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Topic: Duplex communication

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Simplex communication

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	What is duplex? - a definition from Whatis.com - see also: simplex
		- In telecommunication, duplex communication means that both ends of the communication can send and receive signals at the same time.
		Simplex communication means that communication can only flow in one direction and never flow back the other way.
		An ordinary telephone conversation is a duplex communication.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci212017,00.html (298 words)

	Encyclopedia: Duplex Communication
		Telecommunications stubs A Communications channel (or channel for short), models the medium through which information is transmitted from a sender (or transmitter) to a receiver.
		In telecommunication, duplex communication means that both ends of the communication can send and receive signal s at the same time.
		An ordinary telephone conversation is a duplex communication.
	www.nationmaster.com /encyclopedia/Duplex-Communication (552 words)

	Duplex communication - Encyclopedia, History, Geography and Biography
		It has been suggested that this article or section be merged with duplex (telecommunications).
		A duplex communication system is one where signal can flow in both directions between connected parties.
		These systems are employed in nearly all communications networks, either to allow for a "two-way street" between connected parties or to provide a "reverse path" for the monitoring and remote adjustment of equipment in the field.
	www.arikah.net /encyclopedia/Duplex_Communication (264 words)

	United States Patent Application: 0040141483
		Communications transmitted from a base station 30.sub.1 to a UE 32.sub.1 are referred to as downlink communications and communications transmitted from a UE 32.sub.1 to a base station 30.sub.1 are referred to as uplink communications.
		For instance, if communications sent between a UE and a base station are in a highly dynamic environment, such as due to the UE moving, such systems may not be able to adapt fast enough to compensate for the changes.
		The communication burst is subsequently amplified by an amplifier 60.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040141483".PGNR.&OS=DN/20040141483&RS=DN/20040141483 (4240 words)

	[No title] (Site not responding. Last check: 2007-10-10)
		In describing communications between two devices, the term 'message' is used to denote a communication from a source device to a destination device.
		In a half-duplex communication system which utilizes a timing and synchronization scheme to avoid message collision, a source device desiring to communicate with a destination device on the same channel initiates the communication by sending out a message and waiting for a response from the destination device.
		Communications between fax machine 50 and the peer fax machine are stored in buffer 46 if immediate transmission of the messages is not possible because of potential for message collisions or other system considerations.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=98/31139.980716&ELEMENT_SET=DECL (4123 words)

	Duplex communication transceiver with modulation cancellation - Patent 4520475
		A duplex communication transceiver according to claim 1 wherein said local oscillator includes a varactor diode which receives said modulating related signal having its phase adjusted and which provides a variable capacitance in response thereto so as to frequency modulate said local oscillator to provide said modulated local oscillator carrier signal.
		A duplex communication transceiver according to claim 1 wherein said transmitter means includes an oscillator for receiving said first information signal and FM modulating said first carrier signal to provide said output signal to be transmitted.
		The operation of the duplexer 27 is well known to those of average skill in the art and essentially comprises enabling the transmitter and receiver portions of the transceiver 10 to simultaneously utilize the antenna 28 without substantial interference.
	www.freepatentsonline.com /4520475.html (3907 words)

	Duplex microphone communication system - Patent 4691349
		decoder means, coupled to the second end of the communications channel, for decoding the common-mode signal to recover the talkback signal and for simultaneously coupling a differential microphone signal across the two center conductors of the communications channel for transmission to the first end thereof.
		At the other end of the communications channel is a decoder for decoding the common-mode signal to recover the desired signal and for simultaneously coupling a microphone signal through the two conductors of the communications channel for transmission to the first end.
		For example, two way communications with a remotely located announcer in broadcast settings or simplified wiring of simultaneous translation systems in which the dialogue to be translated can be transmitted to the translator on the same microphone cable that is used for the translated material.
	www.freepatentsonline.com /4691349.html (2911 words)

	Duplex (telecommunications) - Wikipedia, the free encyclopedia
		It has been suggested that this article or section be merged with Duplex communication.
		In point to multipoint networks such as cellular networks, both TDD and FDD are used in communication between the base station and the mobile transmitter.
		Time division duplex has a strong advantage in the case where the asymmetry of the uplink and downlink data speed is variable.
	en.wikipedia.org /wiki/Duplex_(telecommunications) (366 words)

	Radio Technology
		In simplex communication, there is a one-way communication between the sender or transmitter and the receiver.
		The third form of radio communication after simplex and duplex communication is half duplex communication.
		In half duplex communication, two-way communication is possible, but simultaneous two-way transmission is not possible.
	cbdd.wsu.edu /kewlcontent/cdoutput/TR502/page45.htm (321 words)

	Zipper VDSL: A Solution for Robust Duplex Communication over Telephone Lines
		A duplex scheme is a method to divide the capacity of a line between the upstream and downstream directions.
		An important property of a duplex method is its ability to achieve a fair distribution of high data rates for all loops in a cable binder.
		The Zipper duplexing technique represents a form of FDD whereby different frequency bands are solely allocated to either the downstream or upstream direction of transmission.
	www.comsoc.org /ci1/private/2000/may/Odling.html (4846 words)

	Introduction To RS232 Serial Communication
		Serial communication is basically the transmission or reception of data one bit at a time.
		Full duplex communication means that a device can receive and transmit data at the same time.
		Half duplex communication is all but outdated except for a very small focused set of applications.
	www.wcscnet.com /Tutorials/SerialComm/Page1.htm (1108 words)

	[No title] (Site not responding. Last check: 2007-10-10)
		The state machine 320 is instantiated on the full-duplex unit 270 on a per address basis, meaning that for each half-duplex unit communicating with the full-duplex unit 270, a separate, independent state machine, as well as corresponding transmit queues and timeout timers are provided.
		If while in state 2 a downlink packet becomes available at the full- duplex unit 270 for transmission to the half-duplex unit 272, it is queued in the transmit queue 276 and the Packet (s) Available signal is asserted by the LLC layer and saved for future use in state 0.
		The radio communication system of claim 3, further comprising: a transmitting unit, selected from the half-duplex and full-duplex units, configured to hold off transmission of at least one of the sequence of frames in response to receiving the acknowledge frame having the hold flag set to indicate the subsequent transmission of a sequence of frames.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/05630.030116&ELEMENT_SET=DECL (5664 words)

	RFC 596 (rfc596) - Second thoughts on Telnet Go-Ahead
		The purpose of this RFC is to advocate either complete removal of the GA mechanism or relegating it to the status of a negotiated option whose default state is that it be suppressed.
		TERMINOLOGY "Half-duplex" is a two-way communication discipline in which transmission takes place in only one direction at a time and the receiving party is constrained not to transmit until the transmitting party has explicitly given up control of the communication path ("turned the line around").
		Given the trend toward more interactive communication, and given the fact that terminals on the Network requiring a Go-Ahead mechanism are a distinct minority of all terminals, I think we should be reluctant to burden our protocols with kludges that are so clearly a concession to obsolete design.
	www.faqs.org /rfcs/rfc596.html (1619 words)

	Communication and Computer Network
		Communication Satellite: The problem of line-sight and repeaters are overcome by using satellites which are the most widely used data transmission media in modern days.
		In satellite communication, microwave signal is transmitted from a transmitter on earth to the satellite at space.
		The main advantage of satellite communication is that it is a single microwave relay station visible from any point of a very large area.
	www.nos.org /htm/funda4.htm (3106 words)

	FAQ: What does half and full duplex mean? (Site not responding. Last check: 2007-10-10)
		Half-duplex is a mode of communication where at any given moment data can be either transmitted or received but cannot be transmitted and received simultaneously.The simplest example of half-duplex communications is using a walkie-talkie: you have to press a button to talk and release the button to listen.
		Communication through traditional hub-based Ethernet networks is another example of half-duplex communications.
		However, full- duplex requires two communication channels to achieve these results-one to transmit and one to receive signals.
	www.modicon.com /05256DE2005769E3/all/BA4114C30797DE9F85256F10004A57E3!OpenDocument (205 words)

	Synchronization method and synchronization recovery devices for half-duplex communication - Patent 5046074
		The main object of this invention is to provide a synchronization method and synchronization recovery devices intended for half-duplex communication, taking advantage of a particular waveform of the half-duplex communication signals, to introduce into said signals very long synchronization words from which synchronization recovery is obtained very quickly and with good reliability.
		Accordingly, the invention relates to a synchronization method wherein a communication signal is transmitted from a first end of a half-duplex bidirectional link and received at a second end of the link.
		In a transmitting-receiving end equipment in a half-duplex link, a synchronization recovery device embodying the invention is situated after a duplexing device having a bidirectional port connected to the transmission support of the link, such as an optical fiber, for half-duplex transmitting and receiving digital signals such as e.g.
	www.freepatentsonline.com /5046074.html (2552 words)

	Appendix B: IBM Serial Link Implementation Notes
		Duplex, as seen on asynchronous communication lines (and in terminal emulation software parameters), implies full duplex as it applies to the echoing of transmitted characters by a host back to a terminal.
		Full duplex specified on a terminal when the host is set for half duplex results in typing blind at the terminal.
		Half duplex specified on a terminal when the host is set for full duplex results in double characters on the terminal.
	www.cisco.com /univercd/cc/td/doc/cisintwk/idg4/nd20b.htm (993 words)

	Brain.Save() - Duplex vs. Request-Response (Site not responding. Last check: 2007-10-10)
		The biggest thing that stood out to me was the idea of duplex communication as a new messaging pattern in addition to one-way and request/response.
		Duplex messaging requires apps to formulate their own strategies for response correlation, but gives the benefits of higher throughput and greater flexibility over request/response.
		I think the key to harnessing the power of duplex messaging is to free yourself from the last vestiges of the synchronous client/server mindset and start thinking about solutions as a set of peers that communicate asynchronously.
	hyperthink.net /blog/CommentView,guid,97b52cfb-2863-4e8f-a604-706eb07d63b8.aspx (935 words)

	World War 1 and 2 - Duplex Communication
		A half duplex system allows communications in both directions, but only one direction at a time (not simultaneously).
		A good analogy for a half duplex system would be a one lane road with traffic controllers at each end.
		A good analogy for a full duplex system would be a two lane road with one lane for each direction.
	www.worldwardiary.com /history/Duplex_Communication (218 words)

	Duplex Services
		A duplex service contract is a message exchange pattern in which both endpoints can send messages to the other independently.
		Duplex communication occurs when a client connects to a service and provides the service with a channel on which the service can send messages back to the client.
		The WCF client that is generated for a duplex contract requires a InstanceContext to be provided upon construction.
	msdn2.microsoft.com /en-us/library/ms731064.aspx (702 words)

	Cordless telephone system - Patent 4039760
		In a duplex communication link such as provided in the present invention for a cordless telephone system, one of the main difficulties is in providing for two-way transmission with sufficient selectivity in the receivers to reject transmission from adjacent, co-located transmitters.
		In order to overcome the difficulties of the prior art telephone duplex communication systems, the present invention provides narrow bandpass filtering to enable closely adjacent, co-located transmitters and receivers to operate within a narrow frequency band, and preferably all transmission of the duplex link is totally within the citizens band.
		However, in the present invention the duplex transmission frequencies are both located in the citizens band where sufficient power is permitted by Federal regulations to achieve the desired range for the duplex link while avoiding the problem of interference.
	www.freepatentsonline.com /4039760.html (6538 words)

	Intel® Express 10 Switch - Definition of Full Duplex, Half Duplex, and Auto-Negotiation Modes
		NOTE: To use full-duplex communication, both ends of the connection must be configured to operate in full-duplex mode, and the connecting device must have a full-duplex adapter installed.
		Auto duplex negotiates whether the attached device is transmitting in half- or full-duplex, and then automatically changes that port to that mode.
		Normally you would need to configure the port on the switch with a specific speed or duplex mode, but that is not required with auto-negotiation; it detects the capabilities of the other devices (over a common link) and configures itself to use the same technology automatically; this gives maximum efficiency.
	support.intel.com /support/express/switches/10/sb/cs-014346.htm (666 words)

	RS-232 Laser Transceiver
		For full-duplex communication 2 transceivers and 2 lasers will be required, and for half-duplex communication a single laser, a transmitter and a transceiver is needed.
		Because this is an entry level circuit, costs have been kept to a minimum around $20 for the transceiver and approximately $10 for the transmitter (excluding the laser pointer).
		This offers secure communication since any attempts to intercept the laser beam would be detected at the receiver as a loss in data.
	www.geocities.com /SiliconValley/Lakes/7156/laser.htm (2703 words)

	Introduction to Interprocess Communication Using Named Pipes
		Because named pipes have the pathname of a file associated with them, it is possible for unrelated processes to communicate with each other; in other words, two unrelated processes can open the file associated with the named pipe and begin communication.
		In order to communicate by means of a named pipe, the processes have to open the file associated with the named pipe.
		It contains the definition of the named pipe that is used to communicate between the client and the server.
	developers.sun.com /solaris/articles/named_pipes.html (2005 words)

	Duplex - The best properties products, sites and information on the web today! (Site not responding. Last check: 2007-10-10)
		In telecommunication, duplex communication means that both ends of the communication can send and receive signals at the...
		DUPLEX - Prototypage plastique - Prototype plastique prototypage piece moulage resine piÃ¨ce rÃ©sine coulee sous vide DUPLEX Duplex Prototypage plastique 22A, chemin de l'EspÃ©rance -...
		Duplex, meaning double or twofold, may refer to: Duplex, a telecommunications term referring to two-way simultaneous transmission and reception.
	properties.betterwebdir.com /index.php?k=duplex (1161 words)

	(WO 01/10159) SYSTEM AND METHOD FOR PERFORMING SOFT HANDOFF BETWEEN FREQUENCY DIVISION DUPLEX AND TIME DIVISION DUPLEX ... (Site not responding. Last check: 2007-10-10)
		A communication handoff is initiated from the current communication system to the targeted communication system when the mobile unit recognizes a predetermined threshold level of the pilot search signal.
		Concurrent communications are synchronized and temporarily maintained between the mobile unit and both the current and targeted communications systems using an increased data rate for each of the communications links.
		When the handoff is complete, transmission between the mobile unit and the current communication system is terminated, while communication between the mobile unit and the targeted communication system is maintained when the handoff is complete.
	wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/10159.010208&... (290 words)

	Station-to-station full duplex communication in a communications network (EP0422914B1)
		The present invention provides a method and apparatus for establishing point-to-point full duplex communication between two stations served by a local area network (LAN) or connected by a communication link.
		The request message indicates that a first station is available for full duplex communication and also serves as a test to determine whether any non-full duplex devices are present along the point-to-point link between the first station and a second station.
		In a communications network (1) which is capable of supporting both monodirectional, half-duplex communication and simultaneous, bidirectional, full duplex communication, a method for establishing full duplex communication between two stations (16,18), which are served by said network, said method comprising the steps of:
	www.delphion.com /details?pn=EP00422914B1 (372 words)

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