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	56 kbit/s line - Wikipedia, the free encyclopedia
		A 56 kbit/s line is a digital connection (possibly a leased line, possibly switched) capable of carrying 56 kilobits per second (kbit/s), the data rate of a normal single channel digital telephone line in North America.
		With the wide deployment of faster, cheaper, technologies such as ADSL and SDSL, 56 kbit/s lines are generally considered to be an obsolescent technology.
		The figure of 56 kbit/s is derived from its implementation using the same digital infrastructure used since the 1960s for digital telephony in the PSTN, which uses a PCM sampling rate of 8000 Hz used with 8-bit sample encoding to encode analogue signals into a digital stream of 64000 bit/s.
	en.wikipedia.org /wiki/56k_line (288 words)

	56k Data Services FAQ
		A 56k leased line is a type of digital leased line, available from your local phone company and similar to a T1 line, which is capable of carrying digital data between two remote locations at a fixed transmit and receive speed of 56,000 bps.
		One major reason why 56k modems rarely live up to their name is because they are designed to extract every spare ounce of speed possible from lines that do not efficiently carry digital data, and were once thought to be fundamentally incapable of anything faster than 9600 bps.
		As the phone line is provisioned by the telco to be used for digital data, there is no bandwidth expended compensating for telco equipment mistakenly "improving" the signal for the human ear, nor are complex protocols and algorithms required to probe the line condition and recover from distortion.
	www.mva.net /support/56kfaq.html (1380 words)

	The 56k Conundrum (Sonic.net, Inc.)
		Ideally, a 56k modem operating under any protocol should be able to attempt to connect at the highest possible speeds, negotiating down to slower speeds as much as is necessary to achieve a stable connection.
		If you use a 56k modem and do not seem to be able to achieve speeds above 33.6 kbps, then the modem is probably not able to achieve higher speeds for one or more of the reasons discussed earlier and is falling back to the slower, more stable v.34 standard.
		Disabling 56k typically involves the use of an init string (short for 'initialization string.') an init string is a command sent to the modem that tells it how to behave during a dialup session.
	www.sonic.net /support/56k/56kprobs.shtml (5300 words)

	USRobotics Line Test
		Since line conditions can change from call to call, we recommend that you make several calls to LineTest to ensure an accurate diagnosis.
		If you have multiple phone lines available for use, we recommend that you try calling from each line.
		Since line conditions can change from call to call, we recommend you try again at another time.
	www.usr.com /products/line-test.asp (522 words)

	What's a 56k-compatible line?
		If you get a 56k modem, and you get 56k connections, you can safely say that you (presently) have a 56k-compatible line.
		In some of the above circumstances, you would be able to achieve a 56k connect with a different modem, or calling a different V.90 server.
		56k Modem manufacturers have generally defined a '56k-compatible line' as being one that has only 1 D/A conversion (or 1 A/D conversion), and your local loop is less than 3½ miles.
	modemsite.com /56k/56kline.asp (334 words)

	K56Flex General Information (Site not responding. Last check: 2007-10-11)
		The lines from USWest to Nextlink to Cutting Edge are all clean, digital lines, but the US West residential lines in Spokane are not.
		First, and the most common barrier to 56K performance, is the presence of a SLC 96 (pronounced "slick") concentrator in your neighborhood.
		Another problem occurs when a phone line is stretched beyond 18,000 feet from a telco central office, which is beyond the effective range of the 56K technology.
	home.cet.com /support/k56info.htm (542 words)

	56K Line Problems
		Line noise problems are also affected by rain so changes in whether need to be considered.
		One of them is line noise on the line from your home to the central office.
		After a disconnect, pick up a phone on that line and dial one digit (not 9 or 0) and listen for a minute or so.
	www.lafn.org /faq/dialer/problems.html (2786 words)

	Pacific Online - Member Support (Site not responding. Last check: 2007-10-11)
		These screen shots and instructions will walk you through the 56k line test which is designed to determine if your phone lines are 56k compatible.
		Now the line test is actually testing your phone lines for 56k compatibility.
		If you ran the line test because you get frequent, random disconnections or connect at a low speed (28,000 BPS or lower) you should contact our technical support so that we can remedy your connection issues.
	www.pon.net /support/linetest (704 words)

	[No title]
		For good 56K connections, your modem must be within about 3.5 miles of Station A. From Station A to Station X, the signal travels through the Telco's system (it may even change Telco's along the way).
		Line conditions (noise, interference, etc.) may also vary from one call to the next and again, even within a single call.
		Line quality which is adequate for voice transmissions may not be adequate for high speed data transmissions.
	www.panetwork.com /IQ/56Kmodem.htm (1882 words)

	56K.COM: 56K Modem Troubleshooting Guide: Help with slow connects
		Also try running the phone line directly from the back of the modem to the wall, without passing through surge suppressors, splitters, phone line extenders, etc. This is a basic and useful step in modem troubleshooting.
		As explained in the Basics section of the 56K Primer, multiple digital/analog conversions will prevent the use of 56K technology and limit your modem to V.34 speeds (a maximum of 33.6K).
		V.34 and 56K modems can and do shift their speeds up and down during the course of the call to respond to changing line conditions.
	www.56k.com /trouble/connect.shtml (2142 words)

	Peak to Peak Internet - 56K Modems (Site not responding. Last check: 2007-10-11)
		While we won't support x2 56K modems ever, the information is still applicable to testing your telephone lines, as the test is the same for K56flex, V.90, or x2 modems.
		If such a system is present, the line from a subscriber's phone first goes to a SLC "remote terminal" (which is typically in an underground vault in the neighborhood, in the basement of the office building, etc.).
		This is all normal because the availability of 56K depends on your call routing which may change at anytime at the whim of the phone company.
	www.peakpeak.com /support/56kwhitepaper.html (1034 words)

	No Hype 56k Modem Page
		56k modems upload at a maximum speed of 28.8 or 33.6kbps (see point 5 for more details on upload speed).
		Even if you have a set of 56k modems, remember that you'll be running up to 53kbps in one direction and 33.6kbps or less in the other.
		But the whole issue of download speed reducing upload speed (point 5) can make remote access with a 56k modem less efficient than with a 33.6 modem even if it is a local call and you have a receiver modem.
	www.lowendmac.com /56k/hype.shtml (2751 words)

	[No title] (Site not responding. Last check: 2007-10-11)
		Q2: "What does this 56K, T1 stuff mean?" A: Literally, "56K" means 56,000 bits per second, and when spoken around telephone and WAN (Wide Area Networking) circles, implies a class of bit-synchronous digital service provided by most telephone companies, which are a staple for providing IP service.
		Q3: "What exactly is a leased line?" A: A "leased line" is the casual, informal name for a connection to the Digital Data Network, the digital switching system used by the telephone companies.
		Latency on a 56K link is about 10 milliseconds (1/100th of a second), virtually unnoticable, and doesn't vary much with load (though "ping" times will of course stretch out on a busy system).
	massis.lcs.mit.edu /telecom-archives/archives/reports/internet.via.leased.line (4611 words)

	What sorts of returns can I expect making as an ISP?
		To make matters worse for the 56k connection, the standard of 10 users per phone line is effective for about 16 phone lines and up.
		For fewer lines, you may be talking about 7-8 users per phone line, because the concentrations of users tend to clump more for a small number of people.
		If you're a small, rural ISP with only enough capital for a 56k or 128k line, a particularly intriguing idea would be to run your own direct access site off the 56k, but co-locate with a large, urban company for your web sites.
	www.amazing.com /internet/faq-4.0.html (5814 words)

	[No title]
		Ordinary connections begin over an analog line, are converted to digital by the phone company and then converted back to analog in the final segment before arriving at the service provider (ISP.) 56k connections begin analog, are converted to digital and are not converted back to analog at the service provider.
		56K modems can receive data at speeds of up to 56Kbps, however due to FCC (Federal Communications Commission) rulings on maximum permissible transmit power levels during download transmissions, speeds of 54Kbps are the maximum.
		Users who are unable to achieve 28.8 or 33.6 with their current service are unlikely to achieve faster connections with a 56k modem.
	www.csd.toshiba.com /content/support/bulletins/98050243 (917 words)

	56K Questions and Answers (Site not responding. Last check: 2007-10-11)
		The 56K technical specification for the V.90 standard was finalized in February and is scheduled to be ratified at the ITU's September 1998 meeting.
		Although today's modems are capable of 56K connect speeds, current FCC regulations limit download speeds to 53K and upload speeds to 33.6K.
		Tests by leading magazines have shown that the average connect speed on a 56K line is 44K.
	www.95net.com /services/56K.htm (255 words)

	Bluebonnet Technologies, the best internet provider in North East texas!
		There are often severe changes in line conditions during and after inclement weather: moisture in the ground caused by storms, flooding or snowfall will typically make connections less reliable.
		A v.34 or 56k modem does over 2000 line tests when it establishes a connection to determine the maximum speed of the connection that you're using.
		Bluebonnet's lines are optimized for the highest speeds possible: as such, connections higher than 28.8 and approaching 53kbps are possible with our service, but only from areas that have particularly clean telephone service.
	www.bluebonnet.net /modem.htm (3081 words)

	56K Digital FAQ & NFO (Site not responding. Last check: 2007-10-11)
		The phone lines between your home (or calling location) and your closest CO is still Analog and will be for many years to come (unless you purchase an ISDN line).
		The length and quality of the phone lines between your home and the first CO are the determining factor of your connection speed.
		56K is compatible with previous communication standards and the call will fall back to the next fastest speed whenever high-speed communication is not possible, This will happen when network and subscriber loop conditions prevent the full utilization of the 56Kbps modems.
	www.2fords.net /2fordsnfo/56k.html (5032 words)

	This diary is meant to give people an idea of what it takes to put a
		I have dropped a line to the phone company people just to be sure they haven't forgotten me. They haven't, and I have an installation date of May 9th, less than two weeks away.
		Not that bad compared to residence lines, although that install is a killer on top of the $ 1,000 for the 56k install.
		Two more pairs are used for the 56k, meaning that the four data lines I presently have would turn into two data channels (for the 56k) and 22 phone lines through the channel bank.
	www.amazing.com /internet/connection.html (1565 words)

	Starck Associates (Site not responding. Last check: 2007-10-11)
		Newer versions of 56k code probe the line more aggressively and may have a lower original connect speed.
		Line noise may also be the cause of FAX or 56K not connecting (or random spots on faxes).
		Commonly called line noise, problems with downloading or the spurious characters or garbage that appear on the screen are usually from the central office of the phone company.
	www.qadas.com /starck/tech.htm (1980 words)

	Beginner's Guide to the Internet (Site not responding. Last check: 2007-10-11)
		For now, Internet backbone lines are DS3 (fiber) and T3 (copper), and transmit packets at rates of 45Mbps (million bits per second) to 2.49Gbps (billion bits per second), depending on the transmission hardware connected to the backbone line.
		These lines are popular with Internet service providers for the combination of relatively low cost and fast transmission ability from backbones to their systems.
		If you have a T1 line, but the server that has the information you want is hooked to a 128K line, your top transfer rate is based on that 128K line, not your speedy T1.
	www.dematha.org /code/vbs/bgi/band.htm (827 words)

	Using a 3Com/USR modem to test the phone line
		Note that this response curve is the results of the modem adaptive equalizer's heroic attempt to obtain the best response from a POTS phone line and not the actual frequency response of the phone line.
		Almost the entire 56K performance is determined by the frequency response between 2500Hz and 4000Hz.
		The modem should be the very first device connected to the phone line and before any devices that might present a load to the phone line.
	members.cruzio.com /~jeffl/aty11/aty11.htm (1190 words)

	Testing Your Line for 56k Access Capability
		56K technology is possible on this connection, but you are likely to experience reduced performance.
		Since line conditions can change from call to call, we recommend that you make several calls to this test system to ensure an accurate diagnosis.
		If you have multiple phone lines available for use, we recommend that you try calling this system from each line.
	www.wurd.com /instcon_misc_56klt.php (626 words)

	Yes-Web.net - V.90 56K Dial-up Service - National Internet Access - 56k - DSL - ISDN - Free Web Space - Free Shopping ... (Site not responding. Last check: 2007-10-11)
		If you see: "Your line does not support 56K technology." Type in the letter g, then press the 'Enter' key to disconnect.
		If you see: "56K is not currently possible on this connection, or is likely to be highly impaired." Type in the letter g, then press the 'Enter' key to disconnect.
		If you see: "Cannot determine 56K capability, test must run in V.34 mode." Type in the letter g, then press the 'Enter' key to disconnect.
	www.yes-web.net /linetest.htm (535 words)

	IwayNet 56k Leased Line Info.
		A leased telephone line is a service where you pay a flat rate to the telephone company for unlimited use of the a telephone line.
		This can generate substantial savings in a business environment where you are typically billed according to your usage of a line.
		In the case of a 56K leased line you are getting the performance of a 1 channel
	www.iwaynet.net /services/leased.html (72 words)

	[No title]
		If you are ready to dial (Ensuring the phone line is connected on the modem's Line connector), click on [Dial] If you did not hear the dial-tone and the modem dialling sound, the modem is not installed properly or there is a conflict on the modem.
		Common Mistakes made on 56K Many household have a single phone line use for more than one phone or fax devices.
		However, due to further noise on the phone line problem, Lt win modem might connects only in v.34 most of the time.
	www.genica.com /drivers/modemfaqs.txt (1146 words)

	Modem Help
		Lowering that to 57600 will still be faster than the phone lines, so you won't discern a slower connection speed when you're connected, but it will give the modem less flow control errors.
		The website http://www.ntinet.com/line_testing.htm gives instructions on how to check for noise on the line and also how, on some modems, you can send certain commands to it that will tell you the voltage level of the phone line and other parameters.
		Additionally, many people are switching to a high speed internet service which doesn't use the phone line or modem at all, such as wireless.
	www.ncidata.com /support/modem/modemhelp.html (732 words)

	BerkshireNet Services [Dedicated]
		For example, a 56k DDS line's phone company charges are much less expensive than a T1.
		If you only plan to use 56k of bandwidth, it may be suitable to use a 56k DDS circuit, however, if you ever have to upgrade the speed of your connection to BerkshireNet, you would have to discard the 56k DDS line and install a T1 line.
		ISDN lines consist of 2 64kbps "B" channels and one "D" channel to control the connection.Using ISDN, you can achieve rates of either 64kbps or 128kbps.
	www.berkshire.net /services/dedicated.html (1016 words)

	T1 DSU Fractional T1 (T1-FT1) CSU DSU sub-rate digital service support Synchronous asynchronous
		You simply plug the line service and DTE equipment into the MultiDSU, configure with dip switches or terminal, and you're up and running.
		The 64K DSU combines the flexibility of an RS-232 or V.35 DTE interface with 56K dedicated, 56 switched, or 64K DDS line connectivity.
		The single-rate 56K DSU is a cost-effective solution to terminate DDS services.
	www.arcelect.com /Multitech_multidsu_CSU-DSU.htm (982 words)

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