Wavecom W-SPECTRA (Automatic Monitoring System) V1.1.0 - Manual (Page 179)

WAVECOM Monitoring System W-SPECTRA, W-SPEED Manual V1.1.0 Transmission Modes
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NAVAREA NAV MET SAR OCEAN REGION
XIV (New Zealand) X X X POR
XV (Chile) X X X AOR-W
XVI (Peru/USA) X X X AOR-W
1. X = Full Service now available.
2. IMO has decided that routine broadcasts of navigational warnings and meteorological forecasts will be
made at scheduled times over a single nominated satellite for each NAVAREA/METAREA unscheduled.
Additional information:
See “ SAT Settings… ” on page 45.
See “ SAT System ” on page 219.
SAT-M
The SAT-M system carries digital voice and low speed data. The forward direction channels from land
earth stations (LES or CES) to mobile earth stations (SES or MES) are 6 kBaud for NCS and LES TDM and
4 kBaud for LES voice and low speed data.
Parameter Value
Frequency range L-Band/C-Band
Operation modes Inm-M (Forward NCS and LES Msg Chnl)
Forward:
6 kbps DPSK, NCS TDM (LES TDM optional)
8 kbps OQPSK, LES Voice , LES Low Speed Data
Return:
3 kbps DPSK, Slotted Aloha, TDMA,
8 kbps OQPSK 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 3 kBaud Slotted Aloha for MES requests, call acknowledgements and registration
traffic, TDMA for MES response and 4 kBaud OQPSK for MES voice and low speed data.
WAVECOM decodes SAT-M 2.4 kbps fax and data. The decoder will automatically adjust to the modulation
type in use (BPSK or OQPSK).
Additional information:
See “ SAT Settings… ” on page 45.
See “ SAT System ” on page 219.
SAT-MINI-M
The SAT-miniM system carries digital voice and low speed data and fax. The forward direction channels
from land earth stations (LES or CES) to mobile earth stations (SES or MES) are 6 kBaud for NCS TDM,
2.8 kBaud for LES voice, low speed data and fax.
Parameter Value