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    • 5. 发明授权
    • Audio routing within trunked radio frequency multisite switch
    • 集群无线射频多站点交换机内的音频路由
    • US5699354A
    • 1997-12-16
    • US336204
    • 1994-11-04
    • Philip C. GullifordWim A. ImronJames L. Teel
    • Philip C. GullifordWim A. ImronJames L. Teel
    • H04W4/10H04W84/08H04B3/36
    • H04W84/08H04W4/10H04W76/005
    • A distributed trunked radio frequency (RF) switching network (multisite switch) distributes audio routing control information and digitized audio signals to communications interface modules (nodes) throughout the multisite switch, thus avoiding a centralized mixing matrix, increasing fault tolerance and providing low routing request latency time. Each audio source, (for example, RF repeater transmitter, dispatch console microphone) is preassigned an audio channel on a time division multiplexed (TDM) digitized "audio network" or bus within the switch. The audio sources continually provide digitized audio signals to all other nodes within the switch over the assigned TDM bus channels. Audio routing is performed at the audio destinations (for example, interface modules/nodes associated with RF repeater receivers, dispatch console speakers) by selectively "listening" to active TDM network channels. In the preferred embodiment, audio is routed undirectionally on an "as needed" basis (for example, in response to radio transceiver "keys" and "unkeys"), and audio routing pathways may change dynamically during an on-going call.
    • 分布式中继射频(RF)交换网络(多站点交换机)将音频路由控制信息和数字化音频信号分配到整个多站点交换机的通信接口模块(节点),从而避免集中式混合矩阵,增加容错能力并提供低路由请求 延迟时间 每个音频源(例如,RF中继器发射机,调度台麦克风)在交换机内的时分复用(TDM)数字化“音频网络”或总线上预先分配音频信道。 音频源通过分配的TDM总线通道连续向交换机内的所有其他节点提供数字化音频信号。 通过选择性地“收听”到有效的TDM网络信道,在音频目的地(例如,与RF中继器接收机,调度台扬声器相关联的接口模块/节点)上执行音频路由。 在优选实施例中,音频在“根据需要”的基础上(例如,响应于无线电收发器“键”和“钥匙”)被不定向地路由,并且音频路由路径可以在正在进行的呼叫期间动态地改变。
    • 7. 发明授权
    • Multisite trunked RF communication system with reliable control
messaging network
    • 多站点集群RF通信系统具有可靠的控制消息传递网络
    • US5365512A
    • 1994-11-15
    • US84944
    • 1993-07-02
    • Edward A. CombsDennis M. MaddoxWim A. Imron
    • Edward A. CombsDennis M. MaddoxWim A. Imron
    • H04W84/08H04J3/14G06F11/20
    • H04W84/08
    • A distributed switching network (switch) routes audio and control signals throughout the switch from various audio sources to one or more audio destinations. Audio sources such as mobile/portable radio units (via RF repeater transmitters), dispatch consoles, and landline telephone subscribers (via the central telephone switching network) are preassigned and routed onto an audio channel (i.e. a time slot) on a time division multiplexed (TDM) audio bus through a corresponding node. Each microprocessor controlled node is connected to plural control message buses provided for transferring control messages between nodes. A first supervisory node is physically connected at one end of the message buses and an end node is connected at the other end. If the end node fails to respond to a polling message from the supervisory node within a predetermined time period, the supervisory node assumes that the current messaging bus is faulty and initiates a bus switching operation to an alternate messaging bus. The supervisory and end nodes thereafter coordinate switching of all nodes in the switch to the alternate control messaging bus to insure reliable trunked RF communications over the multisite network.
    • 分布式交换网络(交换机)将整个交换机的音频和控制信号从各种音频源路由到一个或多个音频目的地。 诸如移动/便携式无线电单元(经由RF中继器发射机),调度控制台和固定电话用户(经由中央电话交换网络)的音频源被预分配并且被路由到时分多路复用的音频信道(即时隙) (TDM)音频总线通过相应的节点。 每个微处理器控制的节点连接到多个用于在节点之间传送控制消息的控制消息总线。 第一个监督节点在消息总线的一端物理连接,另一端连接一个终端节点。 如果终端节点在预定时间段内没有响应来自监督节点的轮询消息,则监督节点假定当前消息总线是故障的,并且启动到备用消息总线的总线切换操作。 监督和结束节点之后协调交换机中所有节点的切换到备用控制消息总线,以确保通过多站点网络的可靠的中继RF通信。