Specifications

Table Of Contents
APPENDIX E: INTEROPERABILITY
Page 213 MRC-565 Packet Data Radio Operations & Maintenance
will then report in sequence, in accordance with their assigned transmit slots. The base station
acknowledges the data received from each of the ten mobiles and then polls ten more mobiles on
the next burst transmission.
Using the above techniques, there is no contention and all reports are delivered at a 90% channel
utilization rate. With these efficiencies, sufficient channel time is still available for two-way
messaging and various other non-periodic data transfers using the CSMA mode.
The MRC-565C is the only VHF transceiver used in the network. It can be dynamically
configured to operate in three distinct modes: as a remote (mobile), as a base station or as a
repeater station. As a base station, it also maintains RF communications with all mobiles
operating within its own cell network, routing all data to a Host through a data network
connected to one of its RS-232 ports.
When a direct connection to a central Host is not available at a particular base station site, the
MRC-565C is configured to operate as a repeater station. As a repeater station, it routes all data
to the nearest base station for subsequent delivery to the Host. Multiple repeater links may be
chained together for expansion of the network.
As a mobile, the MRC-565C is free to roam throughout the network, automatically linking with
the nearest base station or repeater. When mobiles are out of range of a repeater or base station,
but within range of other mobiles, they will automatically select another mobile as their repeater
into the network. The only mobiles that may be selected are ones that have connectivity with a
repeater or base station.