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 ?
technical underpinnings of the PSTN, seeking to move their own customers
The initial stage of the PSTN transition is occurring with
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.
Applying federal income tax principles to Situation 1, the IRS concluded that Z is using its SONET ring and PSTN to provide telecommunications services to A, not providing a combination of telecommunications services with a lease or rental of Z's SONET ring or PSTN to A.
The issue is that the PSTN has always been, and continues to be, a state-based network: switches must keep track of the state of a call at all times.
While he notes that this scenario may be very attractive to the technically adept user, Zimmerer acknowledges that the vast majority of users derive benefit from an intelligent network where the end-points are "dumb," such as today's PSTN and our POTS phones.
31, 2006, Keynote found that overall reliability among the various competing VoIP providers had improved across the board and that the leading digital cable providers had in fact outperformed PSTN in overall reliability.
0 MOS, which is considered to be "toll quality," that is, comparable to the audio quality of a toll call over PSTN.
Quintum's product line offers a wide range of unique features that differentiate it from other VoIP solutions including real time PSTN failover that eliminates risk from poor IP Quality of Service, MultiPath call routing allowing easy installation into existing data and telecom environments, and transparent communication across NAT firewalls.
PSTNConnect SIP not only provides Aptela with a more reliable way to connect those businesses to the PSTN, it enables Aptela to connect users to Broadwing's entire local footprint over a single IP interconnect.
Telephones that can display caller ID are automatically enhanced to display Skype user name, as well as PSTN caller identification(1).
CAMBRIDGE, England -- The financial impact of naked digital subscriber line (NDSL) - DSL broadband without a compulsory PSTN voice service subscription - on incumbent telcos is likely to be small, according to a new report, Naked DSL: challenges and opportunities published by Analysys, the global advisers on telecoms, IT and media (http://research.