The SAT-B system carries digital voice, low and high speed data and telex. The forward direction channels from land earth stations (LES or CES) to mobile earth stations (SES or MES) are 6 kBaud, 12 kBaud and 65.1 kBaud TDM or SCPC depending on service.
|
Parameter |
Value |
|
Frequency range |
L-Band/C-Band |
|
Operation modes, symbol rate, modulation |
Inm-B (Forward NCS and LES Msg Chnl) Forward: 6 kbps DPSK, NCS TDM, LES TDM 24 kbps OQPSK, CES Voice, CES Low Speed Data 132 kbps OQPSK, CES High Speed Data Return: 24 kbps OQPSK, Aloha, TDMA, SCPC |
|
Required SNR |
>15 dB (20 dB recommended) |
|
Input format(s) |
IF |
In idle mode all mobile stations listen to the NCS (Network Control Station) common TDM channel, which carries signaling information. When a mobile station identifies its id in a signaling frame it will act on the commands received from the NCS and in case of a channel assignment message being received tune to the assigned transmit-receive frequency pair. The forward telex traffic channel (from the LES) is also a TDM with the same frame structure as the NCS TDM.
The return channels are all 12 kBaud Aloha for SES requests, call acknowledgements and registration traffic, TDMA for SES response and telex traffic, and SCPC for SES voice, low and high speed data.
64 kbs is only decoded with W-CODE.
WAVECOM software decodes SAT-B fax with 9.6 kbps and low speed synchronous data with 9.6 kbs. The decoder will automatically adjust to the modulation type in use (BPSK or OQPSK).
All SAT Modes store the monitor information in a result file. The list of all result files is displayed in the lower part of the User Interface. The file names are constructed with the Date/Time and possibly additional information.
Additional information:
See SAT Settings….
See SAT System.