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Transmission Modes WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V9.1.0
SAT-B
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.
Operation modes, symbol rate, modu-
lation
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
>15 dB (20 dB recommended)
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 traf-
fic, 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 addition-
al information.
Additional information:
See “SAT Settings…” on page 44.
See “SAT System” on page 298.
SAT-B-C-TFC
SAT-B-C-TFC mode is used to monitor the C-band return signal of SAT-B, down converted to an IF of 70
MHz.
>15 dB (20 dB recommended)
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