Wavecom W61PC V7.5.0 - Manual (Page 242)

232  Transmission Modes WAVECOM Decoder W61PC/LAN Manual V7.5
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.
If no PDUs are selected – this is the default setting - only the status messages generated by
the CMCE protocol will be displayed.
Path The paths for saving output data may be selected here. Use Server to set the Windows
folder for the output files on the server. Use Client to set the Windows folder for the output
files on the client. This option is only enabled on a remote GUI.
Options Check this box if you want to save encrypted traffic for further analysis.
Encryption Encrypted data and voice poses specific problems for decoding as decryption of the payload
is not attempted. TETRA offers air interface encryption which may cover data, signaling,