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Topic: TTL

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	Transistor-transistor logic - Wikipedia, the free encyclopedia
		TTL became popular with electronic systems designers in 1962 after Texas Instruments introduced the 7400 series of ICs, which had a wide range of digital logic block functions.
		TTL became important because it was the first time that low-cost integrated circuits made digital techniques economically practical for tasks previously done by analog methods.
		TTL was historically considered significantly less sensitive to damage from electrostatic discharge than CMOS, although current CMOS designs now exhibit less static sensitivity than earlier designs.
	en.wikipedia.org /wiki/Transistor-transistor_logic (930 words)

	RFC 3682 (rfc3682) - The Generalized TTL Security Mechanism (GTSM)
		The TTL must either be 255 (for a directly connected peer), or 255-(configured- range-of-acceptable-hops) for a multi-hop peer.
		TTL (Hop Limit) Spoofing The approach described here is based on the observation that a TTL (or Hop Limit) value of 255 is non-trivial to spoof, since as the packet passes through routers towards the destination, the TTL is decremented by one.
		Tunneled Packets An exception to the observation that a packet with TTL of 255 is difficult to spoof occurs when a protocol packet is tunneled to a decapsulator who then forwards the packet to a directly connected protocol peer.
	www.faqs.org /rfcs/rfc3682.html (2330 words)

	TTL - a Whatis.com definition - see also: time-to-live (Site not responding. Last check: 2007-11-06)
		Time-to-live (TTL) is a value in an Internet Protocol (IP) packet that tells a network router whether or not the packet has been in the network too long and should be discarded.
		Since each router is required to subtract at least one count from the TTL field, the count is usually used to mean the number of router hops the packet is allowed before it must be discarded.
		Using the multicast IP protocol, the TTL value indicates the scope or range in which a packet may be forwarded.
	whatis.techtarget.com /definition/0,,sid9_gci214184,00.html (431 words)

	RFC 3443 (rfc3443) - Time To Live (TTL) Processing in Multi-Protocol Label (Site not responding. Last check: 2007-11-06)
		TTL processing in both Pipe and Uniform Model hierarchical tunnels are specified with examples for both "push" and "pop" cases.
		TTL processing in MPLS networks can be broken down into two logical blocks: (i) the incoming TTL determination to take into account any tunnel egress due to MPLS Pop operations; (ii) packet processing of (possibly) exposed packets and outgoing TTLs.
		TTL Processing in different Models This section describes the TTL processing for LSPs conforming to each of the 3 models (Uniform, Short Pipe and Pipe) in the presence/absence of PHP (where applicable).
	www.faqs.org /rfcs/rfc3443.html (1841 words)

	Difference between M6 and M6 TTL?
		The TTL flash sensor may or may not mean anything to you depending on whether you use flash a lot; I don't think most Leica shooters care very much.
		If you're running around with the TTL securely in your hand or leaving it resting on the shelf -- but not using it for hours on end -- you can leave the time settings just as they were for the last shot, until, of course the sun goes down...
		For me it is important, but you will get use too ttl if you choose one.But one again the meter of the classic is good enought and don't run battery when you use it, however if it is not on B position.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=007q90 (1159 words)

	The Canon EOS system - Frequently Asked Questions
		TTL Flash Metering Sensor: The TTL flash metering sensor (positioned in the camera's mirror chamber and aimed at the film plane) is used for A-TTL and TTL flash readings off the film plane during exposure.
		A-TTL also uses a preflash, but unlike E-TTL, the preflash is used to calculate an aperture value based on the distance that light must travel from the flash to the subject.
		TTL (Through-The-Lens) is the automatic flash exposure control mode used by the small pop-up flash units built into some EOS cameras.
	bobatkins.com /photography/eosfaq/flashfaq.htm (2880 words)

	Appendix A - BIND TTL Values
		TTL in the DNS context defines the duration in seconds that the record may be cached.
		The default TTL for the zone is defined in BIND9 by the $TTL directive which must appear at the beginning of the zone file i.e.
		RFC 1912 recommends that the $TTL value be set to 1 day or longer and that certain RRs which rarely change, such as the MX records for the domain, use an explicit TTL value to set even longer values such as 2 to 3 weeks.
	www.zytrax.com /books/dns/apa/ttl.html (428 words)

	74LS TTL Components
		The TTL family of integrated circuits was introduced about 20 years ago by Texas Instruments.
		TTL stands for Transistor Transistor Logic, which signifies that two transistors are used to drive each output of each chip, one for pulling the output down to a low level, and one for pulling the output up to a high level.
		It is interesting to note that, in each generation of the TTL family, the low power representative of that generation is about 3 times slower than the other member, but consumes about 1/10 the power.
	www.cs.uiowa.edu /~jones/logicsim/man/node5.html (1686 words)

	Advanced TTL
		Advanced TTL has been developed as the direct result of the interest and requests of Basic TTL academy graduates and others interested in having an opportunity to extend their technical skills and capabilities.
		Advanced TTL is a two-week residential academy focusing on advanced technologies and skill extension with familiar applications.
		General: As with other TTL academies, Advanced TTL is funded through the Department of Education and Cultural Affairs as a part of its ongoing effort to develop and implement improved forms of continuing and sustained professional development opportunities for educators.
	www.sdttl.com /2002/advanced.htm (471 words)

	Kiev 88 Plain Glass and TTL Metering Prism Finder (Site not responding. Last check: 2007-11-06)
		The TTL Meter Prism for the Kiev 60 (and Kiev 6C) was downgraded in quality to take the later 3 LR44 (small) type batteries, when Mercury cells began to be discontinued.
		I did have the TTL version at one point on a Hartblei (sp) (Kiev) the meter was junk on that one.
		It is important to remember, of course, that the Bronica TTL meter is coupled to the shutter speed dial (by means of an astoundingly clunky attachment), while the Kiev is totally uncoupled.
	medfmt.8k.com /mf/kievttl.html (13065 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		TTL started as an experiment during the development of Notus, a GUI template library.
		There is nothing to be built or installed, just copy the TTL files into one of you folders and and make sure that this folder is in the list of include folders in your compiler.
		TTL never throws an exception type other than derived from the ttl::exception class.
	tinytl.sourceforge.net (1210 words)

	TTL (Time To Live)
		All DNS records have a TTL property, specifying the amount of time other DNS servers and applications are allowed to cache the record.
		When a DNS record is stored in the cache of a DNS server, the record's TTL is continuously reduced as time go by, and when the TTL finally reaches zero the record is removed from the cache.
		Setting a record's TTL to zero, means that applications and DNS servers are not allowed to cache the record.
	www.jhsoft.com /help/df_ttl.htm (366 words)

	ECD TTL-530 Interface Converter - by Bomara Associates
		The TTL-530 Interface Converter is designed to provide signal level conversion between TTL Clock and Data signal levels (as used in telemetry equipment) and RS-530 (V.11) DTE (Terminal) equipment.
		The TTL-530 accepts TTL signal levels into the Input Ports via BNC connectors.
		The TTL signal levels are converted to ITU V.11 (Balanced) voltage levels and are then transmitted on the Output Port.
	www.bomara.com /ecd/ttl530.htm (280 words)

	Leica - 999 M6 TTL (Site not responding. Last check: 2007-11-06)
		Leica Camera AG presents a special edition of the last 999 LEICA M6 TTL, concluding the production of the the LEICA M6 - a range-/viewfinder camera with a mechanically-controlled shutter - after a run of 18 years.
		These 999 LEICA M6 TTL cameras are identified by the imprint "LEICA M6 1984 - 2002" on their top plate.
		The imprint indicates the introduction of the camera in 1984 and its termination in December 2002.
	www.leica-camera.com /produkte/msystem/m6ttl/index_e.html (274 words)

	Amazon.com: Books: TTL Cookbook (Site not responding. Last check: 2007-11-06)
		I even built TTL gizmos that were more advanced than the book's examples, simply because I learned enough from reading to be able to do so (and I was 15 years old at the time).
		The methods and rules to follow for using TTL are spelled out so that one can build reliable circuits.
		The examples given are explained so that one may draw their own conclusions, and use the examples as building blocks or teaching aids to develop one's own circuits.
	www.amazon.com /exec/obidos/tg/detail/-/0672210355?v=glance (826 words)

	TTL - LinuxQuestions.org Wiki
		The purpose of the TTL is to ensure the mortality of packets.
		TTL values depend on the operating system that sent the packet.
		The TTL is used by the traceroute program to measure the path a packet takes, by sending a probe with a TTL of 1, making the first node in the route report an error and thus making itself known.
	wiki.linuxquestions.org /wiki/TTL (236 words)

	Time To Leave 2.1
		Most people don't have time and memory to remember all the files they left in every corner of their computer, and all cleanup manager don't touch such files, as they are not temporary, junk or garbage.
		It is user friendly, you don't need to run TTL ("Time To Leave") each time, you want to set the lifetime of your file or folder.
		TTL can do this for you - you can just mark file or folder as "sacrificed", after you downloaded it, and don't worry about the disk space it consumes - if it is still here, you have no problems with free space.
	www.mondor.org /ttl/index.htm (1008 words)

	Using a polarizer effectively without TTL control
		To guarantee workable TTL control with a rangefinder in all conditions, you'd have to carry an LCD shade.
		If the direction of maximum polarization is within ~45° of the horizontal, and you happen to be wearing polarized sunglasses, pan and tilt your head until you get maximum effect, then match the pan with your camera angle and align your polarizer's blocking direction with the right-left axis of the glasses.
		To use a polarizer effectively without TTL control, you must first find and if necessary mark your polarizer's blocking axis, which may or may not align with a white dot or other symbol on the polarizer's outer rotating ring.
	dpfwiw.com /polarizer.htm (8130 words)

	Two-Input TTL NOR Gate (Site not responding. Last check: 2007-11-06)
		TTL integrated circuits provide multiple inputs to NAND gates by designing transistors with multiple emitters on the chip.
		As you may recall from earlier experiments, it is substantially the same as the RTL and DTL NOR gates we have already explored.
		This circuit is an extension of the TTL inverter, and requires that you have the inverter in place as a starting point.
	www.play-hookey.com /digital/experiments/ttl_nor2.html (980 words)

	[No title]
		Abstract This document describes Time To Live (TTL) processing in hierarchical Multi-Protocol Label Switching (MPLS) networks and is motivated by the need to formalize a TTL-transparent mode of operation for an MPLS label-switched path.
		If the Agarwal & Akyol Standards Track [Page 6] RFC 3443 TTL Processing in MPLS Networks January 2003 PHPed label was a Uniform Model LSP, then the TTL field of the PHP exposed header is set to the oTTL.
		The authors believe that clarification of TTL handling in MPLS networks benefits service providers and their customers since troubleshooting is simplified.
	www.ietf.org /rfc/rfc3443.txt (1872 words)

	Knowbuddy's Gnutella FAQ
		Also, each servent has the option to arbitrarily lower the TTL of a packet if it thinks it is unreasonable.
		So, even if I send all my packets with a TTL of 200, the odds are that most of the servents along the way are going to just immediately knock this down to a more reasonable number.
		However, it is in her best interests, for bandwidth reasons and anonymity, to only connect to one proxy server at a time and no one else.
	www.rixsoft.com /Knowbuddy/gnutellafaq.html (3587 words)

	TTL - susning.nu
		TTL är ett sätt att bygga digital elektronik med transistorer på både ingångar och utgångar.
		Inom datakommunikation står TTL för Time To Live och används bland annat för DNS-poster och är en parameter i ett IP-paket som anger antalet routing-hopp som paketet tillåts överleva.
		TTL står för Through The Lens och innebär att ljuset mäts genom objektivet.
	www.susning.nu /TTL (194 words)

	Flash Photography with Canon EOS Cameras - Part I. (Site not responding. Last check: 2007-11-06)
		TTL and A-TTL flash use the former and E-TTL the latter.
		Since the A-TTL sensor is on the front of the flash unit - behind a recessed plastic lens and not inside the camera, metering through the camera lens, it’s conceivable that a very heavy filter on the lens might result in some metering problems since the filter doesn’t cover the sensor as well.
		were introduced; TTL and A-TTL in the case of the EZ units and TTL and E-TTL in the case of the 550EX and 580EX.
	photonotes.org /articles/eos-flash (13788 words)

	TTL - Transistor Transistor Logic
		A term used to describe the method of creating logical gates using 2 transistors.
		TTL also refers to a series of Integrated Circuits.
		One of the benefits of using TTL circuits over CMOS circuits is the fact that they are not easily damaged by static unlike CMOS devices, however, CMOS has a lower power consumption and is generally better for use in integrated systems.
	www.helpwithpcs.com /jargon/ttl.htm (64 words)

	Zvon - RFC 3682 [The Generalized TTL Security Mechanism (GTSM)] - Security Considerations
		The approach described here is based on the observation that a TTL (or Hop Limit) value of 255 is non-trivial to spoof, since as the packet passes through routers towards the destination, the TTL is decremented by one.
		An exception to the observation that a packet with TTL of 255 is difficult to spoof occurs when a protocol packet is tunneled to a decapsulator who then forwards the packet to a directly connected protocol peer.
		Protocol packets may also be tunneled over MPLS to a protocol peer which either the penultimate hop (when the penultimate hop popping (PHP) is employed [RFC3032]), or one hop beyond the penultimate hop.
	www.zvon.org /tmRFC/RFC3682/Output/chapter5.html (830 words)

	Discussions @ Nikonians - sb 28 FP and TTL?
		I don't think TTL in FP mode is possible at high shutter speeds with a focal plane shutter.
		To overcome this problem, when the flash is in FP mode, it fires a series of flashes that covers the time it takes the focal plane slit to move across the frame.
		In normal TTL mode the flash is quenched when proper exposure is obtained.
	www.nikonians.org /dcforum/DCForumID7/345.html (1681 words)

	Wireless TTL Slave Sensors (Site not responding. Last check: 2007-11-06)
		The unbelievable capability of these sensors is providing wireless TTL slave operation within 1/10th of one f/stop precision.
		Slave Sensors providing cordless TTL compatibility were introduced to the underwater world by Ikelite in the mid nineties.
		The best performance is achieved by putting the sensor in a small housing that can be aimed at the strobe attached to the camera, assuring the sensor will not be confused by the flash it controls.
	www.ikelite.com /web_pages/dsensors.html (270 words)

	TTL (Site not responding. Last check: 2007-11-06)
		There are two major TTL IC families: the 7400 series which is the most common family of TTL ICs and the 5400 series of ICs.
		Most TTL ICs are further categorized according to their subfamilies.
		(The normal high output for a TTL IC is about 3.5V) In this case the output of an open-collector TTL IC would be connected thru a pull-up resistor to a 7 Volt supply.
	www.hcc.hawaii.edu /~richardi/113/c113_2c/2c_2/2c2.htm (299 words)

	TTL Update 2001
		The TTL staff continues to be committed to providing faculty with highlights from the various LISTs that support the discussion of technology in education.
		His research interests for the TTL project are in technology curriculum integration, especially as it relates to unique approaches to distance learning and teacher collaboration on the web.
		Teams are expected to meet with TTL staff monthly to identify areas of need for additional technology support (workshops, tutorials, etc.) and, at least, on additional time together to plan and/or work on course development issues.
	www.gwu.edu /~ttl/updates/archive2001/aug01.htm (2300 words)

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