20 System Feature Overview
On a Capacity Plus personality, the Option Board is not aware of the transmit or receive
channel. Additionally, an Option Board does not use or create Virtual Personalities in a
Capacity Plus system. Hence, an Option Board will not be able to customize the current
working personality.
• Transmit Interrupt: The Voice Interrupt, Emergency Voice Interrupt, Remote Voice
Dekey, and Data Over Voice Interrupt features are supported on Capacity Plus systems.
Capacity Plus does not provide the following features:
• Coverage of multiple sites,
• Call queuing, priority, and preemption,
• Priority Monitor: Capacity Plus provides higher priority only to an All Call,
• Radio access control.
Greater detail on system services available in direct-mode and repeater-based system topologies
is described in
“System Components and Topologies” on page 163.
2.2.1.6 Linked Capacity Plus Mode
When operating in Linked Capacity Plus Mode, MOTOTRBO trunks the logical channels (that is,
the TDMA slots) of multiple MOTOTRBO repeaters (operating in digital repeater mode) at multiple
locations and combines the logical channels into one logical channel. This allows radios to share
the logical channels, as well as increase the RF coverage area of a MOTOTRBO system.
Linked Capacity Plus (LCP) is a trunked multisite multi-channel configuration of MOTOTRBO,
which combines both the Capacity Plus and IP Site Connect configurations. This combined
configuration requires only software updates for radios and repeaters, but does not require any
new hardware.
NOTE: Only repeaters with 32 MB of internal memory (e.g. DR 3000 or MTR3000) can support
the LCP configuration.
Linked Capacity Plus uses the IP Site Connect type of backend network for communication
between sites. The IP Site Connect supports a wide variety of backend networks from a dedicated
network to an internet provided by the ISP. Linked Capacity Plus supports all backend networks
supported by IP Site Connect, but more bandwidth is required from an ISP provider for a LCP
system, compared to an IP Site Connect system. The backend is designed to work seamlessly
with internet connectivity. The system requires only one of the repeaters to have a static IPv4
address. Additionally, the system avoids the need for reconfiguration of a customer’s network,
such as reprogramming of firewalls.
Similar to Capacity Plus, LCP repeaters at a site are connected over a LAN. A Capacity Plus
repeater uses multiple individual messages to communicate with the rest of the repeaters on site.
However, an LCP repeater sends a broadcast message to IP Limited Broadcast Address
(255.255.255.255). The broadcast messages may produce some adverse effects on the other
devices present on the LAN. Therefore, an LCP configuration requires only the LCP repeaters to
be present on the LAN.
The call start-up of LCP is a combination of IP Site Connect and Capacity Plus configurations with
the following enhancements:
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