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Topic: Channel access method

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Channel

Frequency modulation

Frequency modulation synthesis

Phase modulation

Analog filter

Oscillation

	POLITE VOICE CHANNEL ACCESS METHOD IN ANALOG FM TRUNKING SYSTEM
		The pm- ferred application of this method is usage in FM tnml- ing system, such as Motorola Smartnet system.
		Once a radio is directed to a voice channel as a receiver, the radio (or radio user) may start transmitting on the voice channel, regardless if somebody else is already transmitting on the same voice channel.
		The radio user did not notice that the channel is busy, or keyed the radio immediately after the first radio.
	www.priorartdatabase.com /IPCOM/000008958 (479 words)

	Channel access method - Wikipedia, the free encyclopedia
		Carrier sense multiple access with collision avoidance (CSMA/CA)
		Carrier sense multiple access with collision avoidance and Resolution using Priorities (CSMA/CARP)
		Where these methods are used for dividing forward and reverse communication channels, they are known as duplexing methods, such as:
	en.wikipedia.org /wiki/Channel_access_method (180 words)

	Common channel access method for a plurality of data stations in a data transmission system and circuit for ... (Site not responding. Last check: 2007-10-14)
		A method is disclosed by which several data stations which use a single communication channel, and which are simultaneously ready to transmit a data packet, can send a request for channel allocation, and will be granted the channel each for one data packet transmission, all within one time frame without central control, polling, or collisions.
		The invention is concerned with an access method to a common transmission channel for a plurality of data stations in a data transmission system in which an address consisting of a plurality of address characters is assigned to each data station, and with an arrangement for implementing said method.
		The novel method disclosed herein provides a near optimum utilization of the available channel capacity, and a prompt acceptance of the requests of all data stations which are ready to send at the beginning of each time frame.
	www.freepatentsonline.com /4096355.html (7158 words)

	Mobile Computing and Wireless Glossary A - D
		The access number gives the caller access to the facilities of the system in which you are roaming.
		A method of sending information in which normal time division multiplexing (TDM) is used, except that to, slots are allocated as needed rather than specific transmitters.
		An RF channel that is allocated solely for the use of a particular user or service.
	www.mobileinfo.com /Glossary/A_D.htm (1801 words)

	Macworld: News: Researchers see trouble ahead for WLAN performance
		This method, sometimes referred to as the "listen before talk," guarantees equally long-term channel access probability to all devices.
		In other words, when a device with a low bit rate captures the channel, it penalizes other devices using a higher rate by degrading the speed of their connections.
		The CSMA/CA channel access method is standardized in the 802.11a, b and g standards, Duda said.
	www.macworld.com /news/2003/07/31/wlan/index.php?pf=1 (396 words)

	MACA - A New Channel Access Method for Packet Radio
		This method, Multiple Access with Collision Avoidance (MACA), was inspired by the CSMA/CA method (used by the Apple Localtalk network for somewhat different reasons) and by the "prioritized ACK" scheme suggested by Eric Gustafson, N7CL, for AX.25.
		This could substantially increase the "carrying capacity" of a simplex packet radio channel used for local communications in a densely populated area, thus satisfying both the FCC mandate to use "the minimum power necessary to carry out the desired communications" (Part 97.313) and to "contribute to the advancement of the radio art" (Part 97.1 (b)).
		These include user access channels (such as 145.01 MHz in many areas) and in temporary portable and mobile operations where it is often infeasible to coordinate a multi-frequency network in advance.
	www.ka9q.net /papers/maca.html (3204 words)

	Networking Terms Glossary (Site not responding. Last check: 2007-10-14)
		This is the principle on which CSMA/CD is based; the control access method used by Ethernet.
		Detection) Channel access method used by Ethernet and IEEE 802.3 in which devices transmit only after finding the data channel clear for some period of time.
		The stations on the network monitor the communications channel to determine whether it is used, and also monitor the channel during transmission to detect when a collision occurs, requiring retransmission.
	www.enterasys.com /support/matrix/glossary.cgi?letter=c (1548 words)

	C50
		A method of establishing security on PPP links where the peers must share a plaintext "secret." The caller sends a challenge message to its receiving peer and the receiver responds with a value it calculates based on the secret.
		A local area network access technique in which multiple stations connected to the same media channel can sense transmission activity on the medium and defer initiating transmission while the channel is active.
		Access scheme to increase Ethernet performance by having an intelligent hub intervene when a collision is detected and "decide" in a fraction of a nanosecond which message is ahead and will be sent.
	www142.nortelnetworks.com /library/tpubs/terms/gloss_c.htm (2653 words)

	Medium Access Control Protocols for Multimedia Traffic in Wireless Networks
		On the other hand, random access channels allow all users to contend for the channel by transmitting as soon as packets are available to send.
		CDMA is an access technique for spread spectrum where all remote terminals in a cell transmit using the whole spectrum of the channel simultaneously.
		The protocol is lacking a method for the network to evaluate if a new user could be admitted to a cell, as well as the procedure followed by the congestion control functionality.
	www.comsoc.org /ni/private/1999/jul/Akyildiz.html (7510 words)

	Citations: MACA--a new channel access method for packet radio - Karn (ResearchIndex)
		Karn, "MACA: A new channel access method for packet radio." in ARRL/CRRL Amateur radio 9th computer networking conference, 1990.
		Karn P. MACA---a new channel access method for packet radio.
		Karn, "Maca - a new channel access method for packet radio," in 9th ARRL Computer Networking Conference.
	citeseer.ist.psu.edu /context/32950/0 (740 words)

	SuperStack II Hub 100 UserGuide
		Channel access method used by Ethernet and IEEE 802.3 in which devices transmit only after finding the data channel clear for some period of time.
		A local area network standard defining a physical medium and its method of placing data, or packet signaling, on a cable.
		Access to the cable is based on CSMA/CD (Carrier Sense Multiple Access/Collision Detection).
	support.3com.com /infodeli/tools/hubs/suprstac/ss100/ssii100/gloss.htm (1028 words)

	CS294-1: Mobile Computing and Wireless Networking Glossary
		Operating method in which transmission is possible simultaneously in both directions of a telecommunications channel.
		A communication channel will be changed to a new communication channel (without the user's intervention) as the mobile terminal moves from from one cell to another.
		Operating method in which transmission is made possible alternatively in one direction of a telecommunications channel, for example, by means of manual control.
	www.cs.berkeley.edu /~adj/cs294-1.s98/glossary.html (1181 words)

	Encyclopedia: Computer network
		This expansion is mirrored by growth in the numbers and types of users of networks from researchers and businesses to families and individuals in everyday use.
		The history of computing is longer than the history of computing hardware and modern computing technology and includes the history of methods intended for pen and paper or for chalk and slate, with or without the aid of tables.
		Jump to: navigation, search Code division multiple access (CDMA) is a method of multiple access that does not divide up the channel by time (as in TDMA), or frequency (as in FDMA), but instead encodes data with a certain code associated with a channel and uses the constructive interference properties...
	www.nationmaster.com /encyclopedia/Computer-network (3003 words)

	What is access? - A Word Definition From the Webopedia Computer Dictionary
		For example, programs can access memory, which means they read data from or write data to main memory.
		For example, a user might be granted read access to a file, meaning that the user can read the file but cannot modify or delete it.
		Most operating systems have several different types of access privileges that can be granted or denied to specific users or groups of users.
	www.webopedia.com /TERM/a/access.html (355 words)

	Protocol for channel access in wireless or network data communication (US5721725)
		A method of operating transceivers where a plurality of transceivers are operable to exchange data over a medium, comprising the steps of:
		Method and apparatus for scheduling access to a CSMA communication medium
		Karn, "MACA, A New Channel Access Method for Packet Radio", Sep. 1990, pp.
	www.delphion.com /details?pn=US05721725__ (375 words)

	PartnerAccess - Product Specifications - Product Specs - Product Data Services
		The channel plays a critical role not only in bringing today's OEM to market as quickly as possible, but also in ensuring consumers have uninterrupted access to manufacturer's product content and information.
		Channel and product marketers face the challenge of efficiently creating, distributing and communicating product content with channel partners — particularly to small and mid-sized resellers.
		If they can't empower channel partners with the most complete, timely and rich product content, the likely outcome is ineffective merchandising and poor sales.
	www.cnetchannel.com /manufacturers/partneraccess.aspx (370 words)

	pocketnow.com Discussion - WiFi Access May Slow Down the Whole Network (Site not responding. Last check: 2007-10-14)
		The CSMA/CA channel access method is part the 802.11a, b, and g standards.
		Some hardware has built-in methods of load-balancing or prioritizing traffic in relation to the speed of access but these are proprietary extensions to the standards.
		Wired users may legitimately complain that their access is degraded by allowing WLAN users.
	discuss.pocketnow.com /showthread.php?postid=44669 (403 words)

	Articles - Modulation (Site not responding. Last check: 2007-10-14)
		When OFDM is used in conjunction with channel coding techniques, it is described as Coded orthogonal frequency division multiplexing (COFDM).
		OFDM is strictly a channel access method and not a modulation scheme.
		The use of on-off keying to transmit Morse code at radio frequencies is known as continuous wave (CW) operation.
	www.wholez.com /articles/Modulation (652 words)

	LUOSYS - Access Channel
		The Access Channel lets you construct Portlets (Portal Pages) using a drag-and-drop method.
		You lay out your person notebook parts, then configure and attach queries and then deploy those parts to run in a strong-authenticating web portal, firing queries against a secure query service that uses pluggable policy evaluators to filter the query results.
		This level of architectural excellence in access controls is unheard of in most HIPAA-compliance security plans.
	www.luosys.com /products_ac.htm (114 words)

	PCWorld.com - Trouble Ahead for Wi-Fi Hot Spots? (Site not responding. Last check: 2007-10-14)
		French researchers say they have pinpointed a problem in wireless LAN technology that could severely impair the performance of newer high-speed networks.
		Engineering experts at France's Centre Nationale de la Recherche Scientifique (CNRS) in Paris have demonstrated how a slow device connected to WLAN hotspot can cause an entire network to drop to a slower speed, citing a common channel access method as the cause, Andrzej Duda, one of the researchers, said Thursday in an interview.
		They observed that when one wireless device, such as a notebook, connects to a WLAN at a lower bit rate than other devices--because it is too far from the access point, for example--performance of the other devices on the network becomes noticeably degraded.
	www.pcworld.com /news/article/0,aid,111834,00.asp (465 words)

	Researchers see trouble ahead for WLAN performance - Computerworld
		This method, sometimes referred to as "listen before talk," guarantees equally long-term channel-access availability to all devices.
		The CSMA/CA channel-access method is standardized in the 802.11a, b and g standards, Duda said.
		"The problem is, 802.11e is still in the workgroups, while operators are now in the starting blocks to introduce 802.11g access points.
	www.computerworld.com /printthis/2003/0,4814,83610,00.html (468 words)

	Error 403 - Forbidden
		You have attempted to access an area for which you have no authorization!
		Generally speaking, it means that you are not listed in an access control file.
		This access files are maintained by the owner of the area, NOT by the Webmasters.
	users.ece.gatech.edu /~siva/ECE6610/reading.html (114 words)

	Intelligent Medium Access for Mobile Ad Hoc Networks with Busy Tones and Power Control
		In mobile ad hoc networks (MANETs),one essential issue is how to increase channel utilization while avoiding the hidden-terminal and the exposed-terminal problems.
		P. Karn, "MACA-A new channel access method for packet radio", in Proc.
		L. Kleinrock and F. Tobagi, "Packet switching in radio channels: Part I-Carrier sense multiple access modes and their throughput-delay characteristics", IEEE Trans.
	www.comsoc.org /sac/private/2000/sep/1647_18sac09-wu.html (480 words)

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