Wavecom W74PC V8.7.0 - Manual (Page 263)

WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V8.7.0 Transmission Modes
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The lower pane contains a list of saved calls and SDS messages. By double-clicking a file a call or a mes-
sage is retrieved and displayed or played back.
Tetra Settings…
Various options are available through Options | Tetra Settings…
Display The user may select what is to be displayed by clicking one of the radio buttons.
Signaling The checkboxes allows the user to display all layer 3 PDUs (Protocol Data Units) corre-
sponding to the levels of the TETRA protocol stack (for protocol overview, see the
WAVECOM white paper WP-TETRA or consult the appropriate ETSI documentation).
PDUs from the following protocol entities are available:
Mobile Link Entity (MLE) – Information on neighboring cells and control of cell reselection.
Mobility Management (MM) - Controls various services, e.g., registration and de-
registration, authentication, OTAR (Over-The-Air-Rekeying), mobile station stunning and
group attachment.
Sub-Network Dependent Convergence Protocol (SNDCP) – TETRA specific adaptation proto-
col for IP data.
Circuit Mode Control Entity (CMCE) – Controls all voice and data (SDS).
Call setup, maintenance and tear-down functions.
An excerpt of the display of PDUs, here CMCE and MLE PDUs.
The PDUs in their entirety are not verbally interpreted – only the protocol name and the
name of the PDU in question are displayed, whereas payload data is output as bits. The ex-
ception here are the SNDCP PDUs which are displayed in formatted as well as binary form.
This allows for a better view on the context activation/deactivation as well as packet flow.
An excerpt of a formatted SNDCP PDU.