Introduction to Tandem X.25 Capabilities

3 X25AM Implementations
065307 Tandem Computers Incorporated 3–1
This section describes some implementations of X25AM that have been used or are
being used by Tandem customers. Each implementation description includes an
illustration of the network configuration.
Electronic Mail
Messaging
Using X.400 over
X25AM
The world’s largest value-added network connects to over 100 public data networks,
and offers users a wide variety of dial-up and dedicated-access services based on
Tandem X25AM. One of the network’s most popular services is an electronic mail
messaging service. The messaging service has over 350,000 electronic mailboxes in the
United States. Using X.400 over X25AM (OSI/MHS), the network also connects to
more than one million mailboxes on other public and private systems.
More than 20 PTT administrations overseas and several Regional Bell Operating
Companies in the United States have adopted this electronic mail messaging system
because of its outstanding reliability and functionality, including the transmission of:
spreadsheets
word-processing files
graphics files
news stories on selected topics
The network services also include a store-and-forward dedicated global fax network,
featuring graphics transfer and broadcast distribution.