Wavecom W-CODE User Manual

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Transmission Modes WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V9.1.0
Layer
Constraints
Layer 2
Logical channels:
User plane, traffic channels:
 Circuit mode not supported
Control plane, control channels:
 All channels except Access Assignment Channel (AACH)
Protocol Data Units (PDU):
 Only downlink PDUs supported
Layer 3
At layer 3, control plane PDUs are user selectable
TETRAPOL
TETRAPOL is a digital voice and data system for mobile services and used for public safety and civilian
PMR (Public Mobile Radio). It is defined by the TETRAPOL Forum in a Publicly Available Standard (PAS). It
features end-to-end encryption.
Parameter
Value
Frequency range
VHF and UHF: 70 – 520 MHz
Operation modes
Digital voice and data system
Symbol rate
8 kBd
Modulation
GMSK (BT=0.25)
Receiver settings
BW = 12.5 kHz
Input format(s)
IF
Additional info
Data or voice
Operation modes
Trunked or Direct-Mode
Access method
FDMA
Voice codec
RPCELP
The WAVECOM decoder can detect Data, Voice, Random Access (RACH), Training, High Rate Data, Direct
Mode Emergency Frame and SCH/TI frames with binary outputs. Each frame can be displayed in binary
format with associated confidence(s) as well as a verification of the CRC for the given frame. Both VHF
and UHF version of the PAS is supported. Currently, it supports the interpretation for Data and RACH
frames.
To use the mode set Offset to the center of the received signal. Select the correct polarity with respect to
received signal. The TETRAPOL PAS defines two signal types: Downlink and Uplink. Downlink is transmit-
ted as INV whilst uplink is transmitted as NOR. However some receivers invert the signal at the IF out-
put.
This decoder uses soft-decision for demodulation and decoding to combat various disturbance in the re-
ceived signal. The phase plane (Options -> Show Phase Plane) display visualizes the GMSK symbol before
and after the demodulation.

Wavecom W-CODE Specifications

General

Brand	Wavecom
Model	W-CODE
Category	Media Converter
Language	English