Other

Persistent Systems Limited

Herbert B Rubens

David G Holmer

Artur Zak

Devices and methods are provided that permit interoperability between Radio over Internet Protocol (RoIP) devices and land mobile radio (LMR) devices. In one device according to the invention, a networked radio includes a wireless network transceiver, an LMR signal connector, and an analog-to-digital converter/digital-to-analog converter (ADC/DAC). A computer processor that inputs data from or outputs data to the ADC/DAC includes a sound architecture and a server. The server includes a digital audio buffer, a voice-activity detector, and a daemon. The daemon is configured to (1) collect data on one or more variables affecting a best-choice determination for transmitting a communications signal intended for retransmission to one or more LMR devices, and (2) make the best-choice determination based on the data collected.

Radio over internet protocol devices and methods for interoperability with land mobile radio devices

Systems and methods are provided for routing data through a network. In one system, a first node is enabled to overhear packet transmissions from a second node. The cost of transmitting packets from the first node to the second node is updated based on each overheard packet transmission. In another system, when the cost of transmitting packets from a source to an overhearing node to a destination is less than the cost of transmitting packets from the source to the destination, an advertisement is sent to the source causing the packet transmissions to be routed from the source to the destination through the overhearing node. In yet another system, using a safe-sequence tag that is attached to any packet transmitted by any node and updated when it is received by another node, along with stored histories of best metric advertisements, predetermined rules are applied to maintain loop freedom.

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New York, NY, United States of America

Herbert B Rubens