System Feature Overview 17
68007024085 April 2011
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 in software version
R01.07.00 or later. 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, 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.
5. When operating in Capacity Plus Mode, MOTOTRBO trunks the logical channels of
multiple MOTOTRBO repeaters (operating in digital repeater mode) at the same location.
This allows the radios to share the logical channels, resulting in less waiting time to
access the system and increased channel capacity for a given quality of service. Another
advantage is that the probability of all channels being busy at the same instant is low,
therefore the probability of a call being blocked is lower than when only one channel can
be accessed.
Capacity Plus is a single site trunking configuration of the MOTOTRBO system. In a
Capacity Plus configuration, all the “idle” radios (i.e. radios neither receiving nor
transmitting) are on an idle channel called the Rest Channel. Therefore, a new call always
starts on the Rest Channel. At the start of a call, the Rest Channel repeater selects one of
the idle channels as the new Rest Channel, informs the radios on the current Rest
Channel about the new Rest Channel, converts the current Rest Channel to a traffic
channel, and starts repeating the bursts sent by the radio. The radios that are not
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