Rf channels, Logical channels – Wavecom W74PC V8.7.0 User Manual
Page 303
WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V8.7.0
SAT System
293
System
Services Offered
Introduction
Max User Data
Rate (fax, data)
mini-C
For the land mobile service, as C, not approved for
GMDSS, compact all-in-one unit housed in the antenna
FleetBroadband
Maritime version of BGAN
SwiftBroadBand
Aeronautical version of BGAN
FleetPhone
Maritime, regional satellite phone
LandPhone
Regional satellite phone, same as FleetPhone
ISatPhone
Global satellite phone service based on GMR-2
2008
Data: 9.6 kbps
RF Channels
Band
Direction
Frequency
L-Band Frequency Range
Receive (Satellite – MES)
1525.0 – 1559.0 MHz
Transmit (MES – Satellite)
1626.5 – 1660.5 MHz.
C-Band Frequency Range
Receive (Satellite – NCS/LES)
3600.0 – 3629.0 MHz
Transmit (NCS/LES – Satellite)
6425.0 – 6454.0 MHz
Logical Channels
The logical channels are described in the table below.
Name
Type
Function
Direction
NCS Common
Control
Network Bulletin Board status infor-
mation
Forward (to MES)
NCS Assignment
Control
Channel assignment
Forward (to MES)
NCS Spot-beam Identification
Control
Spot beam identification for MES
Forward (to MES)
NCS Inter-station
Control
NCS-LES signaling and assignment
Forward (to LES)
NCS Registration Acknowledge-
ment
Control
Registration acknowledgement
Forward (to MES
LES Assignment
Control
Stand-alone or NCS backup assignment
Forward (to MES)
LES Inter-station
Control
LES-NCS signaling
Return (to NCS)
MES Request
Control
Access request channel
Return (to LES,
NCS)
MES Response
Control
Signaling response channel
Return (to NCS)
MES Registration
Control
Initial registration
Return (to LES,
NCS)
MES Call Acknowledgement
Control
Call acknowledgement
Return (to LES)
SCPC channel
User
traffic
Circuit switched
Forward and return
Shared channels
User
traffic
Packet switched
Return
The only frequencies the MES initially knows are the frequencies of the NCSC in all regions - all other fre-
quency information is dynamically extracted from the NCS Bulletin Board or in session oriented signaling
messages. After being switched on, the MES must be told (or remembers) in which region it is currently
located, and will automatically tune to the corresponding frequency of the NCS. The terminal will then
search through the NCSS spot beam ID frequencies to identify the best spot beam.