An Overview of the Email-over-radio system (WINLINK 2000)  The Winlink 2000 system is a "star" based network containing 3 mirror image, redundant COMMON MESSAGE SERVERS (CMS), one in San Diego, one in Detroit and one in Perth, Australia. These insure that the system will remain in operation should any chunk of the Internet become inoperative. Each Radio Message Server node (A TELPAC Node) is tied together as would be the ends of a spoke on a wheel with the hubbing being done by the Common Message Servers. Traffic goes in and out between the CMS and the Internet email recipient, and between the end users and the Radio Message Server gateways. 

Because Winlink 2000 uses de facto e-mail 
(IETF RFC 2821) as its format, it provides direct Radio users and Internet users seamless, transparent email with attachments of reasonable size without any additional stress or learning curve. This allows any mobile or portable operation (A PACLINK station) to interface into the Internet e-mail system.
 

Special care is taken to protect the Winlink 2000  system from SPAM content and virus attack, including the use of special software and services expressly applied for this purpose and the developers and system operators apply their best efforts toward eradication of such content.  Each user of the Winlink 2000 system has their own user-driven options for SPAM control, which are provided by the system.

 

 

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The PACLINK/AGW software takes the email message and sends it over the radio link in AX25 format.The TELPAC software takes the email message sent over the Radio link in AX25 format and sends it (in X25 format) via the TCP/IP protocol onto the LAN to the CMS servers for routing. Likewise the TELPAC software sends any reply from the Internet, adressed to the sender (an amateur or an associated tactical email address) and ignores all other emails. This ensures only the User services (allocated by the Amateur License), can legally transmit information over the Amateur radio frequencies.  The AGW software is only for addressing the data Interface.