ESA is pleased to anounce the introduction of the new version 3.1 of SISNeT. This version 3.1 will be available from 31st of May 2006. Users can download the new SISNeT UID version 3.1 from here. Please note that the current SISNeT service will be interrupted on 29th and 30th of May 2006.

New version 3.1 is similar to the test version 3.0 running on port 7778 for more than a year now, allowing a smooth transition to version 3.1.Thanks to this new verion 3.1 of SISNeT, for the first time EGNOS messages from all 3 Geos of EGNOS will be available to the users of SISNeT, at three different ports. Other major change is the introduction of Carriage Return and Line Feed terminating characters in the SISNeT messages. This change has been implemented as a response to the frequent request of SISNeT users. A mechanism to retrieve messages already broadcast is now part of SISNeT version 3.1, allowing dramatically reducing the Time To First Fix (TTFF) to typically 20-30 seconds (this obviously depends on the employed means to connect to the Internet). A new optional parameter has been added to the AUTH command, allowing a combined authentication and quick initialisation of receivers. Finally, new version 3.1 includes a START/STOP mechanism, which avoids having to request SBAS messages one by one, optimising bandwidth usage considerably.

From the 31st of May 2006, the configuration of the ports will be as follows:

Port 7777: PRN 120
Port 7778: PRN 124
Port 7779: PRN 126

The IP Address will remain the same: 131.176.49.142

Note: Although SISNeT will be available for the 3 GEOs, it is currently schedule that only 2 of the EGNOS GEOs (PRN 120 and PRN 126) will be the formal operational GEOs (incl MT 0/2) from mid July 2006. PRN 124 (ESA Artemis) will in principle be used for testing. For an update on the operational GEO please go here.