Data protocol and monitoring system for RF trunking multisite switch global serial channel
First Claim
1. In a radio frequency multisite system of the type having a multisite switch comprising a local area network of nodes each having one or more microprocessor supported audio cards connected to a slotted audio bus within the switch, and a controller card operatively coupled to said audio cards and to a message bus within said switch, a method of communicating audio slot assignments within the multisite switch, said method comprising the steps of:
- generating an audio slot assignment message in a first node of said nodes having a first byte designating the message as a slot assignment message and one or more bytes identifying an audio slot;
broadcasting the slot assignment message on the message bus;
another node receiving and processing the slot assignment message from the message bus.
1 Assignment
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Accused Products
Abstract
A multisite network switch for a series of RF digital trunked radio transceivers and dispatcher consoles. Each transceiver covers a certain site area. The switch establishes audio communications between different sites and various dispatcher consoles. The multisite switch has a distributed architecture in which each node of the switch is supported by a microprocessor controlled card. The nodes are connected by audio buses and a dedicated message bus. The messages on the message bus allow the nodes to communicate control information regarding the status of slots on the audio bus, the members in groups, the location of radio units, call types and a host of other information needed to operate the switch.
33 Citations
8 Claims
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1. In a radio frequency multisite system of the type having a multisite switch comprising a local area network of nodes each having one or more microprocessor supported audio cards connected to a slotted audio bus within the switch, and a controller card operatively coupled to said audio cards and to a message bus within said switch, a method of communicating audio slot assignments within the multisite switch, said method comprising the steps of:
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generating an audio slot assignment message in a first node of said nodes having a first byte designating the message as a slot assignment message and one or more bytes identifying an audio slot; broadcasting the slot assignment message on the message bus; another node receiving and processing the slot assignment message from the message bus. - View Dependent Claims (3, 4, 5)
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2. In a radio frequency multisite system of the type having a multisite switch comprising a local area network of nodes each having one or more microprocessor supported audio cards connected to a slotted audio bus within the switch, and a controller card operatively coupled to said audio cards and to a message bus within said switch, a method of communicating audio slot assignments within the multisite switch, said method comprising the steps of:
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generating an audio slot assignment message in a first node of said nodes having a first byte designating the message as a slot assignment message, the second and third bytes identifying an audio slot, the fourth byte identifying the host placing the call corresponding to the slot assignment message, the fifth and sixth bytes designating message groups, the seventh byte indicating call qualifier flags and the remaining bytes identifying the callee and caller; broadcasting the slot assignment message on the message bus; another node receiving and processing the slot assignment message from the message bus. - View Dependent Claims (6, 7, 8)
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Specification