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1. 发明授权

US4063220A Multipoint data communication system with collision detection 失效
公开(公告)号：US4063220A
公开(公告)日：1977-12-13
申请号：US563741
申请日：1975-03-31
申请人： Robert M. Metcalfe , David R. Boggs , Charles P. Thacker , Butler W. Lampson
发明人： Robert M. Metcalfe , David R. Boggs , Charles P. Thacker , Butler W. Lampson
IPC分类号： G06F13/00 , G06F13/376 , H04L12/413 , H04L25/49 , H04Q9/00
CPC分类号： H04L25/4904 , G06F13/376 , H04L12/413
摘要： Apparatus for enabling communications between two or more data processing stations comprising a communication cable arranged in branched segments including taps distributed thereover. Tied to each tap is a transceiver which on the other side connects to an associated interface stage. Each transceiver includes, in addition to the usual transmitter and receiver sections, a gate which compares the data from the interface stage with the data on the cable and indicates whether such are equal. Should such be unequal, an interference between the transceiver and the cable is indicated, disabling the associated transmitter section. Each interface stage tied to such transceiver also includes an input and an output buffer on the other end thereof interfacing with a using device, such input and output buffers storing both the incoming and outgoing data. The output buffer is connected to a clock-driven shift register which converts the buffered data to a serial stream, feeds such data to a phase encoder, which then connects to the transmitter or driver section of the transceiver. The input buffer is loaded by an input shift register which derives its clock from a phase decoder, the shift register and the phase decoder both connecting to the receiver section. When the station is to start transmitting, the phase decoder detects the presence of other transmissions on the cable and detains the output shift register until no other transmissions are sensed. Once a transmission has begun, if interference is detected and the transmitter section is disabled, a random number generator is used to select an interval of time at the completion of which the next attempted transmission will take place. Concurrently, a counter counts the number of interferences, or collisions, which recur in the attempted transmissions of one data packet and weights the mean of the random number generator accordingly. The input shift register is also connected to an address decoder which enables data transfer to the input buffer only during those times when the data is preceded by an appropriate address.

2. 发明授权

US4099024A Communications network repeater 失效
标题翻译：通信网络中继器
公开(公告)号：US4099024A
公开(公告)日：1978-07-04
申请号：US769141
申请日：1977-02-16
申请人： David R. Boggs , Robert M. Metcalfe
发明人： David R. Boggs , Robert M. Metcalfe
IPC分类号： H04L12/28 , H04L12/46 , H04L25/20 , H04L25/40
CPC分类号： H04L25/20 , H04L12/28 , H04L12/46
摘要： A repeater is provided for use in a communications network which includes a plurality of transceivers, the repeater being bidirectional and allowing the interconnection of two segments of the network and also allowing longer communications networks to be used by matching or amplifying the signal level of an incoming information packet on one segment and coupling the matched or amplified signal to a succeeding segment. The repeater has two ports that preferably utilize two semiconductor chips, each port having a carrier one-shot which detects the presence of an information packet arriving at that port. If an incoming port's one-shot is triggered by an incoming packet of information, the carrier one-shot for the repeating port and the incoming port transmitter are disabled. If the transceiver coupled to the repeating port detects a collision, this information is fed back to the incoming port which enables the incoming port transmitter thereby causing a collision on the incoming network segment which causes the termination of the transmission of the data packet by a using device already transmitting.

3. 发明授权

US4282512A Data communication system 失效
标题翻译：数据通信系统
公开(公告)号：US4282512A
公开(公告)日：1981-08-04
申请号：US118135
申请日：1980-02-04
申请人： David R. Boggs , Robert M. Metcalfe
发明人： David R. Boggs , Robert M. Metcalfe
IPC分类号： H04B1/44 , H04L25/49 , H04Q9/00
CPC分类号： H04L25/4904
摘要： A data communication system includes a communicating medium and a plurality of transceivers connected to the medium, each including a transmitter for transmitting phase-encoded data onto the medium and a receiver for receiving phase-encoded data communicated on the medium by another transceiver. A digital phase decoder is coupled to the receiver of each transceiver for decoding the data received and applying at its output a decode signal representative of the character of the received data. The decode signal is at a predetermined value whenever data communicated on the medium by another transceiver is received by the subject receiver during the time the subject transmitter is transmitting data onto the medium. Circuitry is included for interrupting the transmission of data whenever the decode signal is detected to be at said predetermined value.
摘要翻译：数据通信系统包括通信介质和连接到介质的多个收发器，每个收发器包括用于在介质上传送相位编码数据的发射机和用于接收由另一收发器在介质上传送的相位编码数据的接收机。数字相位解码器耦合到每个收发器的接收器，用于对接收到的数据进行解码，并在其输出端应用代表接收数据的字符的解码信号。当对象发射机在媒体上传送数据的时间期间，无论目标接收机是否接收到由另一收发器在介质上传送的数据，解码信号都处于预定值。每当检测到解码信号处于所述预定值时，包括用于中断数据传输的电路。

4. 发明授权

US4233589A Active T-coupler for fiber optic local networks which permits collision detection 失效
标题翻译：用于光纤局域网的有源T型耦合器，允许进行碰撞检测
公开(公告)号：US4233589A
公开(公告)日：1980-11-11
申请号：US43391
申请日：1979-05-25
申请人： Eric G. Rawson , Robert M. Metcalfe
发明人： Eric G. Rawson , Robert M. Metcalfe
IPC分类号： H04B10/29 , H04L12/413 , H04Q9/00 , H04B9/00
CPC分类号： H04B10/29 , H04L12/413
摘要： An active T-coupler for fiber optic local networks which permits collision detection wherein two input 36, 44 optical fibers are coupled to photodetectors 360, 440, respectively. Two output 34, 46 optical fibers are coupled to receive light from light sources 340, 460. Driving sources 340, 460 are gate circuits 342, 462, which function in a manner similar to an OR gate, via driver circuits 341, 461. These OR gates receive electrical signals from the host station or an input light fiber detector. Further, the input detectors 360, 440 provide electrical signals to the driving OR gates 342, 462 to pass the signal on, i.e. repeat, or drive OR gate 370 to transmit the signal to the host station. Thus the coupler can act as an optical repeater or transmit originally generated light signals in either the forward or reverse directions. Further, the host station can monitor the electrical signals from the input detectors to detect the occurrence of a data collision while transmitting and thereby react appropriately.
摘要翻译：用于光纤局部网络的有源T耦合器允许碰撞检测，其中两个输入端36,44光纤分别耦合到光电检测器360,440。两个输出34,46光纤被耦合以接收来自光源340,460的光。驱动源340,460是通过驱动器电路341,461以类似于或门的方式起作用的门电路342,462。这些或门从主站或输入光纤检测器接收电信号。此外，输入检测器360,440向驱动或门342,462提供电信号以传递信号，即重复或驱动或门370，以将信号传送到主机站。因此，耦合器可以用作光中继器或者在正向或反向方向上发送原始产生的光信号。此外，主机可以监视来自输入检测器的电信号，以便在发送时检测数据冲突的发生，从而适当地进行反应。

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