The X.445 is an
ITU-T
The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU). It is responsible for coordinating standards for telecommunications and Information Commu ...
standard for sending
X.400
X.400 is a suite of ITU-T Recommendations that defines the ITU-T Message Handling System (MHS).
At one time, the designers of X.400 were expecting it to be the predominant form of email, but this role has been taken by the SMTP-based Internet e-m ...
traffic over standard
telephone line
A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. It is designed to reproduce speech of a quality that is understandable. It is the physical wire or oth ...
s, a method known commonly as
dial-up
Dial-up Internet access is a form of Internet access that uses the facilities of the public switched telephone network (PSTN) to establish a connection to an Internet service provider (ISP) by dialing a telephone number on a conventional telepho ...
. It is also known as the ''Asynchronous Protocol Specification'' (APS).
[https://www.pcmag.com/encyclopedia_term/0,1237,t=X445&i=54961,00.asp ]
See also
*
ITU-T
The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU). It is responsible for coordinating standards for telecommunications and Information Commu ...
, a list of current ITU-T standards
References
ITU-T recommendations
ITU-T X Series Recommendations
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