Wavecom W74PC User Manual

WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V9.1.0 Transmission Modes
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SAT-AERO-P, SAT-AERO-R, SAT-AERO-T
The SAT-AERO system carries digital voice, fax and low speed data. The channels between aeronautical
Ground Earth Stations (GES) and Aircraft Earth Stations (AES) are A-BPSK or A-QPSK modulated with
600, 1200, 4800, 8400,10,500 and 21,500 bps.
Parameter
Value
Frequency range
L-band/C-band
Operation modes, symbol rate,
modulation
Inm-Aero (Forward Pd and Psmc logical channels)
Forward:
- P-channel packet switched data TDM: 600 bps, 1200 bps A-BPSK
(SDPSK), 10.5 kbps A-QPSK (OQPSK), convolutional FEC R = ½, k = 7
- C-channel circuit mode SCPC: 8.4 kbps A-QPSK (OQPSK), convolution-
al FEC R = 2/3, k = 7, 10.5 kbps A-QPSK (OQPSK), convolutional FEC
R = ½, k = 7
Return:
- R-channel slotted Aloha: 600 bps, 1200 bps A-BPSK (SDPSK), 4.8
kbps, 10.5 kbps A-QPSK (OQPSK), convolutional FEC R = ½, k = 7
- T-channel TDMA: 600 bps, 1200 bps A-BPSK (SDPSK), 10.5 kbps A-
QPSK (OQPSK), convolutional FEC R = ½, k = 7
- C-channel circuit mode SCPC: 8.4 kbps A-QPSK (OQPSK), convolution-
al FEC R = 2/3, k = 7, 10.5 kbps A-QPSK (OQPSK), convolutional FEC
R = ½, k = 7
Modulation
A-BPSK (Aviation-BPSK), symmetrical, differential PSK (SDPSK)
A-QPSK (Aviation-QPSK), a variant of offset QPSK
Required SNR
>15 dB (20 dB recommended)
Input
IF
Four channel types are used: P(acket switched), R(andom), T(DMA) and C(ircuit switched).
Two output formats may be selected, All Signaling Units or Messages Only. If All Signaling Units is
selected, all signaling units are shown in hexadecimal except empty signaling units, which are skipped. If
Messages Only is selected, packet-mode user data is converted to readable text.
To interpret decoded ACARS messages following options are available:
Reassemble multipart ACARS messages
This setting enables the reassembling of long messages which are sent in several parts. Instead of dis-
playing each part separately, the messages are shown as one single message when the last part has been
received. The message header is still displayed separately for each part.
Parse ADS-C messages
This setting enables the parsing of ADS-C messages (Automatic Dependent Surveillance - Contact). When
an ADS-C message is received, it is decoded and the additional information is displayed in the output win-
dow.
AERO frequencies are in the range between 1545 MHz and 1547 MHz on the L-band and between 3685
MHz and 3687 MHz on the C-band. DPSK P channels with 600 or 1200 bps can be found around 1545
MHz, whereas the faster OQPSK channels with 10500 bps are found around 1546 MHz.
SAT-AERO-C
The SAT-AERO-C mode decodes the circuit switched traffic channels. There are two bit-rates: 8400 bps
and 21000 bps.
In the 8400 bps mode only the raw AMBE data is decoded and saved. Speech decoding is not supported.
In the 21000 bps mode, speech is decoded and saved into .wav files. Live voice is output to the speaker at
the same time. The data files are saved into the DATA-OUTPUT folder.

Wavecom W74PC Specifications

General

Brand	Wavecom
Model	W74PC
Category	Media Converter
Language	English