Factbites
 Where results make sense
About us   |   Why use us?   |   Reviews   |   PR   |   Contact us  

Topic: Cell relay


Related Topics

In the News (Sun 16 Jun 19)

  
  Cell relay - Wikipedia, the free encyclopedia
ATM, a particularly popular form of cell relay, is most commonly used for home DSL connections, which often runs between 128 kbit/s and 1.544 Mbit/s (DS1), and for high-speed backbone connections (OC-3 and faster).
Note 2: Cell relay protocols (a) have neither flow control nor error correction capability, (b) are information-content independent, and (c) correspond only to layers one and two of the ISO Open Systems Interconnection--Reference Model.
Note 4: Cell relay is an implementation of fast packet technology that is used in (a) connection-oriented broadband integrated services digital networks (B-ISDN, and its better-known supporting technology ATM) and (b) connectionless IEEE 802.6, switched multi-megabit data service (SMDS).
en.wikipedia.org /wiki/Cell_relay   (235 words)

  
 Cisco Systems StrataCom Strategic Wide Area ATM Networks
Another advantage of cell relay networks is the flexibility of offering Permanent Virtual Circuits (PVCs) to interconnect all LAN sites in a mesh topology, in contrast to using physical circuits that require a large investment in interface hardware and data circuits.
Cell relay technology is also referred to as cell switching, FastPacket, or asynchronous transfer mode (ATM).
The cell size was chosen as a compromise between a small cell with short delay, better for voice quality, and a larger cell size with a better ratio of data to overhead, best for data transmission.
www.alliancedatacom.com /manufacturers/cisco-systems/stratacom.asp   (7888 words)

  
 Cell Relay ATM FAQ - Table of Contents
The purpose of the Cell-Relay group is to provide a forum for the submission of articles and inquiries dealing with networks using Cell Relay as a transport; including local, metropolitan, and wide area networks.
The term "cell" in cell-relay is taken to mean a small, fixed sized, information bearing unit that provides the foundation for transport and multiplexing of user traffic.
The FAQ is now maintained by the Cell Relay Janitors.
cell.onecall.net /cell-relay/FAQ/ATM-FAQ   (360 words)

  
 Encyclopedia: Cell relay   (Site not responding. Last check: 2007-10-22)
In computer networking and telecommunications, packet switching is a communications paradigm in which packets (messages or fragments of messages) are individually routed between nodes, with no previously established communication path.
Transmit flow control: In data communications systems, control of the rate at which data are transmitted from a terminal so that the data can be received by another terminal.
Asynchronous Transfer Mode, or ATM for short, is a cell relay network protocol which encodes data traffic into small fixed sized (53 byte; 48 bytes of data and 5 bytes of header information) cells instead of variable sized packets as in packet-switched...
www.nationmaster.com /encyclopedia/Cell-relay   (757 words)

  
 comp.dcom.cell-relay FAQ: ATM and related technologies (part 4/8)   (Site not responding. Last check: 2007-10-22)
Cell Relay FAQ - Copyright Notice and Disclaimer The Cell Relay FAQ is posted periodically in multiple parts as a Usenet News FAQ under the title comp.dcom.cell-relay FAQ: ATM, SMDS, and related technologies.
Cells which are delayed beyond the value specified by CTD are assumed to be of significantly less value to the application.
The cells traveling in the CBR QoS class were designated as CBR at connection setup time because either the application would not operate satisfactorily otherwise (e.g., high quality voice traffic, circuit emulation,...) or because the user is willing to pay for the consistently low latency and low cell loss, even for his IP traffic.
omicron.felk.cvut.cz /FAQ/articles/a3081.html   (10324 words)

  
 Definition: cell relay   (Site not responding. Last check: 2007-10-22)
cell relay: A statistically multiplexed interface protocol for packet switched data communications that uses fixed-length packets, i.e., cells, to transport data.
Note 3: Cell relay systems enclose variable-length user packets in fixed-length packets, i.e., cells, that add addressing and verification information.
Note 4: Cell relay is an implementation of fast packet technology that is used in (a) connection-oriented broadband integrated services digital networks (B-ISDN) and (b) connectionless IEEE 802.6, switched multi-megabit data service (SMDS).
www.its.bldrdoc.gov /projects/devglossary/_cell_relay.html   (185 words)

  
 Asynchronous Transfer Mode (ATM) Switching   (Site not responding. Last check: 2007-10-22)
Small, fixed-length cells are well suited to transferring voice and video traffic because such traffic is intolerant of delays that result from having to wait for a large data packet to download, among other things.
The ATM physical layer has four functions: Cells are converted into a bitstream, the transmission and receipt of bits on the physical medium are controlled, ATM cell boundaries are tracked, and cells are packaged into the appropriate types of frames for the physical medium.
For all cells except the last, a bit in the Payload Type (PT) field is set to 0 to indicate that the cell is not the last cell in a series that represents a single frame.
www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/atm.htm   (7582 words)

  
 ipedia.com: Asynchronous Transfer Mode Article   (Site not responding. Last check: 2007-10-22)
Asynchronous Transfer Mode, or ATM for short, is a cell relay network protocol which encodes data traffic into small fixed sized (53 byte) cells instead of variable sized packets as in packet-switched networks (such as the Internet Protocol or Ethernet).
The cells are typically sent on demand within a synchronous time-slot pattern in a synchronous bit-stream: what is asynchronous here is the sending of the cells, not the low-level bitstream that carries them.
Which AAL is in use for a given cell is not encoded in the cell: instead, it is negotiated by or configured at the endpoints on a per-virtual-connection basis.
www.ipedia.com /asynchronous_transfer_mode.html   (1703 words)

  
 A Novel Ras-interacting Protein Required for Chemotaxis and Cyclic Adenosine Monophosphate Signal Relay in ...
Briefly, cells are plated as a monolayer on nonnutrient agar and examined by phase contrast video microscopy using a 4× objective.
Cells were pulsed for 5 h with 30 nM cAMP, plated on coverslips as described previously, and examined by differential interference contrast microscopy.
Cells were pulsed for 5 h with 30 nM cAMP and stimulated with cAMP, and measurements were taken for the quantitation of cGMP as described in MATERIALS AND METHODS.
www.molbiolcell.org /cgi/content/full/10/9/2829   (7270 words)

  
 Cell Phone Use Changes Life in Africa - Forbes.com   (Site not responding. Last check: 2007-10-22)
As cell-phone relay towers sprout on the slopes of Mount Kilimanjaro and the Serengeti plain, providers are racing to keep up with their exploding market.
Cell phone subscriptions jumped 67 percent south of the Sahara in 2004, compared with 10 percent in cell-phone-saturated Western Europe, according to Mo Ibrahim, the Sudanese who chairs Celtel, a leading African provider.
On the downside, however, bus passengers on cross-country journeys have to turn off their cell phones because criminals are known to use them to coordinate highway robberies.
www.forbes.com /home_asia/feeds/ap/2005/10/16/ap2279251.html   (1128 words)

  
 Cells and Cell Relay (Linktionary term)
Cells are the basic unit for packaging and transmitting data in ATM.
Cell relay is the process of moving cells through switching elements.
The term "cell tax" is often used to describe the overhead imposed by ATM cells.
www.linktionary.com /c/cell_relay.html   (453 words)

  
 Cool Cell™ – Relay Rack
Relay Rack Cool Cells™ contain a 28" high rack for mounting batteries, chargers, radios and/or low power electronic equipment.
Cool Cell™ protects batteries on standby against freezing for up to six days at 0 degrees F; longer if housed with chargers and electronic equipment.
Cool Cell's patented passive hydrogen ventilation system maintains hydrogen concentrations below 50% of the 4% lower explosive limit when tested at 200 ml of hydrogen per minute.
www.zomeworks.com /coolcell/relayrack.html   (163 words)

  
 [No title]
The Cell Relay FAQ is posted periodically in multiple parts as a Usenet News FAQ under the title comp.dcom.cell-relay FAQ: ATM, SMDS, and related technologies.
ATM is a connection orientated protocol and as such there is a connection identifier in every cell header which explicitly associates a cell with a given virtual channel on a physical link.
An SMDS cell therefore is nearly identical in form to an AAL3/4 cell.
www.shorty.com /info/cellr/cellrelay-part2   (6133 words)

  
 Frame Relay towards the Future   (Site not responding. Last check: 2007-10-22)
The acceptance of frame relay and the introduction of many public services based on the protocol means that frame relay becomes accepted and installed by many different companies.
Cell relay is the basis for the B-ISDN services based on the ATM implementation.
Cell relay backbone networks are introduced for all traffic types, over ISDN, and much higher speeds.
www2.rad.com /networks/1995/fram-rel/future.htm   (521 words)

  
 Designing ATM Internetworks   (Site not responding. Last check: 2007-10-22)
For all cells except the last cell, a bit in the PT field is set to zero to indicate that the cell is not the last cell in a series that represents a single frame.
When the cell arrives at its destination, the ATM layer extracts the payload field from the cell; the SAR sublayer reassembles the CS PDU; and the CS uses the CRC and the length field to verify that the frame has been transmitted and reassembled correctly.
It is assumed that cells received will be in sequence, and when the End of Message (EOM) cell arrives, you should just have to reassemble all of the cells that have already arrived.
www.cisco.com /univercd/cc/td/doc/cisintwk/idg4/nd2008.htm   (11054 words)

  
 Halfbakery: Personal/group cell-phone relay
They were developing a mini-cell for the home which would connect via the phone line in the home and allow calls from your cell handset to be made across the standard phone line and in progress calls would somehow be passed to or from this mini-cell as you approach or depart your home.
The "cell phone" booster things are about as useful as the "cell phone radiation protectors" that stick on the earpiece.
I'm not a cell phone junkie so I don't know for sure, but I would guess that the cell phones that act as modems would allow control of their dialing, call termination, etc. from the interface port.
www.halfbakery.com /lr/idea/Personal_2fgroup_20cell-phone_20relay   (1468 words)

  
 Cell relay   (Site not responding. Last check: 2007-10-22)
A concept in which data is sent over a network in relatively small, fixed-size packets, or cells (ATM is based on cell relay).
In a cell relay network, if the cells are sufficiently small, then so are the odds that one cell will occupy the transmission facilities long enough to cause an unacceptable delay.
With cell relay it's important to note that the cells may be of any size as long as all of the cells within that closed system are the same size.
www.networkworld.com /details/687.html?def   (881 words)

  
 Cell Relay
Cell Relay is a newer approach to data networks.
In order to support voice, the data units must be small so that they can be processed quickly and sent through the network with minimal delay.
In a cell relay network, the facility is used when needed.
www.tekelec.com /ss7/protocols/switching3.asp   (166 words)

  
 Figure 1 | Cell biologyProteolytic relay comes to an end : Nature   (Site not responding. Last check: 2007-10-22)
The role of protein breakdown in separation of sister chromatids during cell division in yeast.
Cell biology: Proteolytic relay comes to an end
This degradation is physiologically meaningful — if it is interfered with, division of the resulting daughter cells causes the subsequent generation of daughter cells to receive an irregular number of chromosomes.
www.nature.com /nature/journal/v410/n6831/fig_tab/410882a0_F1.html   (193 words)

  
 cell relay - Ecommerce Guide - Terms You Need to Know to Do Business on the Internet
A data transmission technology based on transmitting data in relatively small, fixed-size packets or cells.
Cell relay systems can reliably carry live video and audio because cells of fixed size arrive in a more predictable way than systems with packets or frames of varying size.
Asynchronous Transfer Mode (ATM) is the cell relay standard set by the CCITT organization.
e-comm.webopedia.com /TERM/C/cell_relay.html   (137 words)

  
 ABC News: Cell Phones Can Be a Lifeline for Migrants   (Site not responding. Last check: 2007-10-22)
A cell phone proved to be their lifeline Sunday.
Cell phones and two-way pagers have long been a part of the people-smuggling trade in the Southwest.
Officials track which cell tower relayed the call and searchers home in through topographical descriptions from the migrants.
abcnews.go.com /US/wireStory?id=798461   (424 words)

  
 Computing ICR and Xrm given CIF and RTT
Cells in Frames (CIF) has been specified by the Cells In Frames Alliance in order to extend ATM protocol end-to-end to the desktop, even where it is uneconomic to install a new NIC card for the end-station on the desktop or even to open its case.
The cell payload count field is a 5-bit unsigned integer indicating the number of cell payloads which follow this CIF header and to which it applies.
In VCs using AAL5 the cell payloads associated with a particular CIF header shall all belong to the same CPCS-PDU, and the last cell payload of the CPCS-PDU may be included in the same group as cell payloads that are not the last by using the format 2 Payload Type Toggle Indication flag.
www.ziplink.net /~lroberts/Atmf-961104.html   (12027 words)

  
 WA State 9-1-1/TTY Education Program - 9-1-1 : OK to use Relay Service, Cell Phone, etc?
Relay Service (TTY-to-Voice, Voice Carry Over (VCO), Hearing Carry Over (HCO),Video, and Internet) is not considered a direct access.
If you must use relay service, it is important to inform the operator that the call is an EMERGENCY.
Also they are not responsible for product or any website that may not be accurate or may change without their knowledge.
www.cscdhh.org /911/911_relayservice.htm   (213 words)

  
 A Novel Ras-interacting Protein Required for Chemotaxis and Cyclic Adenosine Monophosphate Signal Relay in ...
cells are unable to properly polarize in a cAMP gradient and chemotaxis
Cell, September 1, 2005; 16(9): 4256 - 4266.
Cell, April 1, 2000; 11(4): 1275 - 1291.
www.molbiolcell.org /cgi/content/abstract/10/9/2829   (778 words)

  
 [No title]   (Site not responding. Last check: 2007-10-22)
With the increasing importance of ATM and mixed type data streams, this latter definition is becoming more important.
Signalling, in cell and frame relay, fulfills a function (very roughly) analogous to selective routing in an internetwork.
For those approaching cell relay from the telephony side, there is mention, and brief description, of the underlying data communications concepts and protocols such as HDLC (High-level Data Link Control).
sun.soci.niu.edu /~rslade/bkpscrfr.rvw   (108 words)

Try your search on: Qwika (all wikis)

Factbites
  About us   |   Why use us?   |   Reviews   |   Press   |   Contact us  
Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.