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1.发明授权Integrated RF loopback test apparatus for redundant data radio transceiver system 有权用于冗余数据无线电收发系统的集成式RF环回测试仪公开(公告)号：US06996057B2
公开(公告)日：2006-02-07
申请号：US09971451
申请日：2001-10-05
IPC分类号： H04L12/26
摘要： A redundant communication system contains a principal transceiver and a back-up transceiver to be controllably substituted for the principal transceiver. A monitor protection switch, which controls swapping the two transceivers, has an RF loopback test circuit that is switchably coupled to whichever transceiver is the back-up. The RF loopback test circuit monitors the operational capability of the back-up transceiver, and provides an indication of its functionality. If the back-up transceiver is defective, corrective action can be taken in advance of a potential operational failure of the principal transceiver. As long as the RF loopback test circuit indicates proper operational capability of the back-up transceiver, the redundant transceiver can be immediately switched in place of the principal transceiver.
摘要翻译： 冗余通信系统包含主要收发器和可控制地代替主收发器的备用收发器。 控制交换两个收发器的监视器保护开关具有RF回路测试电路，其可切换地耦合到无论哪个收发器是备份。 RF环回测试电路监视备用收发器的操作能力，并提供其功能的指示。 如果备用收发器有缺陷，则可以在主收发器的潜在操作故障之前采取纠正措施。 只要RF环回测试电路指示备用收发器的正常操作能力，可以立即切换冗余收发器来代替主收发器。
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公开(公告)号：US5732124A
公开(公告)日：1998-03-24
申请号：US577582
申请日：1995-12-22
CPC分类号： H04B14/04
摘要： An apparatus and method are provided for determining the activity status of a PCM channel in a telecommunications system. The method (600-680) and apparatus (400) utilize a codec (220) within the PCM channel which converts an analog signal to a digital signal and converts a digital signal to an analog signal. Within the apparatus (400), a memory register (402) is coupleable to the codec (220) to repeatedly obtain and store a digital byte of a plurality of digital bytes from the PCM channel. A processor (404) coupled to or containing the memory register (402) repeatedly, for a predetermined period of time, determine whether an ordered arrangement of bits of a digital byte has a predetermined bit pattern and accumulate a count of digital bytes having the predetermined bit pattern. The processor (404) then determines whether the accumulated count is greater than a predetermined value and provides a notification indicating the status of the PCM channel.
摘要翻译： 提供了一种用于确定电信系统中PCM信道的活动状态的装置和方法。 方法（600-680）和装置（400）利用PCM通道内的编解码器（220），其将模拟信号转换为数字信号，并将数字信号转换为模拟信号。 在装置（400）内，存储器寄存器（402）可耦合到编解码器（220）以重复获得并存储来自PCM信道的多个数字字节的数字字节。 在预定时间段内重复地耦合或存储存储器寄存器（402）的处理器（404）确定数字字节的有序排列是否具有预定位模式，并且累积具有预定位数的数字字节计数 位模式。 处理器（404）然后确定累加计数是否大于预定值，并提供指示PCM信道的状态的通知。
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公开(公告)号：US06965756B2
公开(公告)日：2005-11-15
申请号：US09971522
申请日：2001-10-05
摘要： An RF loopback test circuit is adapted to be coupled to an antenna port of a digital radio, to determine whether the radio is functioning properly. A frequency generator outputs an auxiliary frequency corresponding to the sum or difference between the radio's transmit and receive frequencies. The auxiliary frequency is coupled to a Schottky diode mixer, which is also coupled to the input/output port. If the radio's transceiver section is operating properly, the sum or difference frequency output of the Schottky diode mixer will be passed by only the diplexer's narrowband receive path filter to the radio's receiver section. The mixer's sum frequency is blocked by the diplexer's narrowband filters. Therefore, if the receiver section provides an indication that it is receiving a sufficient signal level from the RF loopback test circuit, it can also be inferred that each of the transmitter and receiver sections is operating properly.
摘要翻译： RF环回测试电路适于耦合到数字无线电的天线端口，以确定无线电是否正常工作。 频率发生器输出对应于无线电发射和接收频率之间的和或差的辅助频率。 辅助频率耦合到也耦合到输入/输出端口的肖特基二极管混频器。 如果无线电收发器部分工作正常，肖特基二极管混频器的总和或差分频率输出将仅由双工器的窄带接收路径滤波器传递到无线电接收器部分。 混频器的和频被双工器的窄带滤波器阻挡。 因此，如果接收机部分提供其从RF环回测试电路接收到足够的信号电平的指示，则还可以推断出发射机和接收机部分中的每一个都正常工作。
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4.发明授权Mechanism for automatically tuning transceiver frequency synthesizer to frequency of transmit/receiver filter 有权收发器频率合成器自动调谐到发射/接收滤波器频率的机制公开(公告)号：US06178312B1
公开(公告)日：2001-01-23
申请号：US09232453
申请日：1999-01-15
申请人： David Paul Nelson
发明人： David Paul Nelson
IPC分类号： H03C300
摘要： Frequency synthesizers of a radio transceiver are automatically tuned so that its transmit and receive frequencies correspond to whichever upper band and lower band filters the radio transceiver has been connected by the user. A capacitive electrical impedance interface is coupled to filter circuitry of an upper band filter section, while an inductive electrical impedance interface is coupled to filter circuitry of the lower based filter section. A voltage reference circuit is coupled to one of the transmit port and the receive port of the transceiver. A controller is operative to automatically tune the transceiver to transmit in one of the upper and lower frequency bands, and to receive on the other frequency band, in accordance with the voltage level generated by the voltage reference circuit.
摘要翻译： 无线电收发器的频率合成器被自动调谐，使得其发射和接收频率对应于无线电收发器已由用户连接的较高频带和较低频带滤波器。 电容性电阻抗接口耦合到上带滤波器部分的滤波器电路，而感性电阻抗接口耦合到基于滤波器部分的滤波器部分的滤波器电路。 电压参考电路耦合到收发器的发送端口和接收端口之一。 控制器可操作以自动调谐收发器以在上和下频带中的一个频带进行发送，并根据由电压参考电路产生的电压电平在另一个频带上接收。
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公开(公告)号：US5661726A
公开(公告)日：1997-08-26
申请号：US559887
申请日：1995-11-20
CPC分类号： H04L12/403 , H04L12/28 , H04L12/4612 , H04L12/52 , H04Q11/0414 , H04L12/24 , H04L41/00
摘要： A communication system for coupling a plurality of data terminals to a telephone network has a time division multiplexed telephone network access bus, providing a plurality of time division slots containing data, coupled to the telephone network, and a digital terminal access bus coupled to the plurality of communication devices, each communication device being configurable to access any of the time division slots. A controller for configures each communication device to access a time division slot.
摘要翻译： 用于将多个数据终端耦合到电话网络的通信系统具有时分多路复用的电话网络接入总线，提供耦合到电话网络的包含数据的多个时分时隙以及耦合到多个数字终端的数字终端接入总线 的通信设备，每个通信设备可配置为访问任何时分时隙。 用于配置每个通信设备以访问时分时隙的控制器。
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