For government agencies that require secure and reliable satellite communications
our investment in the SIWF (Secure Inter-working Function) protocol ensures a high level
of service. Our SIWF protocol supports a broad range of encryption devices including
STU-III/IIB for Inmarsat-B, -M and mini-M, thus providing voice, fax and data encryption
capabilities on a global basis. And there is no additional charge for encrypted
Inmarsat-B at 9.6 kbps and Inmarsat-M at 4.8
Stratos is the only Inmarsat service provider to offer secure voice, fax and data services
at these rates. Secure services are also available on Inmarsat mini-M at 2.4 kbps.
Since our SIWF protocol is available on all Stratos channel units, there is no competition
for access. Other service providers dedicate only a portion of their channel units for
secure traffic, which could lead to traffic congestion.
Stratos SIWF protocol provides for seamless encryption. There is no need for a
secure database at our land earth stations to identify SIWF capable terminals, and not
even our operators can tell when a secure call is in progress.
Our SIWF is a completely transparent software solution. Software pre-loaded in your
terminal and within our channel units at the land earth station (LES) enables the user to
easily access secure services.
Stratos is the only company offering terminal-to-terminal secure capability.
Stratos SIWF is the only protocol capable of supporting other encryption devices.
STU-III and STU-IIB are the most common encryption devices in use by North American and
European governments, but Stratos SIWF protocol can also support other encryption
devices in use around the world.
STU-IIB on Inmarsat-B, -M and mini-M
Stratos is the only Inmarsat service provider to support STU-IIB on Inmarsat-B, -M and