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Topic: Half duplex operation

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	Full Duplex Ethernet (Site not responding. Last check: 2007-10-03)
		In full duplex operation, both partners in the conversation can transmit at the same time without scrambling one another's signals.
		This is the essence of half duplex operation.
		Half duplex operation leads to chaos if one side begins to transmit and refuses to stop.
	cwx.prenhall.com /bookbind/pubbooks/panko/chapter5/medialib/C5FULL.HTM (274 words)

	* Duplex - (Telecom): Definition (Site not responding. Last check: 2007-10-03)
		The wireless technique where one frequency band is used for traffic from the network to the subscriber (the downlink) and another, widely separated, band is used for traffic from the subscriber to the network (the uplink)...
		This mode is known as full duplex, and requires that the transmitter and receiver operate on substantially...
		An example of half-duplex operation is a radio conversation between two people using simple walkie-talkies...
	www.bestknows.com /telecom/duplex.html (389 words)

	Half-duplex or full-duplex automode operation for use in data communications equipment - Patent 5349635
		The method of claim 1 wherein the full-duplex mode is a V.32 mode of operation and the first frequency is 2100 Hz, and the half-duplex mode is a 208B mode of operation and the second frequency is 2021 Hz.
		The method of claim 3 wherein the full-duplex mode is a V.32 mode of operation and the first narrow frequency band includes 2100 Hz, and the half-duplex mode is a 208B mode of operation and the second narrow frequency band includes 2021 Hz.
		However, the particular mode of operation of this modem is determined by the adjustment of a hardware swap.
	www.freepatentsonline.com /5349635.html (4611 words)

	Port Configuration
		In Auto mode the port automatically selects the network speed and the data transfer operation (full- or half-duplex) between itself and the device to which it is connected.
		In Auto mode for gigabit fiber optic ports, the port operates at 1000FDx and auto-negotiates flow control with the device connected to the port.
		The Gigabit Stacking Transceiver operates only in Auto mode, and auto-negotiates flow control if flow control is enabled for the port.
	www.hp.com /rnd/device_help/help/hpwnd/webhelp/HPJ4865A/configuration_ports.htm (422 words)

	Documentation
		Use this command to configure the speed and duplex mode of a given interface when auto-negotiation is disabled.
		To force operation to the speed and duplex mode specified in a speed-duplex command, use the no negotiation command to disable auto-negotiation on the selected interface.
		To force operation to the specified flowcontrol mode (i.e., on or off), use the no negotiation command to disable auto-negotiation on the selected interface.
	support.dell.com /support/edocs/network/5p788/CLIG/interfac.htm (1183 words)

	SpeedGuide.net Broadband Community - full or half duplex
		Half Duplex operation requires that each computer contend for the same piece of wire as all nodes connected to it.
		Full Duplex operation allows for seperate send/recieve wires between source and destination, basically creating a virtual circuit with no contention.
		If you set the NIC that is attached to the modem at 100MB Full Duplex you won't even be able to connect to the internet or it will be extremely slow and unstable.
	forums.speedguide.net /showthread.php?t=22779 (432 words)

	The TCP/IP Guide - Simplex, Full-Duplex and Half-Duplex Operation
		Simplex operation is also used in special types of technologies, especially ones that are asymmetric.
		Technologies that employ half-duplex operation are capable of sending information in both directions between two nodes, but only one direction or the other can be utilized at a time.
		In full-duplex operation, a connection between two devices is capable of sending data in both directions simultaneously.
	www.tcpipguide.com /free/t_SimplexFullDuplexandHalfDuplexOperation.htm (670 words)

	Modify Port
		Port automatically selects the network speed (100Mbps or 10Mbps) and the data transfer operation (full- or half-duplex) between itself and the device to which it is connected.
		Port operates at 100 Mbps and negotiates with the port at the other end for other port operation features.
		Port operates at 1000 Mbps and negotiates with the port at the other end for other port operation features.
	www.hp.com /rnd/device_help/help/hpwnd/webhelp/HPJ4819A/configuration_portsmodify.htm (333 words)

	The Allayer AL105: 5-Port Low Cost Fast Ethernet Switch
		The operation mode is auto-negotiated by the PHY.
		During transmission, the data is obtained from the buffer memory and routed to the destination port.
		For half duplex operation, in the event of a collision, the MAC control will back off and retransmit in accordance to the IEEE 802.3 specification.
	www.amslink.com /allayer99/al105dat.html (438 words)

	AICS Research, Inc., University Park, NM 88003
		MOTIVATION FOR THE OPTION Telnet is a protocol that may be operated in either a peer-to-peer, fully symmetric mode, or asymmetrically, in a host-terminal mode.
		If the remote client NVT terminal is operating in full-duplex mode, the receipt of DO and DONT SLE commands would have no meaning and therefore must have no effect.
		Full-duplex communication requires a round-trip circuit for each packet sent from the client NVT terminal to the host computer and back again before those characters are displayed on the terminal's screen, thus perceived transit times that are many times that of half-duplex communications.
	www.aics-research.com /qcterm/telnet.html (1435 words)

	Frame Bursting: A Technique for Scaling CSMA/CD to Gigabit Speeds
		The parameters for half-duplex operation were chosen to align with the requirements of current generic building cabling standards, rather than to match the natural way that network size scales inversely with speed, so a star-wired single repeater topology with a maximum diameter of 200 m is permitted.
		Adding 1.5k-frame bursting lets us recover almost half this loss, raising the maximum throughput from 61 to 72 percent, which is very close to the 20 percent reduction in overhead we were hoping for.
		Furthermore, there is little incentive to develop a new "large-diameter" operating mode for the existing speeds: because of the trend toward network segmentation for other reasons (management, control of broadcasts, etc.), a 200-m collision domain diameter is enough.
	www.comsoc.org /ni/private/1997/jul/Molle.html (8317 words)

	Troubleshooting Ethernet
		For half-duplex operation, the mode on which traditional Ethernet is based, the size of your collision domain can be limited by the physical limitations of the cabling utilized.
		Because the 64-byte slot time is consistent for 10/100/1000 transmission speeds, this severely limits the scalability for 1000BaseX to operate in a network with a diameter of more than 20 meters.
		Now, having said all that regarding the regular operation of traditional Ethernet and 802.3, we must discuss where the two separate in features and functionality.
	www.cisco.com /univercd/cc/td/doc/cisintwk/itg_v1/tr1904.htm (4136 words)

	MuLogic UDM-288 Voiceband modem
		During dial-up line operation the UDM-288.3 continuously tests the leased line by means of an interactive V.19 type of data exchange.
		The restoral operation of the UDM-288.3 can be enabled under control of a real-time clock in order to prevent unnecessary telephone connection costs at times when the modem connection is not in use.
		Simulated switched carrier operation is supported for applications where the DTE requires a half-duplex V.24 control.
	www.mulogic.com /udm-288.html (1863 words)

	lan_config(8)
		The lan_config command allows you to modify the type of medium, speed, and mode of operation (half- or full-duplex).
		Autonegotiation is a hardware and software (driver) process that allows determination of the highest common speed and duplex (half or full) configuration.
		To switch from aui or bnc to utp full-duplex operation on tu0, enter: lan_config -i tu0 -m utp -x 1 2.
	h30097.www3.hp.com /docs/base_doc/DOCUMENTATION/V40E_HTML/MAN/MAN8/0162____.HTM (531 words)

	CobraNet White Paper: Media Converters (Site not responding. Last check: 2007-10-03)
		This paper will discuss the basic concepts of operation for 10Mbit, 100Mbit and 10/100Mbit network devices, explain the concept of auto-negotiation, and present design scenarios using different combinations of devices.
		The previous connection examples are very straightforward once the operation of basic network devices is understood.
		For this design to function properly, the switch port must be manually configured for half-duplex operation and the cable distance between the switch and the CobraNet device must not exceed 200 meters.
	www.peakaudio.com /CobraNet/licensee/MediaConverters.html (1350 words)

	Dial-up line modem for industrial applications DLM-336
		The DLM-336 supports half duplex (switched carrier) operation in V.23 mode and offers a buffered interface which enables the DTE to operate at a higher rate than the modem.
		This can be used for connecting DTEs that expect a half duplex modem while offering the benefits of the higher data rates as supported by the V.34 modulation mode.
		It is suitable for operating at ambient temperatures ranging from -25 to +70 C
	www.mulogic.com /dlm-336.html (573 words)

	CNet USA, Thirty-two (32) Port 10/100Mbps Fast Ethernet N-Way Switch w/fiber port (SC type connector)
		Each port is further equipped with a built-in N-Way Auto-Negotiation function that automatically sets the port to operate at that speed.
		Front panel LEDs are provided on the front panel of each model for real time viewing of switch and network operations.
		Operating Temperature: 0° ~ 45° C (32° ~ 113° F)
	www.cnetusa.com /product/specs/switch_cnsh3201.htm (351 words)

	[vortex] duplex problems with 3c905 (Site not responding. Last check: 2007-10-03)
		I posted to this list on Mon, 17 Sep, with some duplex problems I was having: I now have some more info available.
		In this configuration, the speed was 1.5 Mbit/s, with the switch reporting half duplex operation with plenty of collisions.
		Unfortunately, I don't have ready access to the other end of this connection; my understanding is that it only does 10 Mbit half duplex, so this shouldn't be a problem.
	www.beowulf.org /pipermail/vortex/2001-October/001400.html (403 words)

	ES Series 10BaseT/100BaseTX/100BaseFX Switches
		Each 1RJ45 port can operate without regard to the other ports at 10 or 100 Mega bits per second (Mbps) and 20 or 200 in full duplex mode.
		The auto-negotiation feature, allows the switches to recognize the speed of the network adapter card that it is connected to, and self configure itself, to that speed.
		Operating Temperature: 32 to 122F (0 to 50 C) Storage Temperature: -4 to 140F (-20 to 60 C) Relative Humidity: 5% to 80% (non-condensing)
	www.ethercom.com /es6t2f.html (409 words)

	2.2 Gigabit Ethernet Technology
		When Gigabit Ethernet operates in full duplex mode, it uses buffers to store incoming and outgoing data frames until the MAC layer has time to pass them higher up the legacy protocol stacks.
		Half-duplex operation is intended for shared multistation LANs, where two or more end nodes share a single port.
		Most switches enable users to select half-duplex or full-duplex operation on a port-by-port basis, allowing users to migrate from shared links to point-to-point, full-duplex links when they are ready.
	www.usenix.org /publications/library/proceedings/als00/2000papers/papers/full_papers/ong/ong_html/node5.html (899 words)

	[No title]
		For Half Duplex operation, set the Flow control to RTS and configure the RS485 adapter to use this pin to enable/disable the transmit driver.
		The X-modem protocol operates in the standard mode with 128 byte packets and a modulo two checksum, as originally created by Ward Christensen in his ancient Modem2 program circa 1979, some time before the dinosaurs; as well as the slightly more recent extentions for CRC16 error detection and 1 kilobyte packets, a.k.a.
		There is little difference in the operation of the program, whether it is registered or non-registered, The unregistered version put small nag messages on screen and in the log files and the registered version will save the last 10 messages sent and retrieve them the next time you run the program, which is handy.
	www.aerospacesoftware.com /winhexcom.html (4852 words)

	QSP-200/300 - Four Port RS-422/485 Serial Card (Site not responding. Last check: 2007-10-03)
		The RS-422/485 serial ports can be configured to operate in either Full-Duplex or Half-Duplex mode (but all ports must operate in the same mode).
		The default is Full-Duplex operation with the RS-422/485 output drivers always enabled.
		Half Duplex mode may be selected via software configuration.
	www.superlogics.com /specpage.asp?Items=9715 (425 words)

	kbAlertz: (160884) - APPC is a peer-oriented program-to-program API where either Transaction Program (TP) can initiate ...
		Under half-duplex operation, once the converation is established, only one TP has direction to send on a conversation at a time.
		The state of the conversation, as viewed by a particular TP, governs which APPC verbs can be issued by the TP at a particular time.
		IBM now supports "full duplex" APPC where either program can issue both send and receive verbs at the same time, as well as non-blocking APPC operation, which are relatively new APPC option sets defined by IBM.
	www.kbalertz.com /kb_160884.aspx (631 words)

	Fusion Developer's Manual (6752-13): Utilities
		Indicates whether the connection is running Full Duplex or Half Duplex.
		In half duplex operation, it is possible to have errors of various types.
		Connects directly to the Ethernet PPE, and transmits all outbound RTP packets to the IP network (half duplex).
	www.nmscommunications.com /manuals/6752-13/appa1.htm (1572 words)

	CTRLink EIMC Miniature Media Converters
		If the application requires that an EIMC mate up with an existing fiber hub or switch; then it is best that the proper EIMC model be selected to match the data rate and fiber wavelength of the fiber port partner.
		Select half- or full-duplex operation accordingly and verify that the data rates on the copper and fiber end devices are the same.
		All units mount on TS-32 or TS-35 DIN-rail; operate from wide-range, low-voltage AC or DC power sources and have provisions for redundant power connections.
	www.ctrlink.com /eimc.htm (466 words)

	SpeedGuide.net Broadband Community - Full duplex or Half duplex for Charter Pipeline...please read.
		SpeedGuide.net Broadband Community - Full duplex or Half duplex for Charter Pipeline...please read.
		Full duplex or Half duplex for Charter Pipeline...please read.
		If you cable modem is a Surfboard 4100 you can put anything you want in any of the settings, the performance will be exactly the same in my experience since your cable connection is only capable of 10Mbps/ Half-Duplex operation.
	forums.speedguide.net /showthread.php?t=45997 (279 words)

	Welcome to Zonet
		Backpressure flow control support for half duplex operation
		Operation: 0°C ~ 50°C (32°F ~ 122°F) Storage: -40°C ~ 70°C (-40°F ~ 158°F) Humidity
		Operation: 10% to 90% RH Storage: 5% to 90% RH Input Power Requirements Voltage
	www.zonetusa.com /DispProduct.asp?ProductID=170 (76 words)

	SysOpt Forums - Got this Hub :-)
		Ahh is that what the "Supports full and half duplex operation on all ports" means?
		Half duplex means..something sends info one way, waits and recieves info at one time.
		Full duplex means info is sent and recieved at the same time....CheeryO!http://www.fancysplace.com/smileys/teacher.gif
	www.sysopt.com /forum/archive/index.php/t-158628.html (338 words)

	Search Results: IEEE Standards Status Report (Site not responding. Last check: 2007-10-03)
		Full duplex mode will be compatible with the existing and future simplex physical layers.
		Project purpose: To support full duplex data transmission between switches, between an end node and a switch, and between a pair of end nodes.
		Full duplex data transmission provides for more efficient operation, especially in cases where the data exchange is symmetrical.
	standards.ieee.org /cgi-bin/status?802.12c-1998 (342 words)

	The Allayer AL102: 8-Port Low Cost Fast Ethernet Switch
		With trunking, you can group up to four full duplex links together to form a single 800 Mbit/s link.
		For half duplex operation, an optional jamming based flow control is available to prevent loss of data.
		In the full duplex mode, the AL102 utilizes the IEEE 802.3X as the flow control mechanism.
	www.amslink.com /allayer99/al102dat.html (436 words)

	Bell Modem Standards 103J, 212, 201B/C, 202T, 202S, 208A/B
		This modulation is well suited for bad phone lines – as the communication guys use to say "103 modems will work on barb wire".
		This versatile standard provides for efficient full-duplex operation over 2-wire dialup lines.
		Bell 201 B compatible modems are the first of the fast modems.
	www.arcelect.com /bell.htm (541 words)

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