Secure transmission over satellite phone network
US7761095B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2005 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Sep 20, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2250/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A reach back secure communications terminal includes a modem to satellite interconnect board that captures DTMF tones, demodulates encrypted modem information, and converts both into an ASCII string for presentation to a data port of a satellite phone, allowing out-of-band control of a non-secure satellite system (e.g., AT command control of a data port) by a user on a secure side of an encryption device, by including the ability to interpret control signals and control the satellite system appropriately. A false dial tone is presented to the encryption device, and the data stream coming from the encryption device is monitored for the presence of dual-tone, multi-frequency (DTMF) tones representing control signals, the DTMF tones are converted to ASCII characters, which are in turn received as control signals by the satellite phone, allowing control of the functions of the satellite system directly from the secure side of the encryption device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.