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1. 发明授权

US4805172A Time division multiplex (TDM) switching system especially for pulse code modulated (PCM) telephony signals 失效
标题翻译：时分复用（TDM）交换系统，特别适用于脉码调制（PCM）电话信号
公开(公告)号：US4805172A
公开(公告)日：1989-02-14
申请号：US36934
申请日：1987-04-10
申请人： Charles A. Barbe , Bruce G. Littlefield
发明人： Charles A. Barbe , Bruce G. Littlefield
IPC分类号： H04Q11/04 , H04J3/12
CPC分类号： H04Q11/0407
摘要： A TDM switching system for providing selected connections between large numbers of lines and trunks and which may combine, in an integrated system, several TDM switching systems which are adapted to handle smaller numbers of lines and trunks so as to expand the capacity of such smaller TDM systems. The system has a distributed, modular architecture in which the lines and trunks are arranged in a plurality of domains. The domains each have a link controller which links the domains to interdomain PCM highways. The domains each include, as the members thereof, a plurality of devices. These member devices can be port interfaces which connect telephone lines and trunks and convert the analog telephony signals into PCM signals and vice versa, circuits which provide services, telephony processors which contain the data base of the addresses (telephone numbers) of the various lines and trunks, ringing generators, and interface devices which provide a gateway for signals into the domains for the smaller TDM switching systems. Each domain has its own intradomain PCM highway to which the devices are connected and device control links connecting the devices to a link controller and carrying signalling messages. Each domain may have a different complement of devices. Control signals control the telephony signal process along separate links, unique to each device, which connect that device to the link controller.

2. 外观设计

USD275279S High density component mounting back panel for electronic equipment 失效
公开(公告)号：USD275279S
公开(公告)日：1984-08-28
申请号：US178641
申请日：1980-08-15
申请人： Bruce G. Littlefield , Jerome S. Caplan , Charles J. Breidenstein
设计人： Bruce G. Littlefield , Jerome S. Caplan , Charles J. Breidenstein

3. 发明授权

US4220823A Selectively controlled digital pad 失效
标题翻译：选择性控制的数字键盘
公开(公告)号：US4220823A
公开(公告)日：1980-09-02
申请号：US927067
申请日：1978-07-21
申请人： Bruce G. Littlefield
发明人： Bruce G. Littlefield
IPC分类号： H04M1/76 , H04Q11/04
CPC分类号： H04Q11/04
摘要： In a digital data transmission system including one or more matrix switches in which data in digital form is stored in a send memory during one selected time slot of a recurring time frame, transferred to a receive memory and sent out from the receive memory during another time slot of the recurring time frame to establish desired data paths through the switch between selected inputs and outputs, means is provided in the form of a programmable read only memory to control the insertion loss of each data path in a selective manner.
摘要翻译：在包括一个或多个矩阵开关的数字数据传输系统中，其中数字形式的数据在循环时间帧的一个选定时隙期间被存储在发送存储器中，被传送到接收存储器并且在另一时间期间从接收存储器发出重复的时间帧的时隙以通过选择的输入和输出之间的切换建立期望的数据路径，以可编程只读存储器的形式提供装置，以选择的方式控制每个数据路径的插入损耗。

4. 发明授权

US4524245A Ring trip detection system 失效
标题翻译：环路检测系统
公开(公告)号：US4524245A
公开(公告)日：1985-06-18
申请号：US457556
申请日：1983-01-13
申请人： Bruce G. Littlefield
发明人： Bruce G. Littlefield
IPC分类号： H04M3/06 , H04M19/02 , H04M3/02
CPC分类号： H04M19/026
摘要： Ring trip is detected when a telephone set which is being rung goes off-hook, through the use of a comparator in which the ringing signal superimposed on battery feed voltage is compared with a fixed reference voltage closer to ground than the battery feed voltage. Inasmuch as the duty cycle of the ringing signal with respect to the reference voltage is less than or equal to 50% under pre-trip (on-hook) conditions and will increase under trip (off-hook) conditions, the comparator output is a square wave form of corresponding duty cycle. An up-down counter is caused to count up when the comparator output wave form is of one level and down when the comparator output wave form is of another level during each cycle of the ringing signal. The counter counts up during the portion of the comparator wave form which determines the duty cycle and down during the rest of the period of the cycle. Underflow and lack of underflow states of the counter respectively indicate nonring trip and ring trip conditions. Logic responsive to these conditions causes deactuation of a ringing relay to enable disconnection of the ringing signal from the ring lead going from the line circuit to the telephone set. The line circuit has a calling bridge which provides an output which is used to prevent the ringing relay from reoperating unless the telephone set remains on-hook after ring trip detection.
摘要翻译：通过使用将电池馈电电压叠加的振铃信号与比电池供电电压更接近的固定参考电压进行比较，使用比较器检测正在梯级的电话机摘机时的环路跳闸。由于在跳闸（挂机）条件下振铃信号相对于参考电压的占空比小于或等于50％，并且在跳闸（摘机）条件下将增加，所以比较器输出为方波形式相应的占空比。当比较器输出波形在振铃信号的每个周期期间比较器输出波形为另一个电平时，当比较器输出波形为一个电平和下降时，引起递减计数器的计数。在比较器波形的部分期间，计数器向上计数，该周期的剩余时间期间确定占空比和下降。计数器下溢和欠流状态分别表示非跳闸和环路跳闸情况。响应于这些条件的逻辑导致振铃继电器的停用，以使得振铃信号能够与从线路电路到电话机的环形引线断开。线路电路具有一个呼叫桥，提供一个输出，用于防止振铃继电器重新操作，除非电话机在环路跳闸检测后保持挂机。

5. 发明授权

US4229816A Timing signal generation and distribution system for TDM telecommunications systems 失效
标题翻译： TDM电信系统的定时信号发生和分配系统
公开(公告)号：US4229816A
公开(公告)日：1980-10-21
申请号：US42743
申请日：1979-05-29
申请人： Charles J. Breidenstein , Jerome S. Caplan , Bruce G. Littlefield
发明人： Charles J. Breidenstein , Jerome S. Caplan , Bruce G. Littlefield
IPC分类号： H04J3/06
CPC分类号： H04J3/0685
摘要： Synchronous operation of any number of digital switching units of a TDM system is maintained by interconnecting the switching units to a timing signal highway which distributes timing signals generated by sources of such signals in any one of the units. The units are connected successively in a chain by timing signal distribution control lines. Validity signals are generated and transmitted by circuits in each unit along the lines so as to provide for transmission of timing signals generated in the first switching unit on to the timing signal highway and switch over of the timing signal generating function to successive ones of the units when the timing signal generation in preceding units becomes faulty.
摘要翻译：通过将切换单元互连到定时信号公路来维持TDM系统的任何数量的数字交换单元的同步操作，该定时信号公路将由这些信号的源产生的定时信号分配在任何一个单元中。这些单元通过定时信号分配控制线连续连接。有效信号沿着线路在每个单元中由电路产生和发送，以便提供在第一开关单元中产生的定时信号传输到定时信号公路并将定时信号产生功能切换到连续的单元当前一单元中的定时信号产生变得有故障时。

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