Wavecom W74PC V8.7.0 - Manual (Page 245)

WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V8.7.0 Transmission Modes
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Parameter Value
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 43.
See “ SAT System ” on page 291.
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
Frequency range L-Band/C-Band
Operation modes Inm-mM (Forward NCS and LES Msg Chnl)
Forward:
6 kbps DPSK, NCS TDM
8 kbps OQPSK, LES Voice SCPC, LES Low Speed Data
64 kbps QAM16, High Speed Data SCPC (ISDN)
Return:
3 kbps DPSK, Slotted Aloha, TDMA,
8 kbps OQPSK SCPC
64 kbps QAM16 SCPC (ISDN)
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 return channel is a 2.8 kBaud TDMA 3 kBaud for all service types.
WAVECOM decodes SAT-M 2.4 kbps fax, data as well as 64 kbps ISDN. The decoder will automatically ad-
just to the modulation type in use (BPSK, OQPSK or QAM16).
Additional information:
See “ SAT Settings… ” on page 43.
See “ SAT System ” on page 291.
SAT-MINI-M-C-HSD
This mode is used to monitor the return channel of SAT-MINI-M-HSD transmissions.