repeaters have a static IPv4 address, while the others may be dynamic. Also, the system
avoids the need for reconfiguration of a customer’s network such as reprogramming of firewalls.
When a new call starts at one of the logical channel of a repeater, the repeater sends the call to all
the repeaters and all these repeaters repeat the call on their corresponding logical channel. This
allows a radio in the coverage area of any repeater to participate in the call. Thus, the coverage
area of an IP Site Connect system is the sum of the coverage areas of all the repeaters. However,
note that an IP Site Connect configuration does not increase the capacity (i.e. number of calls per
hour) of the system. The capacity of one Wide Area Channel of an IP Site Connect system is
approximately the same as that of a single repeater working in digital repeater mode.
In an IP Site Connect configuration, MOTOTRBO radios support all the features that they already
support in digital repeater mode. This also includes Transmit Interrupt features that are supported
on logical channels configured over wide area networks. Additionally, the radios are capable of
automatically roaming from one site to another.
The IP Site Connect configuration of MOTOTRBO does not require any new hardware besides
backend network devices such as routers. If a customer has multiple MOTOTRBO systems
working in digital repeater mode at dispersed sites and wants to convert them into an IP Site
Connect system then the repeaters and the radios should be updated with new software and the
repeaters need to be connected to an IPv4-based backend network. It is possible to configure a
repeater such that
• Both logical channels work in IP Site Connect mode (i.e. over wide area).
• Both logical channels work in digital repeater mode (i.e. single site over local area).
• One of its logical channels works in IP Site Connect mode (i.e. over wide area) and
the other logical channel works in digital repeater mode (i.e. single site over local
area).
MOTOTRBO has three security features in the IP Site Connect configuration.
• Provides the confidentiality of voice and data payloads by extending the privacy
feature, whether Basic or Enhanced, or Advanced Encryption Standard (AES), to
cover the communication over the backend network.
• Ensures that all the messages between repeaters are authentic.
• Supports Secure VPN (Virtual Private Network) based communication between the
repeaters for customers needing higher level of security (protection against replay
attack).
The IP Site Connect configuration of MOTOTRBO provides a mechanism and a tool to remotely
manage repeaters. The tool (called RDAC) receives alarms from all the repeaters, helps in
diagnosis of repeaters, and provides some controls over the repeaters.
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