Wavecom W61PC V7.5.0 - Manual (Page 225)

WAVECOM Decoder W61PC/LAN Manual V7.5 Transmission Modes  215
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 36.
See “ SAT System ” on page 269.
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
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 return channel is a 2.8 kBaud TDMA 3 kBaud for all service types.
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 36.
See “ SAT System ” on page 269.
SI-ARQ
SI-ARQ is a simplex system similar to for example SITOR. SI-ARQ therefore also sounds similar to the
well-known SITOR system. Because data and pause blocks are longer in duration, the perception of a low-
er baud rate is created.
Parameter Value
Frequency range HF
Operation modes Simplex ARQ
Modulation FSK
Symbol rate 96.0, 192.0 and 200.0 Bd
Receiver settings DATA, CW, LSB or USB