PSTN


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PSTN

PSTN

PSTN

(Public Switched Telephone Network) The worldwide voice telephone network. Also called the "plain old telephone system" (POTS) and originally analog only, the heart of most telephone networks today is digital. However, the lines from the home and office to the digital loop carrier (DLC) junction box in the neighborhood typically remain analog. At that point, analog signals are converted to digital.

IP Backbones
Increasingly, the digital infrastructure of the PSTN is migrating from the TDM-based circuit-switched architecture to IP-based packet switching (see IP telephony). See digital loop carrier and AIN.


Switched, But Not Too Public
In 1886, this 50-line magneto switchboard, made by Bell Telephone of Canada, was used to switch voice calls in small localities. These instruments were the beginning of the worldwide PSTN. (Image courtesy of Nortel Networks.)
References in periodicals archive ?
local trials to transition customers from PSTN to wireless or VoIP; and,
All this spells the demise of the unified PSTN. We'll each have several different communications systems, all vying for our attention, each with advantages and disadvantages, and mostly incompatible with each other.
Situation 2: The facts are the same as in Situation 1, except that A does not have multiple business locations, and Z uses a dedicated circuit, instead of a SONET ring, to transmit A's telecommunications to the PSTN and others' telecommunications from the PSTN.
There are a few systems on the market that will provide them with both VoIP and PSTN integration, it is important to find one that is designed to work across multiple locations, is easy to use, includes automated features to save staff time, can be remotely managed and will adjust as the business grows.
Lawrence Imeish, principal consultant at Dimension Data says with SIP -- and unlike with PSTN -- one can pool inbound and outbound in minutes, regardless of geography or even country one expects to buy, especially if the traffic is being handled by one national SIP carrier.
Enterprises can safely use our products to create a fully connected Microsoft world, supporting the evolution from TDM PBXs and PSTN networks, to IP systems and SIP Trunking services."
"With our Enterprise Session Border Controller capabilities, customers can safely and transparently migrate from traditional PSTN to SIP Trunking, protecting not only their network from new world VoIP security threats, but also their existing investment in IP and TDM PBX equipment.
XConnect enables feature-rich multi-media communication between VoIP service providers around the world by bypassing the PSTN and also provides PSTN carriers and operators with an efficient and low-cost means to terminate calls destined for VoIP subscribers.
BandTel is a leading provider of VoIP termination to the PSTN. Its solutions are uniquely designed for high volume telecom users such as Call Centers, Enterprise users, Teleconferencing Companies, and Internet Voice Response (IVR) users.
VoIP, Wi-Fi and Bluetooth technology company, Square7, has launched what it claims is the first cordless Internet telephone with both Ethernet and PSTN connectivity - the Cordless DualPhone2.
Using systems built around the MSP products, customers were able to achieve an industry leading voice latency of just 87.6ms and a MOS (Mean Opinion Score--voice quality measurement for both PSTN and VoIP) of 4.1 in benchmark testing by Telecommunications Technology Association of Korea.
The CRTC said that VoIP providers that allow calls to be placed or received from the PSTN should be treated as local exchange services, much the same as their circuit-switched equivalents, under the regulations.