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Topic: Public switched telephone network

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Telephone call

Plain old telephone service

Traffic engineering (telecommunications)

Circuit switching

GSM services

PSTN

Routing in the PSTN

Emergency telephone number

Telephone

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	Public Switched Telephone Network - Wikipedia, the free encyclopedia
		The public switched telephone network (PSTN) is the concentration of the world's public circuit-switched telephone networks, in much the same way that the Internet is the concentration of the world's public IP-based packet-switched networks.
		The PSTN is largely governed by technical standards created by the ITU-T, and uses E.163/E.164 addresses (known more commonly as telephone numbers) for addressing.
		The call is switched using a signalling protocol (SS7) between the telephone exchanges under an overall routing strategy.
	en.wikipedia.org /wiki/PSTN (708 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		In accordance with one aspect of the present invention, a control channel is established between the telephone network, such as a public switched telephone network, and the terminal equipment located at the premises.
		It should be understood, that the public switched telephone network could contact the multi-call terminal equipment for a first incoming call.The public switched telephone network 10, through its multi-call service element 52, then establishes a control channel 58 (Figure 2) for signalling purposes between the multi-call service element and the terminal equipment 20 (Block 102).
		A system according to claim 28 wherein said public switched telephone network includes means for generating an indication through the control channel to the terminal equipment that indicates a remote user desires to initiate a call along with auxiliary information.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=98/51098.981112&ELEMENT_SET=DECL (3351 words)

	Public Switched Telephone Network - Biocrawler (Site not responding. Last check: 2007-11-05)
		The public switched telephone network (PSTN) is the concatenation of the world's public circuit-switched telephone networks, in much the same way that the Internet is the concatenation of the world's public IP-based packet-switched networks.
		Only the very oldest and most backward parts of the telephone network still use analog technology for anything other than the last mile loop to the end user, and in recent years digital services have been increasingly rolled out to end users using services such as DSL and ISDN.
		There are also private networks run by large companies which are linked to the PSTN only through limited gateways, like a large PABX system.
	www.biocrawler.com /encyclopedia/PSTN (675 words)

	Public Switched Telephone Network
		Circuit switching is a very basic concept that has been used by telephone networks for more than 100 years.
		This is the foundation of the Public Switched Telephone Network (PSTN).
		That is the basis of a packet-switched phone network, the alternative to circuit switching.
	www.voice-over-internet.info /pstn.htm (610 words)

	PSTN - Public Switched Telephone Network
		PSTN is a name for the public fixed telephone network.
		Public Switched Telephone Network, a voice and data communications service for the general public which uses switched lines.
		Public Switched Telephone Network is the world's collection of interconnected voice-oriented public telephone networks, both commercial and government-owned.
	www.auditmypc.com /acronym/PSTN.asp (237 words)

	Telecommunications network - Wikipedia, the free encyclopedia
		A telecommunications network is a network of telecommunications links arranged so that messages may be passed from one part of the network to another over multiple links.
		Telecommunications network links may in turn be built out of hierarchical transmission systems.
		The Management Plane is the part of the network that carries the operations and administration traffic required for network management.
	en.wikipedia.org /wiki/Telecommunications_network (156 words)

	SS7/IP Interworking Tutorial
		Telephone companies offload voice calls from public switched telephone networks (PSTNs) to voice-over-Internet Protocol (VoIP) networks because it is cheaper to carry voice traffic over Internet Protocol (IP) networks than over switched circuit networks.
		In the future, IP telephony networks are expected to enable innovative new multimedia services while working seamlessly with legacy telephone networks.
		In a public switched telephone network, for example, a dedicated 64 kilobits per second (kbps) end-to-end circuit is allocated for each call.
	www.pt.com /tutorials/iptelephony (238 words)

	9-17-98, Statement of A. Gerard Roth (Site not responding. Last check: 2007-11-05)
		It is comprised of smaller networks from hundreds of local exchange carriers (your local phone company) which provide a variety of sophisticated, as well as relatively simple telephone services to residential, government, and corporate customers in their defined geographic area.
		A private network may be as simple as a small switch to handle a few telephone extensions, or may be as complex as a large, switched voice and data network.
		Private networks may enable direct electronic funds transfers or system-wide payment mechanisms, and may even deploy private fiber optic circuits which parallel, but are not part of, the public network.
	financialservices.house.gov /banking/91798gte.htm (3396 words)

	Public switched telephone network 2 - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-05)
		Start the Public switched telephone network 2 article or add a request for it.
		Look for Public switched telephone network 2 in Wiktionary, our sister dictionary project.
		Look for Public switched telephone network 2 in the Commons, our repository for free images, music, sound, and video.
	www.sciencedaily.com /encyclopedia/public_switched_telephone_network_2 (167 words)

	ipedia.com: Public Switched Telephone Network Article (Site not responding. Last check: 2007-11-05)
		The public switched telephone network is the concatenation of the world's public circuit-switched telephone networks, in much the same way that the Internet is the concatenation of the world's public...
		Only the very oldest and most backward parts of the telephone network still use analog technology for anything other than the last mile loop to the end user, and in recent years digital services have been increasing rolled out to end users using services such as DSL and ISDN.
		Many observers believe that the long term future of the PSTN is to be just one application of the Internet - however, the Internet has some way to go before this transition can be made: see the article on Voice over IP for more on this subject.
	www.ipedia.com /public_switched_telephone_network_2.html (627 words)

	RFC 3298 (rfc3298) - Service in the Public Switched Telephone Network/Inte
		In most practically important cases, the request from a SPIRITS client is ultimately caused by a request from a Central Office (i.e., a telephone switch) sent to either the SCP or SN, although the Internet-based service initiation by these elements that had not been triggered by the Central Office is theoretically possible.
		Since the currently deployed worldwide wireless networks are based on circuit switching, they are considered PSTN networks for the SPIRITS purposes.
		Nevertheless, there are certain peculiarities of wireless networks, which force considerations to be made in the protocol requirements and in the SPIRITS architecture.
	www.faqs.org /rfcs/rfc3298.html (3567 words)

	Sources of Failure in the Public Switched Telephone Network
		A study of failures in the US Public Switched Telephone Network shows that human intervention is one key to this large system's reliability.
		Although the errors attributed to telephone employees are not the major source of outages, they are the major source of failure among those operational aspects under the companies' control.
		In particular, telephone network designers appear to have exploited some aspects of the network's nature to compensate for complexities introduced by the dependability requirements.
	hissa.ncsl.nist.gov /kuhn/pstn.html (2913 words)

	RFC 3666 - Session Initiation Protocol (SIP) Public Switched Telephone Network (PSTN) Call Flows
		PSTN calls are illustrated using global telephone numbers from the PSTN and private extensions served on by a PBX (Private Branch Exchange).
		In this example, the telephone number is included, and it is shown as being passed as calling party identification through the Network Gateway (NGW 1) to Bob (F5).
		PSTN to SIP Dialing In these scenarios, Alice is placing calls from the PSTN to Bob in a SIP network.
	www.packetizer.com /rfc/rfc.cgi?num=3666 (4214 words)

	PSTN Free - Voice Over IP - VoIP - Public Switched Telephone Network - Free the PSTN Now! - Free Phone Calls
		A switch that serves a selected group of users and that is subordinate to a switch at a higher level military establishment.
		Note: The term is usually applied to public switched telephone networks, but it could be applied more generally to other switched networks, e.g., packet-switched public data networks.
		A switched network accessible by the public for the purpose of originating and terminating telecommunications messages.
	www.pstnfree.com (804 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		In this way the telephone number is associated with the NSAP address of the interface 100 connected to the computer on which the individual has performed a logon.
		A self-configuring telephone interface with signalling controls and A/D codec 303 is connected to a phone jack 312 for connection to a telephone device (not shown).
		The interface device as defined in claim 11 further comprising: an internal bus for connecting the microprocessor to the user input/output unit and the network input/output; and wherein the microprocessor monitors data transactions on the network connection for transactions which are unusual.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/49489.030612&ELEMENT_SET=DECL (6015 words)

	PSTN (Public Switched Telephone Network): Teledatacom Glossary
		PSTN (public switched telephone network) is the world's collection of interconnected voice-oriented public telephone networks, both commercial and government-owned.
		It's the aggregation of circuit-switching telephone networks that has evolved from the days of Alexander Graham Bell ("Doctor Watson, come here!").
		Today, it is almost entirely digital in technology except for the final link from the central (local) telephone office to the user.
	www.artesyncp.com /resources/glossary/pstn.html (151 words)

	What is PSTN? - A Word Definition From the Webopedia Computer Dictionary
		Short for Public Switched Telephone Network, which refers to the international telephone system based on copper wires carrying analog voice data.
		This is in contrast to newer telephone networks base on digital technologies, such as ISDN and FDDI.
		Telephone service carried by the PSTN is often called plain old telephone service (POTS).
	www.webopedia.com /TERM/P/PSTN.html (108 words)

	Part 4: The Public Telephone Switched Network (Site not responding. Last check: 2007-11-05)
		A pair of overhead wires was run from the switching center to each subscriber, and the wires were terminated on a switch-board.
		Each switching center (called a CENTRAL EXCHANGE or METROPOLITAN EXCHANGE) was interconnected to the next, and located geographically center of the existing population to minimize the amount of cable required to reach all subscribers.
		In addition, the computerization of switching centers has reduced the interference and noise associated with voice channels, and high grade (low error rate), high speed (9600bps or higher) communication is now possible over most dial-up voice circuits.
	goforit.unk.edu /datacomm/dc_004.htm (865 words)

	Microsoft Internet Security & Acceleration Server (ISA) 2000 - Public switched telephone network (PSTN) call ...
		The public switched telephone network (PSTN) is a standard, circuit-switched network that is optimized for real-time voice communication.
		It is configured to enable H.323 Gatekeeper to direct calls between the IP and PSTN networks.
		All users are able to make calls to PSTN numbers by using NetMeeting to dial the number from their desktops.
	www.microsoft.com /resources/documentation/isa/2000/enterprise/proddocs/en-us/isadocs/gk_scen_ip-pstn.mspx (198 words)

	Telstra - About Telstra - Corporate Information - Telstra's Network (Site not responding. Last check: 2007-11-05)
		This large, diverse network is monitored and supported through a largely centralised global operations centre, which has a fully tested recovery plan that enables network management to be transferred to an alternate location in the event of an unforeseen disaster.
		Our international switching and transmission requirements are provided by REACH which owns international gateway switches in Sydney and an expanding network of switches across Asia, North America and Europe to augment its state-of-the-art global data/IP system.
		We are continuing to expand the capacity of the GSM network, with more than 200 new base stations established in fiscal 2003 to provide additional capacity and enhance depth of coverage.
	www.telstra.com.au /abouttelstra/corp/infrastructure.cfm (2706 words)

	Mujo Web Designs Glossary of Terms
		More frequently referred to as the public switched telephone network (PSTN).Telephone services based on high-speed, digital communications lines, such as ISDN and FDDI, are not basic telephone service.
		An FXO interface connects to the public switched telephone network (PSTN) central office and is the interface offered on a standard telephone.
		The Cisco FXO interface is an RJ-11 connector that allows an analog connection at the PSTN's central office or to a station interface on a PBX.
	www.mujo.com /glossary.cfm?TermID=156 (309 words)

	Telephone carriers: Public switched network almost 2000-ready
		The Network Reliability and Interoperability Council has good news for government users who are counting on the telephone in case of systems trouble on New Year’s Eve.
		Besides updating software in switches and other network components, the carriers have fixed their business systems and assured themselves of continuity in outside systems, such as power and other utilities.
		Telephone companies also are checking to see whether the nation’s 7,000 public service answering positions—such as 911 emergency services—are in working order, said Frank Ianna, president of AT&T Network Services and NRIC vice chairman.
	www.gcn.com /print/vol18_no30/620-1.html (607 words)

	PSTN: Public Switched Telephone Network
		PSTN, the Public Switched Telephone Network, is a circuit-switched network that is used primarily for voice communications worldwide, with more than 800 million subscribers.
		Originally a network of fixed-line analog telephone systems, the PSTN is now almost entirely digital and also includes mobile as well as fixed telephones.
		Today, the mobile telephone over wireless access network, which is carried through the PSTN trunking network, is becoming increasingly popular.
	www.networkdictionary.com /telecom/pstn.php (370 words)

	Public Switched Telephone Network (Site not responding. Last check: 2007-11-05)
		Also known as the Plain Old Telephone System (POTS) in contrast to xDSL and ISDN (not to mention other forms of PANS).
		The PSTN started as human-operated analogue circuit switching systems (plugboards), progressed through electromechanical switches.
		By now this has almost completely been made digital, except for the final connection to the subscriber (the "last mile"): The signal coming out of the phone set is analogue.
	www.cacs.louisiana.edu /~mgr/404/burks/foldoc/66/94.htm (278 words)

	Method and system for accessing multimedia data over public switched telephone network (US5625404)
		A public switched telephone network for providing information from a multimedia information server to any one of a plurality of subscriber premises, comprises a central office receiving multimedia information signals from a multimedia information server and orders from a prescribed subscriber.
		The central office includes a gateway system for conveying routing data in response to subscriber orders and a switch for routing multimedia signals from the server to the prescribed subscriber in accordance with the routing data.
		A public switched telephone network for providing information from a multimedia information server to any one of a plurality of subscriber premises, comprising:
	www.delphion.com /details?pn10=US05625404 (1803 words)

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